Which type of microscope cannot image live specimens?

A. Phase-contrast
B. Bright-field
C. Differential interference
D. Dark-field
E. Electron


Answer: E

Biology & Microbiology

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What is one reason that RNA viruses and retroviruses have such a high rate of mutation?

A. because RNA replication is much more prone to mistakes B. because RNA viruses and retroviruses initially cause mutations during replication C. because RNA is more fragile than DNA and therefore more likely to be damaged D. because they lack a proofreading mechanism E. because RNA is more fragile than DNA and because viral polymerases lack a proofreading mechanism.

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How many origins of replication does the E. coli chromosome contain?

A) none B) 1 C) 2 D) 3 E) many

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Which are the male gametophytes in flowering plants?

a. sperm b. anthers c. pollen grains d. stamens

Biology & Microbiology

A phage is a virus that infects

A) bacteria. B) plants. C) animals. D) humans.

Biology & Microbiology