The beginning of pregnancy is marked by:
A. ovulation.
B. fertilization.
C. implantation.
D. more than 24 weeks of gestation.
C
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Which of the following is normally treated by antifungal creams and solutions?
A. Subcutaneous mycoses B. Systemic mycoses C. Superficial mycoses D. Intramuscular mycoses
The equation, 6CO2 + 6H2O ?C6H12O6 + 6O2, describes which of the following processes?
A. light reaction B. nitrogen fixation C. photosynthesis D. Calvin cycle E. aerobic respiration
One of Chargaff's rules states that
A. A = G and T = C. B. A = T + G + C. C. A = C and T = G. D. A = T and G = C.
Various techniques have been developed to isolate strains of bacteria carrying a particular mutation. One of them is, bacteria containing wild-type cells and cells of a desired mutant are grown on a medium lacking the nutrient for which the desired mutants are auxotrophic but containing an antibiotic that only kills growing cells. In this environment,
A. wild-type cells die; mutant cells survive. B. wild-type cells survive; mutant cells die. C. both wild-type and mutant cells survive. D. only double mutants survive. E. both wild-type and mutant cells are killed.