Which of the following statements regarding latent viral infections is true?
a. Latent viral infections are caused by the slow conversion of cellular glycoproteins from normal to infectious form.
b. Latent viral infections are almost always fatal.
c. During latent infections, small amounts of virus are produced, and virus numbers build up over time.
d. Latent infections can persist for years in an individual without causing any symptoms.
Answer: d. Latent infections can persist for years in an individual without causing any symptoms.
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Which of the following choices is not descriptive of a fast-twitch muscle fiber?
a. pale in color b. produces ATP by lactate fermentation c. no myoglobin d. many mitochondria
How do the lungs absorb oxygen from the air while releasing carbon dioxide from the blood?
a. Oxygen diffuses into capillaries passively, while carbon dioxide is expelled from the body by the action of respiratory enzymes. b. Transport proteins in the plasma membranes of alveoli cells actively transfer oxygen into the blood and carbon dioxide into the lungs. c. Partial pressure gradients between alveoli and capillaries cause oxygen and carbon dioxide to diffuse in opposite directions. d. Carbon dioxide is not present in capillaries; it is synthesized from oxygen within the alveoli cells within the lungs.
A group of organs in the body that have a common function make up a(n) ________
A) organism B) brain C) organ system D) tissue
Building blocks of carbohydrates are amino acids.
a. true b. false