Which of the following is used as an electron carrier by living organisms?
A. Ubiquinone
B. NADP+
C. NAD+
D. All of the choices are correct.
Answer: D
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Bone loss outpaces bone formation when a person suffers from ____
a. osteoporosis b. Parkinson's disease c. muscular dystrophy d. Alzheimer's disease e. bone spurs
Another planetary body that astrobiologists list as a
top priority for exploration to search for life is a. Pluto. b. Venus. c. the moon around earth. d. Europa, a moon around Jupiter. e. none of these. Answer: d
Explain why geneticists believe that almost all chromosomally abnormal embryos and fetuses are eliminated as
pregnancy progresses. What will be an ideal response?
You grow a culture of bacteria and split it into two culture tubes. One sample of bacteria you treat with calcium and the other is not treated. When you transform both samples with a plasmid, only the samples treated with calcium take up the plasmid. Which of the following best explains your results?
A. The bacteria use calcium as a source of energy to take up the DNA. B. Calcium precipitates DNA, preventing it from being taken up by cells. C. The bacteria require calcium to grow. D. DNA is degraded in the absence of calcium. E. The calcium makes the bacterial membrane more porous to DNA.