An example of a trace element in the diet is
A. cobalt.
B. protein.
C. carbohydrates.
D. calcium.
Answer: A
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A muscle contraction always involves a decrease in the length of the muscle fiber
A. true B. false
The sexual phase of Plasmodium is called a:
A. sporozoite B. gametocyte C. merozoite D. plasmacyte E. anthracite
Which of the following statements about the structure or composition of DNA is FALSE?
A. DNA is a double helix. B. Complementary base-pairing occurs between pyrimidine and purine bases. C. The amount of thymine closely approximates that of guanine within a particular organism. D. Each nucleotide within a DNA strand is separated by about 0.34 nm. E. Adenine pairs with thymine and guanine with cytosine.
Aspergillus and Penicillium are related because both
a. produce antibiotics. b. reproduce sexually using ascospores. c. are club fungi. d. parasitize human mucous membranes. e. lack known sexual stages.