The strands in a double helix of DNA are:
A. antiparallel
B. complementary
C. held together via hydrogen bonds
D. wound around each other with 10 base pairs per turn
E. antiparallel, complementary, held together via hydrogen bonds and wound around each other with 10 base pairs per turn
Answer: E
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The only survivors of a colony on Venus are a man and a woman, who both happen to originally be from southern
Ukraine. Their descendants will show the effect of ____.
a. genetic drift b. punctuated equilibrium c. excessive mutation d. heterozygote advantage e. frequency-dependent selection
Exotoxins:
A. Are made of protein B. Are always enzymes C. Are present in Gram-positive bacteria only D. All of the above E. None of the above
Natural populations cannot exceed their carrying capacities
Indicate whether the statement is true or false
Seventy percent alcohol is effective against
A) enveloped viruses. B) nonenveloped viruses. C) bacterial endospores. D) protozoan cysts. E) prions.