1. How is mitochondrial DNA different in shape from nuclear DNA ?
2. From which parent is mitochondrial DNA inherited?
3. How was DNA science used to prove the identity of skeletal remains from the Yekaterinburg?
4. What did the comparison of mitochondrial DNA sequences show?

1. Nuclear DNA is linear in shape while mitochondrial DNA is circular in shape. Nuclear DNA is longer as compared to the mitochondrial DNA which is shorter.

2. Mitochondrial DNA is always inherited from the mother because she provides the cytoplasm of the zygote, which contains the mitochondria.

3. / 4. Not enough info provided.

the correct answer is:

a population changes in response to a change in the environment.

hey, i believe your answer would be d. sugar ribose and the base uracil. i believe this is the answer, because rna consists of sugar ribose, adenine, guanine, cytosine, and uracil.

your first option is incorrect, because that's dna. where it consists of sugar deoxyribose, adenine, guanine, cytosine and thymine.

your second option is also incorrect, this is because sugar deoxyribose is in dna, and uracil is in rna. these two do not make sense together.

your third option being incorrect, because sugar ribose is in rna, but not the base of thymine. rna consists of uracil, not thymine.

lastly your fourth option being correct! this answer is correct, because both sugar ribose, and the base uracil are in rna! ~

answer is d. sugar ribose and the base uracil.