Answer is A. The positively charged R group of a basic a.a could bind to DNA.
Basic amino acids have a positive charge and acidic amino acids have a negative charge. DNA also has negative charge because of the phosphate group in nucleotides. So they have opposite charges and can form ionic bonds.
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Answer:
D. The mammoth became extinct because mammoth physiology changed with the climate.
Explanation:
"ecology of the area developed into extensive forests of birch and conifers" and "not favorable for the mammoth and was difficult to digest." Infers that the mammoth became extinct due to its digestive system rejecting the food that the area provided. It's digestive system required different foods, thus starving them into extinction.
D, A, C is the answer I believe in
The one molecule is cis and the other is a trans firm.
Answer: Carbohydrates.
Explanation:
If you eat chicken cooked with butter continuously for a long period of time you would end up starving your cells of carbohydrates. As the butter would give you lipids which is a form of fatty acid and vitamins, the chicken would be a source of protein to your cells.