What conclusions are consistent with these data? (Select all that apply.)

A researcher is studying the rII locus of phage T4. Three rII- strains are obtained: A, B, C, and D. In the first experiment, E. coli strain K(?) is coinfected with two rII- strains simultaneously and the results are recorded.

Infection with A and B phage = plaques form
Infection with A and C phage = plaques form
Infection with B and C phage = no plaques form
Infection with B and D phage = no plaques form
Infection with C and D phage = no plaques form

In a second experiment, coinfections are performed first in E. coli strain B, then the progeny phage are used to infect E. coli strain K(?).

Progeny of A and B phage = plaques form
Progeny of B and C phage = plaques form
Progeny of C and D phage = plaques form
Progeny of B and D phage = no plaques from

A) Strains B and D both carry the same mutation.
B) Strains B, C, and D carry mutations in the same gene.
C) Strain A carries a mutation in a different gene than strains B, C, and D.
D) Strains A and B carry mutations in the same gene.
E) Strains B and C both carry the same mutation.
F) A, B, C, and D carry mutations in the same gene.


A) Strains B and D both carry the same mutation.
B) Strains B, C, and D carry mutations in the same gene.
C) Strain A carries a mutation in a different gene than strains B, C, and D.

Biology & Microbiology

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a. B b. C c. J d. H e. I

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All of the following may have been in the atmosphere of primitive Earth EXCEPT 

A. hydrogen. B. ammonia. C. water. D. oxygen.

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Koplik's spots are diagnostic for

a) rubella. b) measles. c) herpes simplex. d) chickenpox.

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Which of the following pairs is mismatched?

A) spirochete — axial filament B) aerobic, helical bacteria — gram-negative C) enterics — gram-negative D) mycobacteria — acid-fast E) Pseudomonas — gram-positive

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