Four of the five events listed below are related to
pairing of chromosomes. Select the exception.
a. pairing of homologues
b. crossing over
c. exchange of genes
d. tight aligning of homologues
e. segregation of chromosomes during anaphase I
Answer: e
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The data in the previous graphs indicate that _____
A) a hybrid zone was established after the completion of the bridge B) there was no migration between the two squirrel populations after the bridge was completed C) gene flow occurred from one type of squirrel into the gene pool of the other type of squirrel D) two-way migration of squirrels occurred across the bridge, but without hybridization E) some northern squirrels migrated south, but no southern squirrels migrated north across the bridge
Exposure to sarin, a potent nerve gas, results in muscle paralysis. Therefore, sarin must interfere with which neurotransmitter?
A) serotonin B) GABA C) dopamine D) enkephalins E) glutamate
Reduction of environmental temperatures to freezing rapidly leads to cell death as a result of ____
a. inhibition of cell division b. inhibition of molecule transport across the cell membrane c. increased cellular signaling d. increase in metabolic reactions e. decreased lipid synthesis
Most sodium chloride is excreted from marine bony fishes through:
a. the kidneys. b. the gills. c. salt glands. d. the feces. e. diffusion.