The primary function of molecular membranes is the transport of ions and molecules in and out of cells. The movement of molecules from areas of low concentration to those of high concentration against chemical gradients is best described as:
A) passive transport.
B) osmosis.
C) active transport.
D) channel-mediated diffusion.
E) electron transport.
C) active transport.
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Which of the following structures in males is shared by both the urinary and reproductive systems?
a. urinary bladder b. prostate gland c. ureter d. vas deferens e. urethra
All of the following characteristics are common to facilitated diffusion and active transport except for ____
a) none of the choices is correct b) the requirement of energy c) high specificity d) the use of a membrane-spanning protein
If the formation of the endoderm does not take place in an embryo, yet the embryo, for whatever reason, continues to develop, which of the following structures will NOT develop?
A) Skin B) Nervous system C) Heart D) Kidneys E) Stomach
This ebola protein interferes with interferon production.
a) VP-35 b) L c) VP 30 d) GP 125