Which of the following is TRUE of ligand-gated ion channels?
A. They bind ions with high affinity.
B. They tend to allow any ion to pass through the channel.
C. The intracellular domain of the channel contains the binding site for the ligand.
D. They open upon binding the ligand to allow specific ions to pass through them.
E. Ligand binding closes the channels preventing further ion passage through the channel.
D. They open upon binding the ligand to allow specific ions to pass through them.
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A chromosome of genotype C D recombines with a homolog of genotype c d during meiosis when Spo11 produces a double-strand break between the two loci. If anticrossover helicase disentangles the invading strand, the likely outcome would be
A) two C D and two c d gametes. B) two C d and two c D gametes. C) one C D, one C d, one c D, and one c d gamete. D) four C D gametes. E) four c d gametes
Where would you expect to find methanogens?
A) Near a volcano B) In the surf along the beach C) On the surface of plants D) In the digestive tract of cows
In many ways, the regulation of the genes of a particular group of viruses will be similar to the regulation of the host genes. Therefore, which of the following would you expect of the genes of a bacteriophage?
A) regulation via acetylation of histones B) positive control mechanisms rather than negative C) control of more than one gene in an operon D) reliance on transcription activators
Blood flows directly from the intestine, where nutrients enter, to the liver, which
A. removes and alters many of these nutrients. B. adds bile to the blood. C. increases the number of enzymes and completes digestion. D. simply allows the blood to pass through.