The structures that connect neighboring cardiac muscle cells to ensure rapid electrical conduction are
a. desmosomes.
b. intercalated discs.
c. synapses.
d. endothelial cells.
e. smooth muscle cells.
B
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Heterozygote advantage refers to the tendency for heterozygous individuals to have better fitness than homozygous individuals. This higher fitness results in less genetic variation in the population.
a. true b. false
The scenario of prebiotic evolution leading to the origin of life on Earth is plausible because
A) it has been observed under laboratory conditions. B) there was a vast period of time for simple chemicals to evolve into complex molecules found in cells that exist today. C) experiments suggest that all of the chemical components of living cells can be formed quickly from inorganic precursors. D) it has been observed to occur on other planets. E) it has been observed to occur near thermal vents at the bottom of the ocean.
When injured or irritated, our mast cells release ______.
Fill in the blank(s) with the appropriate word(s).
Which of the following is not a source of energy to produce ATP?
What will be an ideal response?