What is the first step in protein catabolism for prokaryotes?
A. Deaminases split amino groups off the proteins.
B. A phosphate group is attached to the protein to make it less stable.
C. Proteins lose ammonia or an ammonium.
D. Proteases split proteins into amino acids.
D. Proteases split proteins into amino acids.
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Which of the following statements concerning cancer and mutations is correct?
A. Cancer can only occur with a mutation in a somatic cell. B. Cancer can only occur with a mutation in a germ cell. C. Usually multiple mutations are required in different genes to cause cancer. D. Usually a single mutation is all that is required to cause cancer. E. None of the answer options is correct.
Blood in the veins looks purplish because ____
a. it contains less oxygen than arterial blood b. most of the oxygen is dissolved in the plasma c. less oxygen is in the plasma compared to bound to hemoglobin d. it contains less carbon dioxide e. veins run deeper than arteries
Which of the following individuals pioneered the use of chemicals to reduce the incidence of infections during surgery?
A. Nightingale B. Snow C. Ehrlich D. Lister E. Semmelweis
DNA is tightly wound in a double helix for much of the time. What enzyme unwinds the double helix and be-gins transcription of RNA?
a. RNA polymerase b. DNA polymerase c. Transcriptase d. RNA isomerase e. Complementary isomerase