The largest of all the whales is the:
a. sperm whale.
b. sei whale.
c. humpback whale.
d. blue whale.
e. megalodon.
D
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Nucleosomes are bead-like structures ____
a. that form during interphase to assist with DNA uncoiling b. that are a major class of proteins in chromatin c. composed of histone wrapped with DNA d. composed of linked homologous chromosomes e. composed of pyrimidines and purines
Lack of ___ in a diet can cause ___
a. iron---hypothryroidism b. iodine---hypothryroidism c. iodine---hyperthryroidism d. iron---hyperthyroidism e. iodine---hypertension
When auditory hair cells bend they ____
a. produce action potentials b. are inhibited c. release neurotransmitters d. cause a pressure wave to strike the eardrum e. inhibit the auditory nerve
A karyotype is a physical representation (usually a photograph) of all of the chromosomes in a single cell; however, the cell must be in mitotic metaphase when the karyotype is made. Why?
a) Metaphase is the only stage of the cell cycle in which single chromosomes move toward the poles. b) Metaphase is the only stage of the cell cycle in which the cell membrane is permeable to dye. c) Metaphase is the only stage of the cell cycle in which both sets of homologous chromosomes are present in the cell. d) Metaphase is the only stage of the cell cycle in which the chromosomes have condensed and aligned, but have not yet separated. e) Metaphase is the only stage of the cell cycle in which both sister chromatids of each chromosome are present in the cell.