Consider the following events in the nuclear receptor model:
(1) Hormone receptor complex binds to DNA.
(2) Messenger RNA directs synthesis of specific proteins.
(3) Hormone binds to receptors in the nucleus (sometimes in the cytoplasm)
(4) Messenger RNA synthesis is activated.
(5) Synthesized proteins produce the response of the cell.
Which of these events occurs in the nucleus?
A. 1, 3, 5
B. 1, 3, 4
C. 1, 2, 3
D. 3, 4, 5
E. All events occur in the nucleus.
B
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Which is not involved in the process of bone repair following a fracture?
A. A fibrocartilaginous callus serves as a model for new bone growth. B. The fracture hematoma reorganizes to form a procallus. C. Osteoclasts remove excess bone from the hard callus. D. Fibroblasts produce collagen fibers to connect broken pieces of bone. E. No exceptions; all of the choices are involved in the process of bone repair.
ADP released by platelets is involved in reducing blood flow through an injured vessel by
a. causing the vascular musculature to remain contracted longer during the vascular spasm. b. causing the surface of nearby endothelial cells to become sticky so that platelets will stick to them, enhancing aggregation of platelets. c. causing the surface of nearby platelets to become sticky so that platelets will stick to them, enhancing aggregation of platelets. d. increasing the release of fibrinogen by activated platelets. e. all of these.
In the intestine, ________ ensure(s) that most digested nutrients pass through the epithelial cells and not between them.
A. gap (communicating) junctions B. the plasma membrane C. ground substance D. tight junctions E. desmosomes
Vesicles and glycoproteins required at the synapse are moved down a nerve fiber by ________ axonal transport.
A. slow B. fast