Diphtheria toxin is produced only by strains of Corynebacterium diphtheriae that are infected with a particular bacteriophage. This is an example of

A. lysogenic conversion.
B. induction.
C. conjugation.
D. lysis.


Answer: A

Biology & Microbiology

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Photosynthesis and respiration both play a major role in the ____ carbon cycle, and can affect atmospheric CO2 levels on a seasonal or annual basis

Fill in the blank with the appropriate word.

Biology & Microbiology

Which of the following statements about nucleotides is (are) true?

A) A nucleotide contains a nitrogenous base. B) A nucleotide contains a pentose. C) A nucleotide contains a phosphate group. D) All of the above statements are true.

Biology & Microbiology

Chemical mutagens that mimic the naturally occurring bases are called

A. nitrogen mustards. B. alkylating agents. C. base analogs. D. nitrous oxide.

Biology & Microbiology

The probability that two genes will be separated by crossing-over is related to:

a. the phenotype that they control. b. how far the two genes are from the centromere. c. the distance between the two genes on the chromosome. d. whether the two genes are located on a sex chromosome. e. how far the genes are from the kinetochore.

Biology & Microbiology