_____ bonds link the sugar and phosphate groups in the backbones of DNA molecules
a. Covalent phosphodiester
b. Hydrogen
c. Weak
d. Ionic
e. Weak covalent
a
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During breeding season, one should expect female house finches to prefer to mate with males with the brightest red feathers. Which of the following is true of this situation?
A) Alleles that promote more efficient acquisition of carotenoid-containing foods by males should increase over the course of generations. B) Alleles that promote more effective deposition of carotenoid pigments in the feathers of males should increase over the course of generations. C) There should be directional selection for bright red feathers in males. D) All three of these. E) Only B and C.
Depending on the disease, individuals can be contagious during the incubation and prodromal periods as well as the periods of illness, decline, and convalescence.
a. true b. false
Which of the following results in characteristic of mycoplasma spp. colony culture?
A. Alpha-hemolysis on blood agar B. Beta-Hemolysis on blood agar C. Double zone of hydrolysis on egg-yolk lecithin D. Fried egg colonies on agar E. Growth on chocolate agar
Eukaryotic cells may contain all of the following except:
A) photosynthetic pigments. B) flagella. C) a peptidoglycan cell wall. D) ribosomes. E) a membrane-bound nucleus.