What is the characteristic lesion of Yersinia pestis?
A. a bubo
B. a chancroid
C. a soft chancre
D. petechiae
E. oozing abscesses in the intestinal wall
Answer: A
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Receptors for polar molecules are found ____ while receptors for nonpolar molecules are located
____.
a. on the cell surface; within the cell b. within the cell; on the cell surface c. on the cell surface; on the nuclear membrane d. on the nuclear membrane; on the cell surface e. on the cell surface; within the membrane interior
Hardy-Weinberg conditions were established in the lake after the asteroid hit. The fish population mated and produced the next generation. Scientists sampled 100 fish that were all offspring of the post-asteroid population. How many yellow fish will be among the 100 offspring sampled?
A) 4 B) 8 C) 15 D) 30 E) 32
The genetic sex of a human is determined by
a. ploidy, with the male being haploid. b. the Y chromosome. c. X and Y chromosomes, the male being XX. d. the number of X chromosomes, the male being XO. e. Z and W chromosomes, the male being ZZ.
What is the type of bond between the hydrogen of one molecule and the nitrogen of another molecule?
a. Ionic bond b. Covalent bond c. Hydrogen bond d. Disulfide bond e. Hydrophobic bond