Which of the following statements about GABA receptors is not true?
(a) They are located on postsynaptic membranes.
(b) They are ligand-gated channels.
(c) They inhibit synaptic signaling.
(d) They promote neuronal uptake of Na+.
(d)
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Which one of the following can contribute to a protein's tertiary structure?
A. ionic bonding B. van der Waal's forces C. covalent bonding D. hydrogen bonding E. All of these choices are correct.
If all of the variation in a trait in the population is due to differing genotypes, then the mean phenotype of the offspring would be identical to the parental mean
A. true B. false
Which one of the following describes an event that takes place during gene regulation at the level of the chromosome?
A. Chromatin becomes condensed in order for transcription to begin. B. Chromatin coils so it can become more accessible to the proteins that carry out transcription. C. RNA polymerase and associated proteins bind to nucleosomes. D. Chromatin is remodeled and nucleosomes are repositioned so that specific regions of the DNA can be made available for transcription. E. Cytosine bases in the sequence near the promoter of a gene become methylated in order to stimulate transcription.
The counterstain in the Gram stain is
a. A negative stain. b. A mordant. c. An acid dye. d. A basic dye. e. Necessary to determine the Gram reaction.