Assume the Na+ is being transported across a membrane via facilitated diffusion. Which of the following conditions would allow for the most transport of Na+ across the membrane?


Ans: A gradient of more than 50% difference between sides for the Na+ and Na+ diffusing toward Cl-

Biology & Microbiology

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Which of the following molecules stabilizes the cell membrane during coated pit formation?

A) mannose-6-phosphate B) KDEL signals C) clatherin D) botulinum toxin E) stabilin

Biology & Microbiology

After you eat lunch, the nutrients in your food are released in the digestive process and eventually make their way into the blood. The rising nutrient levels quickly move beyond the standard homeostatic range. Normally, a hormone would be released at this time to regulate these nutrients. Imagine that in your case, that return to homeostatic levels does not occur. What hormone would you need to receive to return blood levels to normal?

A. glucagon B. insulin C. cortisol D. epinephrine E. growth hormone

Biology & Microbiology

At present, the neutral theory of molecular evolution ________

A) is strongly supported by significant amounts of empirical evidence B) has been disproven, as neutral mutations have not been shown to have been fixed in populations C) is inclusive, as enough data has not yet been evaluated D) seems to work in some species but not others

Biology & Microbiology

Prokaryotic cell movement is attributed to:

A. pili. B. ribosomes. C. flagella. D. cytoskeleton proteins. E. capsules.

Biology & Microbiology