The protein product of the E. coli dnaE gene is a component of ________
A) DNA polymerase I
B) primase
C) DNA polymerase III
D) DNA ligase
E) DNA helicase
Answer: C
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How does the immune system of vertebrates utilize a chemical concentration gradient?
A) The immune system produces thousands of histamines that act solely to create a histamine diffusion barrier. B) The immune system generates a gradient of reactive oxygen intermediates to increase the amount of toxic radicals and peroxides to combat invading pathogens. C) The immune system releases chemical signals called chemokines, which create a chemical gradient that leukocytes use in migrating toward the infection site. D) The vertebrate immune system does not use chemical gradients.
Which of the following statements about the cell cycle is correct?
A. The cell cycle is a sequence of replications and divisions that produces a new cells. B. The phases of the cell cycle are G1, S, and M phases. C. In actively dividing cells, the S and G2 phases are collectively known as interphase. D. When the S phase of the cell cycle is finished, a cell has twice as many chromatids as the number of chromosomes in the G1 phase. E. During G2 phase, the cell grows and copies its chromosomes in preparation for cell division.
The animals that remain isosmotic to the surrounding seawater are called:
a. osmoconformers. b. osmoregulators. c. hyperosmotic. d. hyposmotic. e. euryhaline.
Which of the following statements is accurate?
a. All Canada geese populations migrate. b. All Canada geese breed where they were raised. c. Like other migratory birds, Canada geese are protected by federal law. d. When living together, migratory Canada geese do not interbreed with nonmigratory ones. e. Nonmigratory Canada geese have more goslings (baby geese) than migratory geese