Intracytoplasmic membrane systems housing vesicles known as chromatophores, which function in photosynthesis, are commonly found in

A) algae.
B) green sulfur bacteria.
C) most autotrophic organisms.
D) purple phototrophic bacteria.


Answer: D

Biology & Microbiology

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The enzyme reverse transcriptase synthesizes:

A. DNA from RNA. B. RNA from DNA. C. proteins from RNA. D. proteins from DNA. E. double-stranded RNA from doublestranded DNA.

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Which of the following characteristics of the glmS riboswitch is also true of the TPP riboswitch?

A. The glmS riboswitch is a ribozyme. B. The structure of the riboswitch is the same, whether bound by ligand or not. C. The riboswitch lowers the rate of translation when bound to its metabolite ligand.

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dentical twins result from a single fertilization to form a zygote, which then clones itself.

a. true b. false

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Which of the following is used to treat shingles?

A) penicillin B) sulfonamide C) trifluridine D) fungicide E) acyclovir

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