Sudden nutrient perturbations in an environment generally ________ the overall prokaryotic diversity

A) increase
B) decrease
C) maintain
D) replicate


Answer: B

Biology & Microbiology

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At what point in this action potential diagram does the onset of Na+ channel inactivation stop the

inward flow of Na+?

a. A b. B c. C d. D e. E

Biology & Microbiology

Which membrane would show a more rapid recovery of fluorescence in a FRAP study?

A. a membrane containing equal amounts of saturated and unsaturated fatty acids B. a membrane containing a larger proportion of saturated fatty acids C. a membrane containing a larger proportion of unsaturated fatty acids D. The saturation of fatty acids in a cell membrane does not affect the speed of fluorescence recovery in a FRAP study. E. a membrane containing a large amount of cholesterol

Biology & Microbiology

Receptor tyrosine kinases (RTKs) are found at high levels on various cancer cells. A protein, Herceptin, has been found to bind to an RTK known as HER2. This information can now be utilized in breast cancer treatment if which of the following is true?

A) If Herceptin is found in the breast lymph nodes of the patient. B) If HER2, administered by injection, is in sufficient concentration. C) If the patient's cancer cells have detectable HER2. D) If the patient's genome codes for the HER2 receptor. E) If the patient's genome codes for the manufacture of Herceptin.

Biology & Microbiology

Which of the following is an incorrect pairing?

A) primary structure; amino acid sequence B) secondary structure; disulfide bridges C) tertiary structure; covalent bonds D) quaternary structure; two or more polypeptides E) secondary structure; ?-pleated sheets

Biology & Microbiology