What would happen if you injected a calcium-channel blocking chemical into a muscle cell?
A. It would be unable to communicate with nerves.
B. It would be unable to contract.
C. It would relax more slowly.
D. It would die.
E. It would divide.
B. It would be unable to contract.
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The gas tail of a comet always
a. trails behind the head along the orbital path. b. extends ahead of the head along the orbital path. c. points toward the Sun. d. points away from the Sun. e. points perpendicular to the orbital path.
Even in the absence of sperm, metabolic activity in an egg can be artificially activated by _____
A) abnormally high levels of carbonic acid in the cytosol B) abnormally low levels of extracellular oxygen C) injection of calcium ions into the cytosol D) depletion of its ATP supplies
Which of the following is found at the end of a eukaryotic chromosome?
A. Telomeres B. Centromeres C. Kinetochores D. Origins of replication
When a cell makes a cell membrane bound growth factor that binds to receptors on neighboring cells causing them to proliferate this is an example of _____.
A. endocrine signaling B. direct intercellular signaling C. contact-dependent signaling D. paracrine signaling E. autocrine signaling