Amplification of DNA is accomplished by
A. DNA sequencing.
B. gene probes.
C. Southern blot.
D. polymerase chain reaction.
E. All of these choices are correct.
Answer: D
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In early experiments to understand the control of the cell cycle, researchers fused HeLa cells that were at different
stages of the cell cycle. What did the results of these experiments suggest?
a. The concentrations of cyclin dependent kinases (Cdks) fluctuate throughout the cell cycle. b. The concentrations of cyclins fluctuate throughout the cell cycle. c. The cell cycle has three checkpoints through which the cell must pass in order to progress through to mitosis. d. Microtubules play an essential role in the progression of the cell cycle. e. Molecules in the cytoplasm control the progression of the cell cycle.
Energy is commonly defined as “the capacity to do
work.” This definition is a. incorrect. b. adequate in the physical sciences. c. adequate in the biological sciences. d. no more than a clue to the actual properties of the concept. e. not accepted by most scientists.
Most humans need about ________ kcal per day
A) 500-700 B) 1,300-1,800 C) 2,500-3,000 D) 20,000-30,000
Where are the olfactory receptor cells located?
What will be an ideal response?