difficulty in transporting hormones and waste products
Sally won the 200 m race in 39 seconds. How fast was she going?
speed = distance/ time
Sally's speed = 200m / 39 s = 5.13 ms^-1
explain how the visible external features of a green dicotyledonous leaf aid the process of photosynthesis
Answer:
Plants take in carbon dioxide (CO2) from the air through the stomata, or pores in leaves.
Explanation:
Plants take in carbon dioxide (CO2) from the air through the stomata, or pores in leaves. Chlorophyll is found in the chloroplasts of cells and absorb the sunlight energy needed to change water and carbon dioxide into glucose.
Plants take in carbon dioxide (CO2) from the air through the stomata, or pores in leaves.
What are the characteristics of leaves?A complete leaf has: blade (blade), petiole or sheath, and a pair of leaf appendages called stipules at the base of the petiole. The sheath is the terminal portion of the petiole that embraces the stem and is generally well developed as in the case of Poaceae.
Plants take in carbon dioxide (CO2) from the air through the stomata, or pores in leaves.
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Based on arrow movement, why is the front shown in item A different from the front shown in item B? Warm air rises above cold air in item A, while two air masses collide in item B. Cold air mixes with warm air in item A, while two air masses barely move in item B. Warm air is pushed upward near cold air in item A, while a boundary forms in item B. Two air masses form a boundary in item A, while warm air rises above cold air in item B.
Answer: d. Two air masses form a boundary...
Explanation:
edge
Answer:d
Explanation:
Pepsin is an enzyme produced in the stomach. Pepsin has an optimum pH that is very acidic, between a pH of 1.0 and 2.0. In an experiment involving the enzyme pepsin, the pH is raised from 2 to 11. What will be the MOST LIKELY effect of this on the reaction?
A) The enzyme will denature, stopping the reaction
B) The activation energy of the reaction would be reduced
C) The rate of reaction will reduce due to a decrease in the kinetic energy of the molecules
D) The rate of reaction will increase due to the increased number of collisions of the enzyme and substrate
Which evidence supports the hypothesis that four-limbed animals came from fish?.
Answer:
Which evidence supports the hypothesis that four-limbed animals came from fish? -DNA analysis shows that fish are tetrapods' closest relatives. -The fossil record shows more and more tetrapod-like fish before the appearance of tetrapods about 365 million years ago.
Most fish have flat heads. However, it's crucial to remember that the earliest known tetrapods, Acanthostega and Ichthyostega, had flat heads. The discovery of a fish with a flat head was a strong cue that this fossil was a part of the gradual transition from fish to tetrapods.
What evidence supports four-limb animals came from fish?The appearance of tetrapods about 365 million years ago, the fossil record records fish that were similar to tetrapods. Human embryos have gill slits, while fish and animals with four legs have embryos that are comparable to those of fish.
Ancient animal fossils have revealed how prehistoric life emerged from the ocean and made its clumsy initial steps toward the development of four-legged land animals.
Therefore, Fish were the closest relatives of tetrapods, according to DNA study. Before tetrapods appeared about 365 million years ago, the fossil record reveals an increasing number of fish with tetrapod-like characteristics.
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The medical term meaning sudden spasmodic closure of the larynx is.
Answer:
laryngospasm.
Explanation:
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Science and technology can be utilized to help with many of the problems facing the world today. For example, issues with the availability of food and access to clean water in developing countries can be addressed with science. Which of these proposed solutions would yield the greatest impact for these developing nations?
A) charitable donations of money with no training
B) encouraging local citizens to move away from their country
C) offer tax breaks to citizens for utilizing technology in their homes
D) increase the availability of science and technology training in schools
Answer: i would say the answer is D
Explanation:
D. It is the best way to spread knowledge of science.
Label each item as a description of a haploid or a diploid cell.
