Answer:
mutation, recombination, and immigration of genes.
True or False: All the sugar produce during photosynthesis is not immediately used ; some is stored as energy for later use
Answer:
true
Explanation:
PLS HELP
What is the answer pls help.
Answer:
the answer should be b
Explanation:
How do you think that water gets to the other parts of the tree that need it?
Explanation:
Water mostly enters a tree through the roots by osmosis and any dissolved mineral nutrients will travel with it upward through the inner bark's xylem (using capillary action) and into the leaves.
Proteins are constructed from MRNA, so why is it said that information specifying traits of organisms is encoded in DNA?
Answer:
Because the mRNA are produced from DNA.
Explanation:
DNA, which encodes the genetic information needed for the survival and growth of living organisms, is said to be the BLUEPRINT OF LIFE. This is because DNA stores the information for specifying the traits of an organism. Although, according to this question, it is very TRUE that protein molecules are constructed from mRNA, but the mRNA are synthesized from DNA.
The gene, which is found in the DNA molecule, undergoes expression in two ways namely: transcription to mRNA, and translation to amino acid or protein. This protein is responsible for the traits exhibited by organisms. However, the whole process begins with DNA.
What is the powerhouse of the cell?
Answer:
the mitochondria
Explanation:
Lol this is a meme every where
Answer/Explanation:
This process is known as cellular respiration. It is for this reason that mitochondria are often referred to as the powerhouses of the cell. Mitochondria play host to one of the most important processes in your body, called cellular respiration. Taking in glucose and oxygen
why is there a high concentration of digestive enzymes found in the small intestine of animals?
Which of the following would increase both the atomic number and mass number of an atom by one?
A.
Adding one more neuton.
B.
Adding one more proton and electron.
C.
Adding one more proton and neutron.
D.
Adding one more proton, one more neutron, and one more electron.
Answer:
C. Adding one more proton and neutron.
Explanation:
The atomic number is the number of protons in the nucleus of an atom. Atomic mass is the number of protons and neutrons.
The picture on the right shows fraternal twins. How can you account for their differences considering that they are twins? and the picture is twin boy and girl next to each other help i need it now
Answer:
their offsprings
Explanation:
they are form thesame offsprings
!!!!!!PLEASE HELP!!!!!!!
Which row in the chart below contains the words that
best complete this statement?
The largest extant (living) organism on Earth is larger than a blue whale and larger than the giant sequoia (giant redwood) tree. The largest living organism is the honey mushroom (Armillaria mellea).
What is the size of a honey mushroom?
Why does germ (sex) cells undergo meiosis and somatic(body) cells don't?
Which of the following shows an unsaturated fatty acid?
A pine forest has enough food to support one thousand woodpeckers. Which factor could limit the growth of the woodpecker population?
O increase in the annual rainfall
O limited availability of nesting space
O migration of woodpeckers to other regions
O increase in the population of seed-eating birds
Song
Answer:
Limited availability of nesting space.
Explanation:
Consider a species of sparrow that originally lived only in Alaska but recently expanded its range through North America, then Central America, and finally South America. How would you expect heterozygosity for most loci to differ among populations in North America, Central America, and South America
Answer:
North America is the one with the highest heterozygosity frequency for most loci, followed by Central America, and finally, South America with the lowest heterozygosity level.
Explanation:
Some different forces or mechanisms might alter H-W equilibrium and lead to evolution, such as mutation, natural selection, migration, and genetic drift.
In the exposed example, we have a species of sparrow that migrates from Alaska to North America. Migration is unidirectional, which means that the movement occurs in only one direction: from Alaska to North America. We should also consider that the first immigrants colonized the area for the first time, meaning that there was not a receiving population of the same species already established. Finally, we need to consider that Alaska´s environmental conditions are very different from North America´s environmental conditions.
When a species arrives at a new place, it needs to adapt. The establishment and dispersion of the species in the new area depend on previous adaptation. So, when the firsts sparrow individuals arrived in North America, they faced new environmental conditions that acted as selective pressures that drove to the occurrence of mutations. A mutation implicates a stable and inheritable change in the genetic material. A mutation introduces changes, new alleles in the population, variability. But mutation rates are very low and have no evolutive direction, so they need another force to increase or decrease the mutant allelic frequencies. Natural selection benefits new advantageous alleles and transmits them to new generations changing their relative frequencies. So, sparrows arrive in North America, mutated, and natural selection favored the beneficial mutations leading to a better adaptation to the environment. This means that the heterozygosity level in this new recent population is very high.
