Platyhelminthes present a body that can be divided into two, drawing a line from the head to the tail right in the middle of it, as the following image shows:
how does a mass extinction event affect biodiversity on the earth? choose one: a. mass extinctions of minimal effect on the diversity of life. b. mass extinctions increase the diversity of life. c. mass extinctions decrease the diversity of life. d. mass extinctions have no effect on the diversity of life.
A mass extinction event affects biodiversity on the earth as during the time of extinction there is a rapid decrease in the diversity of life.
At a basic level, mass extinctions reduce diversity by killing specific lineages, and along with them, any descendant species they might have given rise to.
But mass extinction can also play a pioneering role in evolution, sparking the growth of other branches. Mass extinctions, by removing so many species from their ecosystems in a short time, reduce competition for resources and leave behind many uninhabited niches, which sustaining lineages can evolve into.
In the past half-billion years, Earth has been hit again and again by mass extinctions, eradicating most species on the planet. These events were devastating.
But life bounced back and the recovery was speedy.
The marking of recovery and diversification happened after every mass extinction.
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3. can you think of any similarities between whales and the oil plumes where the oceanospirillales bacteria were found? (hint: why were whales once hunted in great numbers? what was their fat used for?) why might oceanospirillales bacteria be symbionts of osedax? 8pts
At 1,017 m or Osedax Monterey Bay sp. 3 "rosy" Osedax sp. MB3 and 381 m (Osedax Monterey Bay sp. 4 "yellow collar") depths, we looked into the genetic diversity of symbiotic bacteria associated with two newly discovered species of Osedax from Monterey Canyon, California.
Comparing adult Osedax frank press and juvenile Osedax frank press that had recently colonized whalebones implanted at 2,891 m allowed for the identification of differences in the compositions and abundances of the bacteria associated with the newly discovered host species through the use of quantitative PCR and clone libraries of 16S rRNA gene sequences.
Oceanospirillales symbionts connected to Gammaproteobacteria associated with the previously described O. frank press and Osedax rubiplumus were present in the newly discovered Osedax species.
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when the membrane potential become more positive, changing for example from -70 mv to -50 mv, this is called . question 22 options: hyperpolarization nonpolarization depolarization repolarization
When the membrane potential becomes more positive, this is called depolarization.
When a stimulus reaches a resting neuron, depolarization happens. The gated sodium ion channels on the neuron's membrane suddenly open during the depolarization phase, allowing sodium ions (Na+) from outside the membrane to flood the cell.
What are the stages of nerve impulse transmission?
The action potential has three stages: depolarization, repolarization, and recovery. It moves swiftly down the neuron's axon as an electric current. At an electrical or chemical synapse, a nerve impulse is sent from one cell to another.
Therefore, when the membrane potential becomes more positive, this is called depolarization.
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What happens during radioactive decay?
answer: Parent isotopes turn into daughter isotopes
Answer: I hope this helps. Let know if this right or wrong. Have a good day
Explanation:
When radioactive atoms decay, they release energy in the form of ionizing radiation (alpha particles, beta particles and/or gamma rays). The energy is called ionizing radiation because it has enough energy to knock tightly bound electrons from an atom's orbit. This causes the atom to become a charged ion.During radioactive decay, an unstable nucleus emits subatomic particles to attain stability. It may undergo transmutation to change to some other nucleus or may achieve a stable state by giving off energy in the form of photons. Radioactive decaya radioactive process in which a nucleus undergoes spontaneous transformation into one or more different nuclei and simultaneously emits radiation, loses electrons, or undergoes fission.
arthropod exoskeletons and mollusk shells both . help to retain moisture in terrestrial environments. completely replace the hydrostatic skeleton found in annelids. are secreted by the mantle. are comprised of the polysaccharide molecule chitin.
The correct option is a. help retain moisture in terrestrial environments.
Both arthropods and mollusks have robust chitinous exoskeletons. High levels of calcium carbonate minerals also contribute to the mollusc exoskeleton's rigidity. Arthropods' exoskeletons do not develop along with the rest of the animal, in contrast to mollusk shells.
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Which phrase describes a feature of the cell wall that allows materials to enter and exit the cell?
Answer:
c
Explanation:
The holes in the cell wall allow materials to enter and exit the cell. Therefore, option C is correct.