——— is described 2n
——— is described as n
——— has single chromosomes each from one parent
———— somatic cell
———- makes fertilization possible
———— results from meiosis
————— fertilized zygote
Answer:
In image :)
Explanation:
What is the difference between canola oil and vegetable oil.
Answer:
Canola is more healthier because it's lowered in saturated fat compared to vegetable oil. Vegetable oil is also blended in a mild flavor.
Explanation:
Explanation: the difference between the two is saturated fat.
Canola oil has 7% fat and 63% monounsaturated fat
vegetable oil has varies based on composition of oil
Canola is used for stir-frying, deep frying
Vegetable oil is used for HIGH heat frying and can substitute as butter or margarine
in the equation e=mc^2, m represents
Answer:
which E represents units of energy, m represents units of mass, and c2 is the speed of light squared, or multiplied by itself.
Explanation:
M stands for Mass.
Carbon can enter the environment when oganisms die and ?
Answer:
Volcanoes erupt, fossis fuels are burned, fires blazed.
Explanation:
Which is the best example for genetic diversity?
A. Humans that have different colored hair.
B. A species of bird that eats berries from trees in one area, but eats them off the ground in another area.
C. Fish that eat tadpoles in the pond, but eat small fish in the lake.
D. A species of snake that sleeps in the trees in the forest, but sleeps underground in the desert.
colorsAnswer:
A
Explanation:
We get our hair color from genes and there is a wide variety of hair colors for us :)
a
What would coffee, at a pH of 4, be
considered?
A. a buffer
B. acidic
C. basic
D. neutral
Answer:
its b
Explanation:
Try a few examples to verify that the doubling time is indeed 7 days. Day 0: plants Day 7: plants Did the water lilies double? Day 10: plants Day 17: plants Did the water lilies double?.
Doubling time is the time taken by the plants, bacteria or animals to raise or double its population. Yes, the doubling time is indeed seven days.
What is the doubling rate?Doubling time is the rate of the time taken by the bacteria or plant to double its population from the given number. On day 1, the population of the water lilies were 2 and on day 7, it was found to be 4. This depicts that the population got doubled in seven days.
On day 10, it grew to 10 and on day 17 to 20. In the duration of seven days, the population of the water Lilly doubled. From this, it can be said that the population of the plant got doubled.
Thus, the doubling time is seven days.
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Answer:
Day 0: 4
Day 7: 8
Did the water lilies double? Yes
Day 10: 10
Day 17: 22
Did the water lilies double? Approximately
The slider only goes up to day 30, but this pond can hold up to 400 water lilies. Estimate the day that the pond will be full. Day 46
How do we see the pieces of debris from the comet on Earth?
Answer:
Meteor showers
Explanation:
regular intervals as the Earth passes through the trail of dusty debris left by a comet.
What type of star has a high temperature but a low luminosity? Question 2 options: Blue Red Yellow White.
The White Dwarf star has a high temperature but low luminosity.
How does changing the environment that the bacteria are in affect their population
Bacteria respond to environmental changes by expressing or suppressing genes. This affects the organism's inner and surface chemistry.
What are the effects of environment on bacteria?Bacteria are common, largely free-living organisms that frequently only have one biological cell. They make up a vast domain of prokaryotic microbes.
When their environment suddenly changes, bacteria respond by expressing or inhibiting the expression of a vast number of genes. This reaction alters the chemistry of the organism's surface as well as its internal features.
Although bacteria can survive at higher and lower temperatures than humans, they thrive in an environment that is warm, wet, protein-rich, and pH neutral or slightly acidic. However, there are several exceptions. While certain bacteria can survive in environments of extreme heat or cold, acidity or salinity, others can.
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What is the connection between a cell and a organism?
Answer:
Organisms are made up of cells. Tissues become organs, organs become organ systems, and organ systems become organisms. An organism is essentially nothing more than a massive collection of diverse cells that collaborate for two main purposes. The immediate (immediate) purpose for this is to ensure one's survival.
Explanation:
What is the best characterization of a fine grained igneous rock?.
