The atomic number of an element is ________
a. the sum of its photons and electrons
b. the number of protons
c. the sum of its protons, neutrons, and electrons
d. the number of electrons
Answer: b
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Telomere shortening puts a limit on the number of times a cell can divide. Research has shown that telomerase can extend the life span of cultured human cells. How might adding telomerase affect cellular aging?
A) Telomerase will speed up the rate of cell proliferation. B) Telomerase eliminates telomere shortening and retards aging. C) Telomerase shortens telomeres, which delays cellular aging. D) Telomerase would have no effect on cellular aging.
Proofreading by DNA polymerase must occur before the end of this process to avoid acquiring a mutation:
a. cell division b. duplication c. transcription d. translation e. replication
In the water cycle approximately what percent of water evaporates from the surfaces of plant leaves?
a. 10 b. 22 c. 48 d. 70 e. 90
A(n) ________ is a permeable underground layer of rock, sand, and gravel saturated with groundwater.
A. aquifer B. submergence C. natural spring D. hot spring