During _________ solutes move inside the cell, but during _______ solutes move outside the cell.
a. endocytosis; exocytosis
b. pinocytosis; phagocytosis
c. exocytosis; endocytosis
d. receptor-mediated endocytosis; pinocytosis
a. endocytosis; exocytosis
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Poly-?-hydroxybutyric acid (PHB) is a carbon- and energy-storing polymer
Indicate whether the statement is true or false.
The placenta
a. forms from endometrial and extraembryonic tissues. b. will cover about one-fourth of the inner uterine surface at full term. c. does not normally intermingle fetal blood with maternal blood. d. secretes progesterone and estrogens that maintain the uterine lining during the second and third trimesters. e. does all of these.
What are the protein-binding sequences that direct enhancers to interact with the intended promoter and that block communication between enhancers and other promoters?
What will be an ideal response?
Cell movement involves the coordination of many events in the cell. Which of the following phenomena is not required for cell motility?
(a) Myosin-mediated contraction at the rear of the moving cell. (b) Integrin association with the extracellular environment. (c) Nucleation of new actin filaments. (d) Release of Ca2+ from the sarcoplasmic reticulum.