Answer:
A, B and C may be true
Explanation:
The three-dimensional structure (3D) of a protein, also known as tertiary structure, is critical to its function. In general, the 3D protein structure consists of alpha-helix and beta-sheets (secondary structures) associated through disordered coiled-coil regions. Genetic mutations may cause modifications in the 3D protein structure by modifying amino acids that are added to the growing polypeptide chain during the process of translation. In consequence, the relationships among amino acids (i.e., the intermolecular attractive forces that hold them together) may also be altered by these mutations. In general, mutations that generate amino acid changes at the active site of the enzyme will have a deleterious effect, thereby decreasing or inactivating protein function. However, there are situations where a mutation may be beneficial and can eventually increase the rate of reaction of a protein.
I think the correct answer is the second option. The best isotope to be used in dating metamorphic rocks would be potassium-40. It is the most common and is widely appliclable since most of metamorphic rocks have potassium in it. The isotope system used is potassium-argon.
The measures of how thick or thin the atmosphere of a planet does not really signify its temperature. It is the presence of the gas in that atmosphere and its distance from the sun that causes the increase and decreases in its temperature wherein the hottest planet Venus would be the perfect case for this.
Let's go through each of our options.
For A, the rarity of something has no effect on its validity.
For B, the study wouldn't be more valid, as you should only be testing one variable at a time (in the case, the medicine).
For C, nothing in your experiments should ever be random. And if I'm correctly interpreting it, the question means that even patients who aren't sick would be receiving the treatment, which serves no purpose at all.
Therefore, we know that D must be the correct answer, via process of elimination. Smaller sample sizes are not ideal for experiments, as they require a great deal of extrapolation to see more specific results on a larger scale.
Answer:
water pollution is a density independent factor because the more water that gets polluted the less fresh water we have
Explanation:
I used my BIG BRAIN
