The space between the two membranes of the mitochondrion accumulates ____.
A. proteins
B. H+
C. carbohydrates
D. H2O2
E. CO2
Answer: B
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A mass extinction, in which the dinosaurs disappeared from Earth, occurred approximately ____ years ago
a. 6500 b. 65,000 c. 650,000
d. 65,000,000 e. 650,000,000
Sphincters
a. are muscles in longitudinal arrangement. b. prevent movement of material through the digestive tract. c. are smooth muscles. d. are only found at the beginning of the stomach. e. can contract but not relax.
Who proposed the fluid mosaic model of cell membrane structure in 1972?
a. Davson and Singer b. Frye and Edidin c. Brown and Goldstein d. Singer and Nicholson e. Davson and Danielli
A student was studying a microorganism using a bright-field microscope. She was unable to resolve the microorganism on her first attempt. Based on the facts learned in class, what would you recommend the student do to increase resolution?
a. increase the amount of light b. use a lens with higher numerical aperture c. use anger wavelength light d. use a lens with lower numerical aperture