The two strands of a DNA double helix are said to be antiparallel. This means that

a. one strand has a negative charge and the other strand has a positive charge.

b. the 5' end of one strand is directly paired with the 3' end of the other strand.

c. the 5' end of one strand is directly paired with the 5' end of the other strand.

d. since the double helix twists, it is not perfectly parallel

In a right-handed double helix, if one looks down the central axis of the molecule _________.

a. each strand follows a counterclockwise path moving toward the observer

b. each strand follows a counterclockwise path moving away from the observer

c. one strand follows a clockwise path moving away from the observer, the other follows a clockwise path

moving toward the observe

d. each strand follows a clockwise path moving toward the observer

e. each strand follows a clockwise path moving away from the observer

Histones are ____ and ____ charged proteins.

a. small; negatively

b. small; positively

c. large; negatively

d. large; positively

What happens if histone H1 is selectively extracted from compacted chromatin (30 nm fibers)?

a. 30-nm fibers uncoil to form a thinner, more extended beaded filament.

b. 30-nm fibers coil to form a thicker, less extended cylindrical filament.

c. 30-nm fibers completely disassemble to their component nucleotides.

d. 30-nm fibers break into small fragments.

e. 30-nm fibers break up into large fragments

Amino acid residues in histone tails are most susceptible to __________.

a. methylation

b. sulfation

c. a, b and c

d. phosphorylation

e. acetylation