When an end product of a reaction is in excess and inhibits the first enzyme of the pathway, this is an example of positive feedback.

a. true
b. false


Answer: b. false

Biology & Microbiology

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The most notable difference between PrPC (normal protein) and PrPSc (prion protein) is

A. PrPC causes a cell to undergo rapid apoptosis. B. PrPC is a much longer polypeptide chain, compared to PrPSc. C. PrPc is a functional glycolytic enzyme, whereas PrPSc is nonfunctional. D. PrPc folds appropriately whereas PrPSc does not fold correctly.

Biology & Microbiology

The photosynthetic pigments bacteriorhodopsin and proteorhodopsin are present in ________ and ________, respectively

A) Archaea / Bacteria B) Bacteria / Archaea C) Bacteria / Bacteria D) Bacteria / Eukarya

Biology & Microbiology

How does a calorie (lower case "c") differ from a Calorie (upper case "C")?

a. One calorie equals 100 Calories. b. One calorie equals 1000 Calories. c. One Calorie equals 100 calories. d. One Calorie equals 1000 calories. e. They are the same.

Biology & Microbiology

The nictitating membrane of sharks is used to:

a. protect the gills. b. line the mouth. c. enclose the internal organs. d. detect smells. e. cover the eye.

Biology & Microbiology