The first three children of a couple, both heterozygous for cystic fibrosis, were healthy; what is the probability that a fourth child will have the disease?
A) 100%
B) 75%
C) 50%
D) 25%
E) it is impossible to predict
Answer: D) 25%
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Gibberellin induces
a. plants to bend toward the light. b. cell division in meristems. c. hydrolysis of starch in seeds. d. fruits to ripen. e. more than one of these to occur
If the genotypic frequencies for an allele in a population at Hardy-Weinberg equilibrium are 0.635 homozygous dominants, 0.430 heterozygotes, and 0.125 homozygous recessives, what is the frequency of the recessive allele?
A) 0.35 B) 0.65 C) 0.125 D) 0.875 E) 0.01
The 11 McFarland standards represent a specific degree of turbidity. What is the degree of turbidity used for?
A) To visually standardize the growth of bacterial cultures. B) To visually standardize the pH of bacterial cultures. C) To visually standardize the level of antimicrobic resistance. D) To visually standardize the growth factors available to the bacterial cultures.
In a laboratory bacterial cell culture that has been infected by a virus, plaques are areas in which
a. bacterial cells are resistant to the virus and have not been infected. b. there is no nutrient available for the bacteria to grow. c. the virus has spread and left behind the remains of dead cells. d. the virus has not yet spread to that area of cells.