Apical-basal patterning genes are expressed in
A. the basal region
B. the apical region
C. the central region
D. the apical, basal, and central regions
E. the apical and basal regions.
D. the apical, basal, and central regions
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Defects in cell signaling can lead to a cancerous cell due to:
A. overproduction of signals that trigger cell division. B. overproduction of a receptor that triggers cell division. C. a defective receptor that stays in the activated state and triggers cell division continuously. D. a defective signal-transduction protein that stays in the activated state and triggers cell division continuously. E. All of these choices are correct.
All of the following are features of capillaries that promote exchange between blood and interstitial fluid EXCEPT which one?
A) Capillaries lack connective tissue in their walls. B) Capillary walls consist of a single layer of squamous epithelial cells. C) Capillary walls have pores within the cells and slits between the cells, making them "leaky." D) Capillary walls lack smooth muscle. E) Capillaries have tiny valves that keep the blood flowing in one direction.
Small pieces of DNA can be amplified by a process known as polymerase chain reaction
Indicate whether the statement is true or false
Which of the following is the largest or most inclusive group?
A) Family B) Genus C) Order D) Phylum E) Class