Which of the following is an endogenous source of infection?
A) contaminated medical equipment
B) zoonotic disease
C) bacteria from the skin entering a surgical incision
D) contact with another person
E) contaminated food
Answer: C
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When receptors coupled to phospholipase C are activated, calcium levels in the cytosol increase when ______
A. diacylglycerol binds to ligand-gated channels on the endoplasmic reticulum, releasing calcium. B. IP3 binds to ligand-gated channels on the plasma membrane, releasing calcium. C. diacylglycerol binds to ligand-gated channels on the plasma membrane, releasing calcium. D. IP3 binds to ligand-gated channels on the endoplasmic reticulum, releasing calcium. E. phospholipase C phosphorylates the receptor leading to calcium production.
The most fundamental and important molecule that distinguishes living systems from nonliving matter is ____
a. protein b. DNA c. fructose d. water e. glucose
Which of the following is NOT a function of the nasal cavities?
a. filter dust out of the incoming air b. detect odors c. warm the air d. oxygenate the blood e. moisturize the air
Approximately what percentage of the human genome encodes proteins?
a. 1 b. 3 c. 5 d. 15 e. 50