A cell wall is a rigid outer layer found in some cells, primarily in plant cells, fungi, algae, and certain bacteria. It is located outside the cell membrane and provides structural support, protection, and shape to the cell.
The composition of the cell wall varies depending on the organism. In plant cells, the primary component of the cell wall is cellulose, a complex carbohydrate. Other components such as hemicelluloses, pectins, and lignin may also be present. These components give the cell wall its strength and rigidity.
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If the distance between Earth and the sun were doubled what would be the force of gravity between them
Phospholipids are found in a limited number of foods. They consists of a glycerol backbone with two fatty acids and a compound that contains phosphate. Why are they important in food and in the body?.
Esters of glycerol, fatty acids, phosphoric acid, and other alcohols make up phospholipids.Phosphatidylcholine, phosphatidylethanolamine, phosphatidylinositol, and phosphatidylserine are the four most prevalent phospholipids.
Where are phospholipids found in food?
The plasma membrane, the top layer of animal cells, is largely made up of phospholipids.They are made up of fatty acid chains joined to a glycerol backbone, just like fats.Phospholipids have two fatty acids that contribute to the formation of a diacylglycerol, as opposed to triglycerides, which have three fatty acidsPhospholipids are amphiphilic lipids consisting of a glycerol backbone or an amino-alcohol sphingosine backbone, which is esterified to one or two fatty acids, a phosphate group and a hydrophilic residue.Good sources of phospholipids include eggs, organ meats, lean meats, fish, shellfish, cereal grains, and oilseeds, particularly the choline phosphatides phosphatidylcholine, sphingomyelin, and lysophosphatidylcholine. Glycerophospholipids and sphingolipids are two kinds of lipids that make up the significant class of membrane lipids known as phospholipids. The cell membrane is composed of phospholipids, which are created when glycerol interacts with two fatty acids and a phosphate group.One phosphorus atom and four oxygen atoms combine to generate the complex ions known as phosphotes.Another form of lipid that does not contain glycerol is steroids. A phospholipid is a molecule made composed of a glycerol backbone, two fatty acids, and a modified phosphate group.The phosphate can change by having polar or charged chemical groups added to it. These hydrophilic and hydrophobic characteristics of phospholipids lead them to group into two layers when cellular membranes are formed.Because they are hydrophobic, the phosphate tails in between the layers of heads avoid contact with the water while the heads in each layer face the aqueous or watery environment on either side. The vital phospholipid fatty acids (PLFA), which degrade quickly after cell death and act as a marker to distinguish between living and dead organisms, are part of the cell membrane of microorganisms.To learn more about Phospholipids refer
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What will happen to the red blood cells in a hypertonic solution?Swelling and eventual crenationShriveling while maintaining the volume of cytoplasm.No net movement or shape change to the cells.© The red blood cells will experience crenation.
In an hypertonic solution, red cells would experiment loss of water, which translates into reduction of the volume of the cytosol, and eventually crenation, which means the destruction of the cell by dehydration (D).
1. identify 10 biotic components of an chosen ecosystem.
Answer:
Explanation:
Biotic factors are living or once-living organisms in the ecosystem. These are
obtained from the biosphere and are capable of reproduction. Examples of
Biotic factors are animals, birds, plants, fungi, and other similar organisms.
Biotic describes a living component of an ecosystem; for example organisms, such as plants and animals.
Examples: All living things — autotrophs and heterotrophs — plants, animals, fungi, bacteria.
Living things that directly or indirectly affect organisms in
environment; organisms, interactions, waste; parasitism, and disease.
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Why is it more dangerous to consume too much of a fat-soluble vitamin than to consume too much of a water-soluble vitamin?.
Answer:
Fat-soluble vitamins are more likely to cause toxicity
Explanation:
Water-soluble vitamins are readily excreted from the body, while fat-soluble vitamins can be stored in tissues. Fat-soluble vitamins are more likely to cause toxicity, although water-soluble vitamins can do so as well.
Brainlist maybe ;)?
Answer:
Water-soluble vitamins are readily excreted from the body, while fat-soluble vitamins can be stored in tissues. Fat-soluble vitamins are more likely to cause toxicity, although water-soluble vitamins can do so as well.
Explanation:
Which exercise is a calisthenic exercise that works the entire body and builds strength in the arms, shoulders, core and legs while working the cardiovascular system?.
Pushups are calisthenic exercise that works on the upper body. legs and core while working with the cardiovascular system.
