Which type of bonds hold the two chains of DNA together in a DNA molecule?
a. hydrogen
b. polar covalent
c. nonpolar covalent
d. ionic
e. peptide
ANSWER: a
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The movement of auxin from the apical to basal sides of immature leaf cells—and toward the xylem and phloem of the stem—is an example of ________________
A. trophic transport B. polar transport C. bi-directional transport D. paraxial transport
Products that limit pH changes are often incorporated into media and are referred to as
A. enzymes. B. bases. C. buffers. D. acids.
Peripheral vascular diseases are disorders of the blood vessels that are located outside of the heart and brain.
Answer the following statement(s) true (T) or false (F)
Which of the following is true of a cell membrane?
A. They allow all substances to pass B. It's selectively permeable C. Cell membranes surround plant, animal, and bacteria cells D. It's a bi-layer composed of phospholipids and proteins