DNA associates very tightly with nucleosomes because
A. histone H1 tightens the coils of DNA that are wrapped around the nucleosome.
B. DNA can form covalent bonds with histone proteins.
C. the amino acids of histone proteins are largely acidic, while DNA molecules are basic.
D. negative charges on DNA are attracted to positive charges of the histone proteins.
E. the histone tails wrap tightly around the DNA double helix.
Answer: D
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The discovery of retroviruses changed our understanding of
A) gene structure and organization. B) the flow of genetic information. C) protein synthesis. D) infectious particles.
Suppose that a mistake made during DNA replication in a cell is not corrected, but instead the
mutation remains in the single strand where it occurred. Then suppose that after the cell divides both daughter cells survive, and those cells then go on to have DNA replication and ultimately cell division. There are now four cells where there once was one cell. Assuming that the mistake was never corrected and that no new uncorrected mistakes occurred, how many of the four cells will have the mutation in their DNA?
a. none b. one c. two d. three e. four
Maria is pregnant and a week past her due date, and her doctor decides to induce labor. Her physician will use pitocin, which is a synthetic form of which natural hormone?
A) progesterone B) oxytocin C) estrogen D) prolactin
The ________ is the distance between the center of a lens and the point at which it focuses parallel beams of light.
Fill in the blank(s) with the appropriate word(s).