Calisthenics is a type of strength training that uses gravity and your body's resistance to help you strengthen your muscles and get better at coordination, endurance, and mobility. In point of fact, calisthenics exercises like squats, pushups, lunges, and crunches make up almost all common bodyweight exercises.
Pushups are a popular way to strengthen the upper body and core. A lot of people do pushups as part of their regular exercise routine. Improved cardiovascular health and muscle mass are two of the advantages of doing pushups every day. One form of strength-building exercise is pushups.
Strengthening your upper body with traditional pushups is beneficial. They work the shoulders, triceps, and pectoral muscles. By engaging (pulling in) the abdominal muscles, they can also strengthen the lower back and core when done correctly. Pushups are a quick and efficient strength-building exercise. They don't require any equipment and can be done almost anywhere.
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what would a man made biosphere built by you look like? how would it work?
A biosphere built by me will have the presence of plants, animals, microbes and other resources which are beneficial to the ecosystem.
What is a Biosphere?This is referred to as the portion of the earth which is characterized by the presence of different types of life forms.
A good biosphere must have a constant food supply which is ideal for the growth and survival of the organism. It is best to have plants as they are the primary producers and provide food to other animals. Microbes help in decomposition and other processes and will ensure they are present so as to reduce pollution.
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which single use container uses up the fewest resources from the enviorement
Answer:
Paper cupExplanation:
Paper cup is made from pulp which is obtained from wood.
Paper is usually very light with a low durability
it decomposes much more quickly than plastic and glass.
and it is less likely to be a source of pollution and don’t really pose a risk to wildlife.
Therefore, paper cups arere single use cups uses up the fewest resources from the environment. A paper cup uses up the most resources from the environment if used just once. HOPE THIS HELPS!
After doing a body check-up, Sam found out he had an extremely low level of trypsinogen. Discuss what will happen after Sam eat a meal high in protein and fat.
(Your answer should mention location of secretion, location of activation, negative consequence if the enzyme does not function properly.)
If Sam had an extremely low level of trypsinogen, then he couldn't break down proteins from foods into their basic subunits, while fats were normally metabolized.
What is trypsinogen?Trypsinogen is a precursor of the trypsin enzyme which is used by the body to degrade proteins into their amino acids. All proteins are composed of amino acids, which represent the building blocks of these biomolecules.
Therefore, with this data, we can see that trypsinogen is fundamental to degrading proteins onto their subunits (i.e., their amino acids), thereby the absence of normal levels of this precursor enzyme would be dangerous for the health of the organism.
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which of the following statements is true about epigenetics
if the bacteria are not spread evenly around the plate and some parts do not have growth because they have not been inoculated with test bacteria, how will this affect the results of the experiment?
ln case the question regarding the spread plate method.
The spread plate technique is a laboratory technique that can be used to isolate and count the total number of microorganisms in a mixed culture. and distributing it evenly. In case when the bacteria are not spread evenly around the plate and some parts do not have growth as they have not been inoculated with test bacteria, this will affect the quantification of bacterial species in a solution and may result in uneven growth on a plate and ultimately infers false results.
What is bacteria?
Bacteria are common, largely free-living organisms that frequently only have one biological cell. They make up a significant portion of the prokaryotic microbial kingdom. Bacteria, which are typically a few micrometers in length and were among the first life forms to emerge on Earth, are found in the majority of its habitats.
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which organisms do not use nadh to feed electrons into mitochondrial electron transport chains? group of answer choices animals that do not maintain a constant body temperature plants animals that maintain a constant body temperature eukaryotic algae bacteria and archaea
The statement "animals that do not maintain a constant body temperature" is correct, they are the organisms that do not use NADH to feed electrons into mitochondrial electron transport chains.
Animals that do not keep a constant body temperature do not need NADH and do not consume NADH during respiration, as NADH is needed for maintaining a constant body temperature and is thus required by the organism.
The second method uses the respiration process used by bacteria and archaea, which uses NADH. The eukaryotic algae in the third option employ NADH in respiration since eukaryotes often do so. In the fourth option, animals must use NADH for respiration in order to keep their body temperatures constant.
If NADH is not available, oxidative phosphorylation reactions uncouple, which maintains the body temperature. This type of reaction is seen in animals that are hibernating as well as in newborn animals and people.
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Remembering that proteins are made in cells that are 70% water- and water is polar-
describe how you might imagine that a protein spontaneously folds up into a complex 3D
shape.
