In the comparison of a DNA molecule to a twisted ladder, the rungs (footholds) of the ladder are
A) nitrogenous bases linked together.
B) nitrogenous bases linked to phosphate.
C) deoxyribose linked to sulfate.
D) the backbones of the molecule.
E) deoxyribose linked to phosphate.
A
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A gram-positive bacillus, which grew on Tinsdale agar, is esculin hydrolysis–negative, urease-positive, and nonlipophilic. The organism can be identified as:
a. C. diphtheria. b. Corynebacterium glucuronolyticum. c. Corynebacterium xerosis. d. Corynebacterium ulcerans.
Which of the following is(are) associated with balance?
a. semicircular canals b. cochlea c. incus, malleus, and stapes d. eardrum and ear canal
Contact inhibition is best explained by which statement?
a. Contact between neighboring cells triggers reactions leading to inhibition of mitosis. b. As neighboring cells become more tightly packed together, their size is restricted and cytokinesis can no longer occur. c. As cell number increases, the protein kinases they produce compete with neighboring cells, inhibiting mitosis. d. As cell number increases, the level of waste products increases, consequently slowing metabolism leading to mitosis. e. As cell number increases, size restrictions inhibit protein synthesis.
You might expect to see an example of the founder effect in:
a. the Hawaiian Islands. b. Central Africa. c. states along the Mississippi River. d. a tropical rain forest. e. China.