Which of the following options correctly pairs a polymer and its monomer?
A) cellulose, amino acids
B) DNA, nucleotides
C) collagen, nucleic acids
D) RNA, ribose
Answer: B
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The structural genes of the lactose operon are: (Select all correct choices)
A. always expressed unless the operon is turned off by a repressor. B. turned on in the presence of lactose. C. turned off by the presence of lactose.
__________ is a concentration of nerves and sensory
structures at the head end. Fill in the blank(s) with the appropriate word(s).
Which is a symptom of a transmissible spongiform encephalopathy (TSE)?
a. influenza-like symptoms b. progressive immune deficiency c. degeneration of the digestive tract d. inflammation of the reproductive organs e. degeneration of the brain and central nervous system
During chordate evolution, what is the sequence (from earliest to most recent) in which the following structures arose? 1. amniotic egg 2. paired fins 3. jaws 4. swim bladder 5. four-chambered heart
A) 2, 3, 4, 1, 5 B) 3, 2, 4, 5, 1 C) 3, 2, 1, 4, 5 D) 2, 1, 5, 3, 4