Horseshoe crabs have lived in the earth’s oceans for ____ years
a. about 4 thousand
b. close to 400 thousand
c. less than 40 million
d. over 400 million
e. over 4 billion
ANSWER: d
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Identify the structure indicated by #5:
A. epididymis B. seminal vesicle C. testis D. vas deferens E. prostate gland
What role do bacteria play in mudflat food webs?
a. Primary consumers b. Primary producers c. All of these choices d. Consumers
Autoimmunity is typically due to
A. a deficiency in T-cell development. B. a transfusion reaction. C. graft rejection. D. IgE and mast cells. E. autoantibodies and T cells.
Which of the following statements regarding the chemical grooming of pyruvate is false?
A) Two molecules of pyruvate are each converted into two-carbon molecules joined to a coenzyme A molecule. B) Each pyruvate loses a carbon atom, which is released as CO2. C) Two pyruvate molecules together contain less chemical energy than was found in the original glucose molecule. D) Each pyruvate molecule has a CO2 added and then joins with an NADH.