If two plants of the genotypes ttRr and TtRR were crossed, what would be the probability that they would produce a dwarf white plant
tall plant with red flower is crossed to dwarf plant with white flowers In the next generation tall plant with red flowers are 25%, tall plant with white flowers are 25%, dwarf plant with red flowers are 25%, dwarf plant with white flowers are 25% are formed
The oxygen side of a water molecule is _____.
Answer: partially negative
Explanation:
You didn't specify much what type answer you were looking for in the blank, so I assumed that you're asking for the charge of the particle.
Where do transcription and translation occur in the cell?.
Answer:
Thus, in eukaryotes, while transcription occurs in the nucleus, translation occurs in the cytoplasm.
Which experimental approach would provide the most information about differences in membrane fluidity between two types of cells?.
Answer:I assume from your question that you are working with actual cells and that making the cell membranes de novo is not an option. Thus your only option (excluding extensive genetic modification of the cells) is pretty much to try to load the outer leaflet of the membrane with cholesterol or saturated, relatively long chain sphingolipids or phospholipids. (Well, easiest would be to decrease temperature, but because temperature affects pretty much every chemical and physical process, it would not tell you much about the specific role of fluidity.) Usually people use beta-cyclodextrins for cholesterol loading and gamma-cyclodextrins for phospho-/sphingolipid loading. In principle lipid exchange proteins would probably be better but with far, far higher cost.There are a few things to keep in mind. First, you need a good control to ensure that it is the change in membrane composition that affects the vesicle formation. Preferably you should also verify the fluidity of the cell membranes. This brings us to our second point to keep in mind. One problem with the cholesterol loading of the membranes is that cholesterol tends to uncouple the fluidity from the lipid chain order, resulting at higher mole fractions with saturated acyl chain rich membrane in fluid but ordered liquid-ordered phase. Otherwise the fluidity (i.e. how easily the lipids diffuse in the membrane) and chain order (i.e. how many kinks the chains tend to have) are more or less coupled, as kinks tend to push the lipid molecules farther apart. So, you will need preferably a few different types of reporter systems on fluidity, e.g. FRAP of a fluorescent lipid, Laurdan GP value, and, ideally some method for monitoring chain order, but this is very hard to do in cells that have very strong background fluorescence at the wavelengths of good chain order reporters like DPH-PC. The third problem is that because of the coupling between the chain order and area occupied by chains the preferred shape of the lipid molecules shifts with temperature from the initial (for unstressed bilayers) cylindrical towards a cone (with the polar headgroup at the peak). In addition, because the cholesterol has a very small headgroup, the increasing mole fraction of cholesterol causes similar effect. Occasionally this is referred to as HII propensity, because an easy way to quantify the effect is to look at the temperature where the system undergoes a phase transition from a (bilayer) L-alpha phase to cylindrical HII phase. If this happens on one leaflet only and if there is nonuniform concentration of the components, it tends to favour invagination and budding of the vesicles. This is something that is pretty much guaranteed to affect the vesicle budding process. Firstly, by reducing the headgroup area and inducing clustering by cleaving sphingomyelin with sphingomyelinase into ceramide it is possible to induce the invagination and vesiculation of the ceramide rich domains in model membranes in the absence of any other protein than sphingomyelinase (see the papers by Holopainen and Kinnunen, Vectorial Budding etc. in Biophys. J., and by Nurminen, Holopainen, and Kinnunen in J. Am. Chem. Soc.). In addition, it affects the energetics of the fusion/fission stalk, I think you can find papers on this by Kozlov in Biophys. J. The fourth problem is that the changes in the composition tend to affect the bending rigidity of the membrane that of course affects the energetics of the membrane bending processes like invagination and vesiculation.It is probably easy to see that successful, significant modification of the membrane composition affects the vesicle formation, but it is so complex to try to isolate the effect of fluidity of the vesicle formation that I doubt it can be done convincingly in live cells, at the very least in would need to involve numerous modifications while using sophisticated systems to record their effects on the properties of the membranes, including microdomain formation. Most likely it would require experiments using a full, reconstituted vesicle budding machinery with giant vesicles and accompanied by coarse-grained simulations to isolate the various effects of the modifications. So, to summarize, quick and dirty experiments with cholesterol loading can be done, but they do not tell you much about what property it was that caused the effect observed.
