In a frog in which the diploid number of chromosomes per cell is 24, what is the total number of
chromatids present per cell in Prophase II after the first division and cytokinesis?
a. 0
b. 6
c. 12
d. 24
e. 48
D
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How do endophytes differ from endomycorrhizal fungi?
A. Endophytes live within leaves, whereas endomycorrhizal fungi live within roots. B. Endomycorrhizal fungi are beneficial to the plant, whereas endophytes are harmful. C. Endophytes are unicellular, whereas endomycorrhizal fungi are multicellular. D. Endophytes help plants absorb nutrients, whereas endomycorrhizal fungi help plants defend against predators and pathogens. E. Endophytes penetrate into plant cells, whereas endomycorrhizal fungi live within and between plant cell walls.
Why is it easy to measure allele frequencies in a codominant allele system?
A. Such systems are rare. B. Phenotypes are equivalent to genotypes. C. Most alleles are present in homozygous condition. D. They are present in a 1:2:1 ratio in all populations. E. None of these is true.
Which feature possessed by most land plants is missing in mosses, which grow low to the ground in damp, shaded areas?
a) chlorophyll b, so they can only use filtered light for photosynthesis b) starch production, so they only produce small amounts of glucose, since any beyond what they use immediately cannot be stored c) cell walls, so they cannot stand upright d) a protected zygote, so they must grow in damp areas to supply the zygote with moisture e) vascular tissue, so they must grow along the ground in damp areas to supply water to the cells
lacI–d mutations
a. can inactivate the repressor even if only one of the four subunits is mutant. b. occur in the region of the gene encoding the inducer binding site. c. are cis-acting. d. can only inactivate the repressor if all four subunits are mutant. e. result in the lac operon being permanently repressed.