Carbon dioxide (CO2) is
A. returned to the atmosphere during respiration and fermentation.
B. used by marine organisms to make limestone for their hard shells.
C. removed from the atmosphere during photosynthesis.
D. a source of carbon for autotrophs.
E. All of the choices are correct.
Answer: E
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Which one of the following is not found at the site of protein synthesis?
A) DNA B) mRNA C) rRNA D) tRNA
Gram-negative diplococci are isolated from a genital specimen and yield the following results: • Glucose: positive • Maltose: negative • Lactose: negative The organism can be identified as:
a. N. gonorrhoeae. b. Neisseria meningitidis. c. Neisseria lactamica. d. M. catarrhalis.
Which structure or compartment is separate from the apoplastic route?
A) the lumen of a xylem vessel B) the lumen of a sieve tube C) the cell wall of a mesophyll cell D) the cell wall of a root hair
White matter areas of the nervous system mostly contain:
A) ganglia. B) neuron cell bodies. C) myelinated axons. D) cerebrospinal fluid.