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.
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Refer to the accompanying figure. In which portion of the bone does red blood cell production occur?
a. B b. C c. J d. H e. I
All of the following may have been in the atmosphere of primitive Earth EXCEPT
A. hydrogen. B. ammonia. C. water. D. oxygen.
Koplik's spots are diagnostic for
a) rubella. b) measles. c) herpes simplex. d) chickenpox.
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