Select the statement that correctly describes the roles of histone and nonhistone proteins found in chromatin?
A) Only histones have a structural role in chromatin.
B) Only nonhistone proteins have a structural role in chromatin.
C) Histone proteins function primarily in chromosome segregation.
D) Both histone and nonhistone proteins have a structural role in chromatin.
E) Nonhistone proteins function only in replication and chromosome segregation.
D) Both histone and nonhistone proteins have a structural role in chromatin.
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Specific targeting of an antigen is a
characteristic of which line of defense?
a. first b. second c. third d. all of these e. none of these
Flattened sacs of internal membranes associated with photosynthesis are called
A. cristae. B. chloroplasts. C. thylakoids. D. photosystems. E. the stroma.
What is the difference between a stable isotope and a radioisotope?
a. A stable isotope emits light. b. A radioisotope emits radiation. c. A stable isotope emits radiation. d. A stable isotope absorbs radiation. e. A radioisotope has an unequal number of protons and electrons.
Which of the following causes blood to move through veins?
A) vasodilation B) contraction of smooth muscle C) blood pressure D) contraction of skeletal muscle