Diploid human cells contain 22 homologous chromosomes and a pair of ________
Fill in the blank with correct word.
Answer: sex chromosomes
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Ice melts spontaneously at room temperature, even though the process is endothermic. How is this possible?
A) ?H is small, so melting still obeys the second law of thermodynamics. B) The Gibbs free-energy relationship does not apply to phase changes such as melting. C) Water has a very high specific heat. D) There is a large increase in entropy.
The acetylcholine receptor is
A. a ligand-gated ion channel that produces depolarization by allowing Na+ ions to enter the muscle fiber. B. a ligand-gated ion channel that produces hyperpolarization by allowing Na+ ions to enter the muscle fiber. C. a ligand-gated ion channel that produces depolarization by allowing Cl- ions to enter the muscle fiber. D. a ligand-gated ion channel that produces depolarization by allowing K+ ions to leave the muscle fiber. E. a metabotropic receptor that stimulates muscle activity by activating second messenger systems within the muscle fiber.
Bacteria ____
a. are haploid b. are diploid c. are polyploid d. have double-stranded RNA genomes e. have single-stranded DNA genomes
Preliminary diagnosis of prostate cancer is by a _____.
A. rectal examination B. Pap test C. CT Scan D. angiogram