Seals, Tuna, and Penguins share several broad anatomical features. This is because
A) they have all been subjected to similar natural selection, since they live in similar environments
B) they are all reptiles
C) they are all descended from fish
D) they are all closely related to a common ancestor that lived in the ocean
Answer: A) they have all been subjected to similar natural selections, since they live in similar environments
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Biology
- The osmoregulatory/excretory system of a freshwater flatworm is based on the operation of _____.
- Materials are returned to the blood from the filtrate by which of the following processes?
- Excretory organs known as Malpighian tubules are present in _____.
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- The end product of thymine degradation is _______.
- All of the following are directly involved in protein turnover except _______.
- Components of the transulfuration pathway include all of the following except _____.
- Homogentisate is an intermediate in the degradation of __________.
- Amino acids whose degradation yields a-ketoglutarate include all of the following except _________.
- Amino acids whose degradation yields succinyl-CoA includes all of the following except ________.
- Which of the following reactions require SAM?
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- Amino acids whose degradation yields acetyl-CoA include all of the following except ________.
- All of the following are referred to collectively as the branched chain amino acids except _________.
- The fixation of nitrogen requires _______.
- Asparagine is formed from aspartic acid and _________ .
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- All of the following are directly involved in the synthesis of deoxyribonucleic acid except _______.
- One-carbon carriers in metabolism include
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- Chorismate is a precursor in the synthesis of all of the following except _______.
- SAM is a methyl donor in the synthesis of ______.
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- All of the following are purine bases except _____.