The last protein in a signaling pathway is called the ____
a. target protein
b. final acceptor
c. electron acceptor
d. second messenger
e. effector protein
ANSWER: a
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Villi and microvilli in the small intestine _____
A) neutralize stomach acid B) activate trypsinogen C) increase the surface area to increase the efficiency of nutrient absorption D) emulsify lipid molecules
In organisms, the ability to control osmosis depends on the properties of the plasma membranes of individual cells. Based on their ability to permit the free movement of water and some solutes, these membranes are best described as
(select all correct choices): A. impermeable. B. permeable. C. semipermeable. D. diffusible. E. impervious.
Chromatin material is
A. one of six materials that make up a chromosome. B. really the same as a chromosome. C. one of the cytoplasmic organelles during the cell's normal daily operation. D. not described by any of these statements.
Phagocytosis is the main function of what two types of human white blood cells?
a. Macrophages and T lymphocytes b. Platelets and neutrophils c. Macrophages and neutrophils d. Eosinophils and T lymphocytes