Blood glucose levels must be carefully maintained within a narrow window. What endocrine organ is responsible for this task?
A. Pancreas
B. Pituitary gland
C. Pineal gland
D. Parathyroid gland
Answer: A
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You digest DNA from the frog Xenopus laevis with the enzyme NotI that produces sticky DNA ends. You can ligate your DNA to:
_____ blunt AluI ends from Xenopus laevis. _____ sticky NotI ends from Xenopus laevis. _____ blunt AluI ends from bacteria. _____ sticky NotI ends from bacteria. _____ sticky EcoRI ends from Xenopus laevis. _____ sticky EcoRI ends from bacteria.
Constipation may lead to the development of
a. hemorrhoids. b. gallstones. c. duodenal ulcers. d. gastric ulcers. e. Barrett's esophagus.
Which statement about lampbrush chromosomes is incorrect?
A) Looped out regions are active in RNA synthesis. B) The loops consist of two DNA helices, whereas the axis consists of a single DNA helix. C) They are meiotic chromosomes. D) More DNA is looped out from the axis than is required for a single gene. E) Instead of being condensed, they are extended.
In gel electrophoresis, DNA molecules move toward the ________ electrode because they have an overall ________ charge.
A. negative; negative B. positive; positive C. negative; positive D. positive; negative E. negative and positive; neutral