What is a cyclin?
A. a protein that activates kinases
B. a protein whose levels change with the cell
cycle
C. a kinase
D. Answers a and b are both correct.
D
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When subtropical forest is cleared, which biome is most likely to replace it?
a. grassland suitable for grazing b. cropland ideal for agriculture c. young forest with the same species d. desert with poor, eroded soil e. chaparral with grass and low bushes
What is NOT a viable explanation for mass extinction?
a. collisions between Earth and other bodies in the solar system b. continental movements c. adaptive radiation of new predator species in many lineages d. alterations in sea level e. habitat destruction
Which of the following pairs is mismatched?
A) Endoplasmic reticulum — internal transport B) Golgi complex — secretion C) Mitochondria — ATP production D) Centrosome — food storage E) Lysosome — digestive enzymes
An artificial pacemaker is a device that replaces the actions of the
A) atrioventricular node. B) ventricles. C) atria. D) sinoatrial node.