Explanation:
How do earthworms create a moist local environment for gamete fusion?.
Answer:
Earthworms create a moist local environment for gamete fusion by secreting mucous.
Explanation:
What are 5 uses of Protiens?
Answer:
1. Build. Protein is an important building block of bones, muscles, cartilage and skin. In fact, your hair and nails are comprised mostly of protein.
2. Repair. Your body uses it to build and repair tissue.
3. Oxygenate. Red blood cells contain a protein compound that carries oxygen throughout the body. This helps supply your entire body with the nutrients it needs.
4. Digest. About half the dietary protein that you consume each day goes into making enzymes, which aids in digesting food, and making new cells and body chemicals.
5. Regulate. Protein plays an important role in hormone regulation, especially during the transformation and development of cells during puberty.
hope this helps
Answer:
Control the rates of reactions
Form bones and muscles
Regulate cell processes
Fight diseases Transport materials in and out of cells
The cell cycle is:_____.
a. a set of orderly stages that occur between one cell division and the next.
b. a set of orderly stages that occur between cell division and programmed cell death.
c. also called mitosis.
Mikayla is at the garden center picking out plants for her front garden. She sees flowers in many different colors and patterns. Mr. Kim, the shop owner, sees Mikayla examining some camellias. He points out several kinds of flowers and explains how they end up with their color.
Choose the sentence from the passage that describes incomplete dominance.
1. These flowers are red and white because they have one red parent and one white parent.)
2. This is due to both alleles being expressed at the same time.)
3. But these pink flowers also have one red parent and one white parent.
4. Blending of colors occurs from mixing a dominant and recessive allele for an inherited trait.
1, 2 , 3, or 4?
this is due to both allels being expressed at the same time
Which statement describes the process of osmosis in an animal cell?
Explanation:
osmosis, the spontaneous passage or diffusion of water or other solvents through a semipermeable membrane (one that blocks the passage of dissolved substances—i.e., solutes). The process, important in biology, was first thoroughly studied in 1877 by a German plant physiologist, Wilhelm Pfeffer.
Can non renewable sources of energy be sufficient to meet our need? Give reasons for your answer
Answer:
Fossil fuels
Explanation:
Fossil fuels can generate a large amount of electricity at a single location.
They can be found very easily.
They are cost-effective.
Transportation of oil and gas can be done easily through pipelines.
They have become safer over time
Why is nitrogen important to plants? What important biological macromolecules require nitrogen?
Answer:
Nitrogen is important to plants because without nitrogen plants would not be able to make food (photosynthesis).
Nucleic acids (DNA and RNA) are polymers of nucleotides each of which consists of pentose sugar, phosphate molecule, and one nitrogenous base (adenine, guanine, cytosine, uracil, and thymine).
Explanation:
The nitrogen cycle is important biologically because nitrogen is a major constituent of phospholipids, ATP, and other energy-storing molecules, it is a component of amino acids proteins, and nucleic acids, and it forms the framework for organic molecules that are essential to all organisms, and the processes in the mitochondria require major amounts of nitrogen.
What is the Nitrogen cycle?The nitrogen cycle may be defined as a type of biogeochemical cycle through which nitrogen and its derivatives move through both living and non-living things within the entire atmosphere. It involves the series of processes through which nitrogen and its compounds are interconverted in the environment.
The nitrogen cycle is not important biologically because the atmosphere is composed of 78% nitrogen; therefore nitrogen is freely available to all living organisms, regardless of where it is in its cycle.
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