In a defined medium, _____.
a. the exact chemical composition of the medium is known
b. agar is available for microbial nutrition
c. blood may be included
d. organic chemicals are excluded
Ans: a. the exact chemical composition of the medium is known
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Homologous chromosomes have which of the following?
a. the same genes at the same locus b. the same genes at different loci c. different genes at the same locus d. different genes at different loci
Meiosis produces
a. sperm cells. b. egg cells. c. body cells. d. sperm and egg cells. e. sperm, egg, and body cells.
All of the following characterize nitrogen narcosis
EXCEPT a. muscle cramps. b. neural signal disruption. c. euphoria. d. drowsiness. e. weakness.
A certain type of congenital deafness in humans is caused by a rare autosomal dominant gene. In a mating involving a deaf man and a deaf woman, could all the children have normal hearing?
A) No, because it is dominant. Children always get the dominant alleles. B) Yes, because traits assort independently. C) No, because children favor their parents. D) Yes, because it must be recessive if it's rare. E) Yes, assuming that the parents are heterozygotes (because the gene is rare), it is possible that all of the children could have normal hearing.