What cellular feature allows a mineral such as manganese to diffuse from cell to cell after being taken up by roots?
A) Sieve plates
B) Microfilaments
C) Plasmodesmata
D) Microtubules
E) Secondary cell walls
C
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Which is the correct order of cytoskeletal filaments in decreasing filament diameter?
A. microfilaments > microtubules > intermediate filaments B. microtubules > intermediate filaments > microfilaments C. microtubules > microfilaments > intermediate filaments D. intermediate filaments > microfilaments > microtubules
Which of the following pathways does not require DNA ligase?
A. gap repair B. fork regression and resolution of a stalled replication fork C. synthesis-dependent strand annealing D. double-strand break repair E. All of the pathways given require DNA ligase.
__________ species of many plants (and a few animals) originated by chromosome doublings and
hybridizations. Fill in the blank(s) with the appropriate word(s).
Which of the following physiological effects would likely occur first in a volunteer who was breathing air from which the CO2 was removed?
A. decreased blood pH B. Decreased respirator rate C. Increased respiratory rate D. increase pulse rate E. increase blood pressure