By weight, chromatin consists roughly of
A) 1/3 DNA, 1/3 histones, and 1/3 nonhistones.
B) 1/3 DNA and 2/3 acidic proteins.
C) 1/2 DNA, 1/4 histones, and 1/4 basic proteins.
D) 1/4 DNA, 1/4 RNA, 1/4 histones, and 1/4 nonhistones.
A) 1/3 DNA, 1/3 histones, and 1/3 nonhistones.
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Why was it important for Mendel to remove the anthers from pea plants in his experiments when crossing two different true-breeding pea plants?
A. To prevent self-fertilization B. To make sure self-fertilization would occur C. To protect the pea plants from environmental pollen D. To stimulate the pea plants to ovulate
You use several model organisms in your lab's research. Which of your model organisms would you expect to exhibit a higher mutation frequency: E. coli, D. melanogaster, or M. musculus?
What will be an ideal response?
What happens during the cotransport of glucose and sodium ions?
a. The transport of glucose powers the transport of sodium. b. ATP causes a conformational change in the carrier protein. c. Both D and E d. Glucose molecules are transported against their concentration gradient. e. Sodium ions are transported against their concentration gradient.
Amylase is produced by the
A) salivary glands, small intestine, and pancreas. B) salivary glands and pancreas. C) salivary glands only. D) pancreas only. E) small intestine only.