The histone octamer forms a tightly packed particle, but the N-termini that protrude from the octamer are less ordered. Which is the best explanation for this observation?
A. The charges on the amino acid residues in the N-terminal tails are primarily acidic and repel each other.
B. The charges on the amino acid residues in the N-terminal tails are primarily basic and flex to accommodate the DNA.
C. The N-terminal tails must be flexible because they bind to and then release DNA during transcription.
D. The N-terminal tails must be more flexible because they form intermolecular contacts with other nucleosomes.
E. The N-terminal tails must be more flexible because they interact within the minor groove of DNA.
D
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The primary curves of the vertebral column are the
A) cervical, lumbar, and sacral. B) thoracic and coccygeal. C) cervical and thoracic. D) thoracic and sacral. E) dorsal and ventral.
What is the carrying capacity for the number of humans on the Earth?
1.1 billion
2.6 billion
3.10 billion
4.It cannot be predicted with any certainty.
Which of the following may result in anemia?
a. a deficiency of iron b. a deficiency of iodine c. a deficiency of chlorine d. a deficiency of calcium
The secondary antibody response is ________ because of antigen stimulation of ________
a. high titer / T cells b. low titer / memory cells c. rapid / memory cells d. mostly IgM / B cells