What is the result of adaptive radiation?
A) the extinction of one species and the replacement with another
B) the diversification of one or a few species into a varied group of descendants
C) symbiosis between eukaryotes and prokaryotes
D) convergent evolution in which unrelated species take similar forms
B
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Systolic pressure measures the force exerted by blood against the wall of a blood vessel during ventricular contraction.
a. true b. false
Why does extended hypoglycemia (low blood sugar) lead to confusion and difficulty thinking?
A. Glucose provides energy for brain cells. B. Unregulated pH of body fluids causes these symptoms. C. Glucose is major source of energy for non-nervous system cells. D. Glucose is required for chemical reactions in the body.
The most important result of mitosis is the
A. production of new varieties of cells to meet changes in the environment. B. exact duplication of the parent cell's genetic information. C. equal division of the parent cell's genetic information between the two daughter cells. D. equal distribution of the parent's cytoplasm between the two daughter cells.
When the nerve signal reaches the axon terminal, what happens next?
A. The muscle contracts. B. The synaptic vesicles release neurotransmitter. C. An electrical signal is formed that jumps the synaptic cleft. D. Myosin is released from the axon terminal. E. H+ is pumped into the synaptic cleft.