Active transport is like facilitated diffusion in that both processes
A) move molecules down their concentration gradient.
B) require the presence of proteins in the plasma membrane that move molecules from one side of the plasma membrane to the other.
C) require the conversion of ADP to ATP.
D) do not require a source of energy.
E) facilitate the movement of water through the phospholipids of the plasma membrane.
B
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What 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. more than one of these
The multicelled projections that protrude from the lining of the small intestine are called ____
a. sphincters b. brush borders c. microvilli d. villi e. macrovilli
In order to be considered infertile, how long must a couple go without achieving pregnancy despite regular unprotected intercourse?
A. 30 days B. 3 years C. 1 year D. 6 months E. 12 weeks
Which cluster of terms accurately reflects the nature of DNA replication in prokaryotes?
A) random point of initiation, unidirectional, semiconservative B) fixed point of initiation, bidirectional, conservative C) fixed point of initiation, bidirectional, semiconservative D) random point of initiation, bidirectional, semiconservative E) fixed point of initiation, unidirectional, conservative