In plant cells, cytokinesis is accomplished by the formation of a(n)
a. aster.
b. membrane furrow.
c. equatorial plate.
d. cell plate.
e. spindle.
Ans: d. cell plate.
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Radioisotopes are useful when
A) very high sensitivity is required. B) turnover rates need to be determined. C) the fate of portions of particular molecules need to be followed. D) very high sensitivity is required, turnover rates need to be determined, and the fate of portions of particular molecules need to be followed.
The partial twinning that led to the births of conjoined twins Abby and Brittany Hensel must have happened during the first two weeks of gestation, because the girls
A) share tissues that descend from ectoderm, endoderm, and mesoderm. B) share only tissues derived from mesoderm. C) were born on time. D) have two separate nervous systems.
Bacteria use restriction enzymes to
a. integrate viral DNA. b. destroy viral DNA. c. prevent mutation of their DNA. d. copy their genes. e. inhibit the expression of some of their genes.
Darker skin color is correlated with ____
a. the northern hemisphere b. inland regions c. coastal regions d. longitude e. the intensity of UV radiation