Which of the following arrangements is sometimes referred to as having a beads-on-a-string appearance?

A) streptococci
B) staphylococci
C) streptobacilli
D) diplococci
E) palisade


Answer: A

Biology & Microbiology

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The SOS regulatory system is activated by

A) the activity of DNA polymerase IV. B) DNA damage. C) transcription of LexA. D) repression of RecA.

Biology & Microbiology

Fungi parasitic on plants produce specialized hyphae, called ____, that penetrate the host

a. asci b. basidia

c. soredia d. haustoria e. secondary mycelia

Biology & Microbiology

Both ATP and NADPH are required for

A. neither the light reaction nor the Calvin cycle. B. the light reaction only. C. electron transport through the thylakoid membrane. D. both the light reaction and Calvin cycle. E. the Calvin cycle only.

Biology & Microbiology

Which plants in this figure must all be heterozygous?


A) purple-flowered plants in the P generation
B) white-flowered plants in the P generation
C) purple-flowered plants in the F1 generation
D) purple-flowered plants in the F2 generation

Biology & Microbiology