As animals adapt to the new habitat and have better dispersal genes, they get to disperse even more. So they start new migration south, to Central America and South America. Again, they are moving to new regions with new conditions, and to establish they need to suffer new adaptations. But remember that we are talking about a recent event in time. Probably the animals migrating south are just a few. They have not spent enough time yet in the new area, to adapt to the new environment and to include new genes into their population. What is even more, as they are a small new population moving south, they are more vulnerable to genetic drift events. Genetic drift acts on a population decreasing the variability between individuals, hence, decreasing the heterozygosity. This small population suffers low mutation, has not enough time to establish, and is more vulnerable to genetic drift events. The heterozygosity level is probably inferior to North America´s one.
Comparing the three areas, we could say that North America is the one with the highest heterozygosity frequency, followed by Central America, and finally, South America with the lowest level of heterozygosity.
What role do chromosomes play in genetic variation?
Answer:
Each egg and orgasm contains a different combination of genes. This is because when egg and orgasm cells form, the chromosomes join together and randomly exchange genes between each other before the cell divides.
How does conduction differ from convection?
In conduction, particles remain approximately in place; in convection, fluid particles move from one location to another.
Conduction transfers thermal energy in solids; convection transfers thermal energy in liquids.
Conduction transfers energy by direct contact of particles; convection transfers energy in the form of waves.
Conduction transfers energy by movement of matter; convection transfers energy by direct contact of particles.
Answer:
Explanation:
I think the first one is correct.
The second one is half right (conduction works mostly in solids). The second part is not correct. Convection works mostly in gases.
The third one is wrong about waves. Conduction usually has direct contact of particles.
The last one is not correct. There is no visible movement of matter in conduction. The definition for convection is also incorrect.
Green plants take in oxygen and water, use them to produce food, and give off carbon dioxide.
Answer: True
Explanation: True
What
happens once a neurotransmitter is received by a post synaptic neuron receptors
Answer:
Neurotransmitter binding increases membrane permeability and form a new action potential.
Explanation:
Neurotransmitters are specific lipid-based compounds that are used in the nervous system in chemical signal transduction. They exhibit receptor-specific functions in triggering many regions and physiological responses of the brain and spinal cord or the central nervous system (CNS).
When released into the space between the synapses called the synaptic cleft, they trigger a range of responses. On the postsynaptic cells they briefly bind to chemical receptors. This results in changes to the membrane which increases the cells' permeability to ions like Na+; a new action potential is created.
Crocodiles are adapted to live in their environment. Which adaptations allow a crocodile to hunt land animals effectively without being detected?
A sharp claws and teeth for holding prey under water
B strong jaws so prey cannot escape once it is caught
C long tails to help them move quickly from the water to the land
D eyes positioned on top of the head to see prey while under water
Answer: D
Explanation:
HELPP MEEEE
8.) The nervous system is:
A. a system for supporting the body’s structure.
B. a system for circulating blood throughout the body.
C. a network that carries messages between the brain and the rest of the body.
D. a network of glands that secrete hormones.
_______________________
9.) From the choices below, select the activities for which the nervous system is responsible.
A. digesting food to produce energy
B. quickly moving your hand off of a hot stove
C. feeling pain
D. identifying an odor
_______________________
10.) Glial cells are
A. cells that support neurons.
B. cells that produce sweat.
C. cells that transmit messages.
D. cells that sometimes attack the nervous system.
_______________________
11.) What are the characteristics of the central nervous system? Select all that apply.
A. It is made up of the brain and spinal cord.
B. It is a system of bones that supports the body.
C. It uses the spinal cord as a pathway to transmit messages to the PNS.
D. It contains networks of nerves called plexuses.
_______________________
Answer: C
Explanation:
Tthe nervous system is a highly complex part of an animal that coordinates its actions and sensory information by transmitting signals to and from different parts of its body.
the diagram shows a helium atom
name part A
Answer:
Name of part A is Nucleus
How does the lac operon help E. coli conserve energy and other resources?
Answer:
A lac operon is a group of three genes that are always transcribed together which code proteins needed for the metabolism of lactose. ... This way of transcription control preserves the energy of E. coli, so proteins that these bacteria need in presence of lactose aren't synthesized when this molecule is absent.
Please answer this question for brainiest !!
DNA sometimes has chemical groups attached, called methyl groups, that affect gene expression. Suppose that, during each hour, first a fraction m of unmethylated locations on the DNA become methylated, and then a fraction u of methylated locations become unmethylated. Find a recursion for the fraction f of the DNA molecule that is methylated.