Answer:
Hydrophobic packing. Read explanation below.
Explanation:
There are 4 tiers of protein struture. Primary structure is the links of amino acids attached by peptide bonds. The N terminus of one bonds to the C terminus of another.
Secondary structure is the first stage of folding. The amino acid chain can hydrogen bond with itself and can form structures such as Alpha helix and Beta sheet.
Tertiary structure is the interaction between R groups. R is a variable used to denote the presence of some type of compound attached to the basic amino acid structure that makes it chemically unique from the other ones.
Quaterary structure is also between the interaction of R groups, however it is between multiple proteins.
Types of folding that occur in Tertirary and Quaternary structure are the formation of disulfide bonds in an oxidizing enviornment, singularly in the presence of cysteines in a polypeptide. There is also hydrophobic packing, which is when a protein is in an aqueous solution the hydrophobic parts will fold inwards so it is not exposed to the water, and the hydrophillic polar regions will gravitate to the outside.
protein folding spontaneously folds up into a complex 3D shape by Hydrophobic packing.
What is protein folding ?
There are four types of protein structure where the Primary structure of protein is the links of amino acids by forming peptide bonds in which the N terminus of one bonds is present at one end and C terminus at another.
Secondary structure of protein is the first stage of protein folding where the amino acid chain form peptide by forming hydrogen bond with itself and form the structures of Alpha helix and Beta sheet.
Tertiary structure of the protein refers to the interaction between R groups where R is a variable group which is used to denote the presence of compound attached to the basic amino acid
Quaternary structure of the protein is formed between the interaction of R groups between multiple proteins.
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If you pinch your nose while you are putting a piece of food into your mouth, what are you going to experience?.
If you pinch your nose while putting food in your mouth, you may experience lack of taste in the food.
It did appear that smell had an impact. However, the ability to taste was not completely impaired by nose plugs. Chewing certain foods allows aromas to reach the nose through the back of the mouth even when the nostrils are closed because the nose and throat share essentially the same airway.
Molecules from your food travel up your throat to the olfactory epithelium, where they activate odor receptors, when you eat.
Retronasal olfaction, as opposed to orthonasal olfaction, which occurs when you sniff through your nose, is prevented by pinching your nose. Retronasal olfaction is very important to your sense of flavor, which many other people mistake for "taste.", we can demonstrate this with jelly beans: you can still taste the sweetness of the jelly bean by pinching your nose, but you can't tell the difference between a strawberry and a grape. One of the most common complaints made by people who have lost their sense of smell is that food no longer "tastes" good because it lacks a lot of flavor.
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(ii) D is a vein. State the name of this vein and describe its structure.?
name description of structure.?
Answer:
Inferior venacava is a D vein
Vein is defined has been defined as the blood vessel that carries blood to the heart from tissues and organs in the body.
What is vein?The arteries, which are three-layered blood vessels, transport oxygen-rich blood from the heart to the body's tissues. The three-layered blood channels known as arteries carry oxygen-rich blood from the heart to the body's tissues.
Collagen and elastic fibres are present in the connective tissues that make up the outer layer, which supports the blood artery. The intermediate layer is composed primarily of elastic fibres, collagen, and smooth muscles.
The flexibility and strength are provided by this layer. The wall may stretch because of its elastic fibres. Because of the smooth epithelial cells that make up the inner endothelium, friction is reduced. In terms of structure, veins and arteries are comparable, with the exception of these three thin and elastic layers.
Therefore, Vein is defined has been defined as the blood vessel that carries blood to the heart from tissues and organs in the body.
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despite its name, kentucky bluegrass is a widespread turfgrass used for lawns throughout the united states. in some regions, strains have developed desirable disease-resistant properties. however, kentucky bluegrass typically develops by apomixis. plant breeders say this creates both a challenge and an opportunity for engineering novel strains. why?
If a seed develops by apomixis, it will be identical to its parent.
In order to hybridize with another strain, specific procedures are needed. However, apomixis assures the reliable multiplication of a hybrid strain once it has been created. A perennial, cool-season lawn grass is what is referred to as Kentucky bluegrass.
This indicates that it returns each year and grows most actively in the chilly months of fall and spring. Asexual reproduction without fertilization is known as apomixis in botany. Greek for "aside from" and "mixing" make up its origins.
