Which layer of the digestive tract is in direct contact with digested food?
a. mucosa
b. circular muscle
c. longitudinal muscle
d. submucosa
e. serosa
ANSWER: a
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Bacteria that naturally exhibit bioluminescence have been found in which of the following genera?
A. Pseudomonas B. Pasteurella C. Shigella D. Vibrio
In the fluid mosaic model of a typical plasma
membrane, what accounts for the fluidity?
a. the proteins, being large, cause the membrane to jiggle around. b. the phospholipids collectively form a jellylike substance similar to the cytoplasm. c. the phospholipids are not bonded to each other and thus are more free to move around. d. water molecules infiltrate the bilayer causing it to become more watery and thus more fluid. e. the phospholipids in a typical plasma membrane form covalent bonds which are elastic and allow the membrane to ‘stretch’.
Karl Popper suggested that scientists use "imaginative preconception," which means that successful scientists
A. do not need to do experiments to test their ideas. B. do not keep records of experiments that fail. C. often predict the outcome of experiments. D. cannot predict the outcome of experiments. E. only perform applied research.
Which of the following antibiotics inhibit translation by blocking the elongation stage? (Select all that apply)
A. chloramphenicol B. tetracycline C. streptomycin D. puromycin E. erythromycin