A nucleus is 4 ?m in diameter. Its DNA is composed of a million base pairs. Approximately how much does it need to be condensed in order to fit inside the nucleus?
A. 30-fold
B. 100,000-fold
C. 1 million-fold
D. 3 million-fold
D
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Why must amphibians remain moist?
What will be an ideal response?
The DNA molecule is most similar
functionally to a
a. pair of scissors. b. flash light battery. c. cookbook. d. ballpoint pen. e. craft kit of ceramic tiles.
Which of the following is formed last in the transfer
of solar energy? a. H+ b. excited electrons c. ATP d. O2 e. NADPH
Cells from the root of a carrot may be used to generate an entire carrot plant. This illustrates that
a. every cell of the root contains all of the plant's genes. b. only cells of the root contain the plant's genes. c. plants are easier to clone than animals. d. carrots may be used for therapeutic cloning. e. a carrot's roots contain all of the tissues of an adult plant.