Characteristics of stem cells include
a) renewing
b) unspecialized
c) can become specialized cells
d) all of the above
Answer: D
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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?
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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 ________.
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- The fixation of nitrogen requires _______.
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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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- SAM is a methyl donor in the synthesis of ______.
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- All of the following are purine bases except _____.