In general, when cytosine bases in CpG islands are methylated:
A. transcription is active and rapid.
B. transcription is active, but slow.
C. transcription is repressed.
D. translation is active and rapid.
E. translation is repressed.
C
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Describe how neutral, alkaline, and acidic solutions differ from each other.
What will be an ideal response?
Sperm pass through several stages during their development. The earliest stage in which the cell
becomes haploid is the
a. sperm. b. spermatid. c. primary spermatocyte. d. secondary spermatocyte. e. spermatogonium.
Impressive was a champion Quarter Horse stallion with a magnificent muscular physique, a trait that he passed on to dozens of offspring. However, many of Impressive's offspring developed periodic muscular twitching that sometimes left the horses temporarily unable to move. Some horses even died. As it turns out, Impressive's award-winning physique was due to a mutation in a single, protein-encoding gene, resulting in hyperexcitable muscle (which contracts even in the absence of a stimulus from its motor neuron). Which is not a plausible explanation for the identity of the abnormal muscle protein in Impressive and his offspring?
A. Overactive troponin molecules B. Acetylcholine receptors that function in the absence of acetylcholine C. Tropomyosin that is unable to bind to actin D. Leaky Na+ channels E. Overactive Ca2+ pumps in the membrane of the sarcoplasmic reticulum
Which parts of amino acids are involved in a peptide bond?
A.) side chains of both amino acids B.) carboxyl group of one amino acid and side chain of the other C.) amino groups of both amino acids D.) carboxyl groups of both amino acids E.) amino groups of one amino acid and carboxyl group of the other F.) amino group of onw amino acid and side chain of the other