The emergence of a new plant species over a brief period of time followed by a long period of little change is consistent with which of the following theories?

A) the gradual model of speciation
B) allopatric speciation
C) punctuated equilibrium
D) adaptive radiation


Answer: C

Biology & Microbiology

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Which of the following statements concerning cyclin-dependent kinases (CDKs) is NOT true?

A. CDKs are enzymes that attach phosphate groups to other proteins. B. CDKs are active, or "turned on," when complexed with cyclins. C. CDKs are present throughout the cell cycle. D. CDKs are inactive, or "turned off," in the presence of cyclins.

Biology & Microbiology

One hope of personalized medicine is that:

A. physicians will be able to use an individual's genotype to identify the most effective medication for that patient. B. physicians will be able to use an individual's lifestyle factors to identify the most effective medication for that patient. C. it will lead to treatments that are more widely useful across genotypes. D. it will lead to medications with fewer sideeffects. E. it will lead to preventative treatments for diseases for which each individual is uniquely at risk.

Biology & Microbiology

What is the difference between a food chain and a food web?

What will be an ideal response?

Biology & Microbiology

Secretion occurs mainly in the:a

distal convoluted tubule. b. loop of Henle. c. proximal convoluted tubule. d. collecting duct. e. glomerulus

Biology & Microbiology