Answer:
f = m - u
Explanation:
DNA methylation is an important epigenetic modification associated with the regulation of gene expression. As such, the analysis of DNA methylation marks and the dynamics of this process may shed light on the genes that are being expressed at a given time in a given cell type/tissue. In the example above described, f is defined as the fraction of the DNA molecule that is methylated after one (1) hour, whose value can be estimated by subtracting u fraction (i.e., fraction of methylated locations that become unmethylated) from m fraction (i.e., fraction of unmethylated locations that become methylated).
In consequence, the equation is
f = m - u
Which correctly describes cytokinesis and the phase it occurs in the cell cycle?
A. It is the process in which DNA is replicated to make two copies, and it occurs in the interphase of the
cell cycle.
B. It is the process in which DNA is replicated to make two copies, and it occurs in the mitotic phase of
the cell cycle.
c. It is the process in which the cytoplasm of a cell divides to make two daughter cells, and it occurs in
the interphase of the cell cycle.
D. It is the process in which the cytoplasm of a cell divides to make two daughter cells, and it occurs in
the mitotic phase of the cell cycle.
Answer:
D
Explanation:
Cytokinesis occurs after telophase in the cycle. During cytokinesis a contractile ring forms around the cell membrane splitting the cell into two separate cells which each contain a full set of DNA
How is the Mid-Ocean Ridge related to the age of the oceanic crust?
Answer:
The age, density, and thickness of oceanic crust increase with distance from the mid-ocean ridge. Eventually, older oceanic crust encounters a tectonic boundary with continental crust. How to form magnetic striping: new oceanic crust forms continuously at the mid-ocean ridges The two parts of the oceanic plate are pulled apart, and magnetic stripes become older as they move away from the mid-ocean ridge.
Explanation:
Identify which layer of the integumentary system each of the following is most likely to be found and provide a one phrase description of each (3pts): Phagocytic cells Keratinocytes Arrector pili Papillae responsible for fingerprints Melanocytes Paccinian corpuscles
Answer:
The integumentary system comprises the skin, nails, hair and exocrine glands. The average persons skin weighs a approximately 9Kilograms and spans about 20 square feet.
Phagocytic cells: These are found in the dermis or hypodermis. The skin layer that lies directly beneath the epidermis and above the subcutaneous layer is the dermis. It is made up of fibrous and flexible tissue and is the thickest layer of the skin. It thus gives the skin power and flexibility.
Phagocytic cells are cells within the skin that are designed for detecting, engulfing, and destroying pathogens (such as bacteria and other harmful organisms) and apoptotic cells. Apoptotic cells are cells in the human body that have spent their lifespan and are ready for replacement.
Keratinocytes: This is the most common type of cell in the human skin. It is mostly found on the Epidermis and comprises about 95% of the same.
The Epidermis is the most visible part of the skin. It is the part of the skin which the eyes can see. Its function is mostly protective. It receives all nutrition from the dermis because it does not contain any blood vessels.
Arrector Pili Muscle: Beneath the skin, there are tiny muscles that are attached to the base of a hair follicle at one end and to dermal tissue on the other end. These are known as the Arrector Pili.
Papillae: The dermal papillae comprise a little amount of the dermis. They project out of the epidermis. They aren't always immediately visible on the surface of the skin but tend to be quite obvious when examined under a microscope.
Melanocytes: These are neural crest-derived melanin-producing cells. They are mostly found in the lower layer of the skin's epidermis (also known as the stratum basale), the middle layer of the eye (uvea), the inner ear, the vaginal epithelium, the meninges, the bones, and the core. A black pigment mainly responsible for skin color is melanin.
Paccinian corpuscles: can always be seen in the deep part of the dermis of both glabrous and hairy skin. Structurally, they are very much like the Meissner's corpuscles.
Paccinian corpuscles can be found in the Periosteum of the bone, capsules of the joints, pancreas, other internal organs, breast, and genitalia.
Cheers
MASTERY CONNECT MITOSIS
Answer:
The answer is B, y-z-w-x.
Identify and describe the 3 types of barriers the skin forms:
a.
b.
c
Answer:
Maintaining the balance of fluids in the body. Binding in moisture when necessary and preventing moisture loss.
Regulating body temperature: it insulates our body, conserves heat in cold conditions and perspires to cool the body down when it gets hot.
Sensing pressure and pain: absorbing shock and alerting us to danger.
Guarding the whole body from external aggressors.
Explanation:
