All chordates have ________
A) a dorsal, hollow nerve cord and a notochord
B) a postanal tail and a single opening for the mouth and anus
C) a cranium and vertebrae
D) pharyngeal slits and a cranium
A
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What is the immediate effect of ligand binding to a ligand-gated channel?
A. the flow of ions into or out of the cell B. a conformational change of the channel C. the activation of kinase proteins D. the formation of cyclic AMP
The humoral immune response defends against ________.
A. bacteria B. viruses C. bacterial toxins D. All of the choices are correct.
You read that the frequency of a particular disease-associated recessive allele in a population is 12%. What does that mean?
A) 12% of the population has the disease caused by that allele. B) 12% of the population is a carrier for that disease. C) For every 100 people, there are 12 copies of the allele. D) The allele is present in 12% of the cells in your body.
Which process might be affected by the mutation of a transmembrane protein in the mitochondrial membrane?
A. establishment of hydrogen ion gradient B. reduction of coenzyme NADH C. reduction of coenzyme FADH2 D. glucose transport into the mitochondrion E. transfer of acetyl CoA into the mitochondrion