Notably, meiosis is not included in this definition. As a result, "natural asexual reproduction" of plants, such as growth from cuttings or leaves, has never been thought of as apomixis; nevertheless, the replacement of the seed by a plantlet or the replacement of the flower by bulbils were both recognized as kinds of apomixis. Offspring born by apomicticism share the same genetic makeup as their parent plant.
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Which two actions are examples of science influencing technology?
Answer:
I think its A and B
Explanation:
which antibiotic specifically inserts on sites of the 30s subunit of prokaryotic ribosomes causing the misreading of mrna and thus inhibit translation?
Streptomycin and neomycin are aminoglycosides that bind to sites on the 30S subunit of prokaryotic ribosomes causing the misreading of mrna and thus inhibit translation.
Streptomycin and spectinomycin are main antibiotics that function by binding to specific sites on prokaryotic rRNA and affecting the dependability of protein synthesis. spectinomycin inhibits bacterial protein synthesis by blocking translocation of messenger RNA and transfer RNAs on the ribosome.
Main aftereffect of aminoglycosides are kidney injury, hearing impairment and vestibular toxicity. aminoglycosides are far-reaching, bactericidal antibiotics that are mainly recommended for children, primarily for infections caused by Gram-negative pathogens.
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I need some help with my science homework.
Answer: Photosynthesis changes carbon dioxide and water into oxygen and glucose, while Cellular respiration does the opposite converting glucose and oxygen into water and Carbon dioxide
Help please
Cells in both organisms exhibit all of the characteristics of life to maintain homeostasis .
Both are made of specialized cells .
Both organisms have the same number of cells.
Cells in both types of organisms can grow to any possible size .
Answer:
It's a has a nucleus (Eukaryotic) It relies on others for food (Heterotrophic) and has no cell wall. Can reproduce sexually and asexually.
which of the following statements about the cytoskeleton is true? the cytoskeleton is produced by transport vesicles of the endomembrane system. chemicals that block the assembly of the cytoskeleton would have little effect on a cell's response to external stimuli. although microtubules are common within a cell, actin filaments are rarely found outside of the nucleus. the cytoskeleton of eukaryotes is a static structure most resembling scaffolding used at construction sites. movement of cilia and flagella is the result of motor proteins causing microtubules to move relative to each other.
The answer is yes this is true, the dynamic aspect of cytoskeletal function is made possible by the assembly and disassembly of a large number of complex proteins into larger aggregates. There are three types of the cytoskeleton: actin filaments (microfilament), microtubules, and intermediate filaments.
What does cytoskeleton mean?All cells, including those of bacteria and archaea, have a complex, dynamic network of interconnecting protein filaments called the cytoskeleton. It stretches from the cell nucleus to the cell membrane in eukaryotes and is made up of identical proteins in different animals.The cytoplasmic protein filament and microtubule network that regulates cell shape, upholds intracellular structure, and participates in cell motility. Examples of Other Words from Cytoskeleton More information on the cytoskeleton.Contractile bundles (found in muscle cells), the MTOC, the nuclear lamina, and the intermediate filament-based 'cage' that forms around the nucleus from flexible cables at the cell surface to the core of the cell are a few examples of higher-order cytoskeleton structures.Hence, the above statement is true.
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What part of the brain is the arrow pointing to in the diagram below?
Occipital lobe
Temporal lobe
Frontal lobe
Parietal lobe
Answer:
the parietal lobe.
it is near the back and top of the head.
this part processes and interprets information about objects in our external environment.
hope it helps..
Answer: D: Parital Lobe
Explanation: I took the test
g which of the following tissues is found in both the stem and the roots of a plant? meristematic tissue vascular tissue all of these tissues are found in both the stem and the roots. dermal tissue ground tissue
The tissues is found in both the stem and the roots of a plant is vascular tissue.
What is vascular tissue, and its function?In higher plants, vascular tissues are intricate conducting tissues made up of several cell and elemental kinds. Xylem and phloem are the two primary elements of plant vascular tissue. These tissues are in charge of moving water and nutrients throughout the plants.
The two primary tissue types that make up the vascular system are xylem and phloem. From the roots to the leaves, the xylem transports water and dissolved minerals up the stem of the plant. From the leaves to the roots, food is transported by phloem.
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Answer: Its all of them
Explanation:
Which part of a cell is the fluid environment where molecules are broken down and new molecules made?
