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.
Answer: B
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What is the correct sequence of steps during infection of plants by nitrogen-fixing bacteria?
A) Rhizobia release Nod factors; roots release flavonoids; rhizobia proliferate inside of root hair; infection thread grows into the root cortex; nodule forms. B) Rhizobia release flavonoids; roots release Nod factors; rhizobia proliferate inside of root hair; infection thread grows into the root cortex; nodule forms. C) Roots release flavonoids; rhizobia release Nod factors; rhizobia proliferate inside of root hair; nodule forms; infection thread grows into the root cortex. D) Roots release flavonoids; rhizobia release Nod factors; rhizobia proliferate inside of root hair; infection thread grows into the root cortex; nodule forms. E) Nodule forms; infection thread grows into the root cortex; rhizobia proliferate inside of root hair; rhizobia release flavonoids and Nod factors.
Contrast in microscopy is most commonly achieved by:
a. changing objectives for various specimens. b. increasing the resolution or resolving power. c. staining techniques. d. adding a blue filter to the light path.
A trip to space finds a planet rich with green light. Scientists hope to introduce a photosynthetic organism to this
planet. What sort of organism should they choose?
What will be an ideal response?A species that consumes only animal tissue is called a(n) ________
Fill in the blank(s) with correct word