How do buffers minimize change in the pH of biological systems?

A. By donating H+ ions when there is a shortage
B. By absorbing H+ ions when there is an excess
C. Both of these
D. Neither of these


Answer: C

Biology & Microbiology

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Other than the proteins that they encode, what is a major difference between cell-specific and housekeeping genes?

a. Cell-specific genes are expressed only in a single cell type; housekeeping genes are expressed in all cell types. b. Cell-specific genes have promoter proximal elements and enhancers; housekeeping genes have only promoter proximal elements. c. Cell-specific genes have promoter proximal elements that use cell-specific activators; housekeeping genes use "universal" activators. d. Cell-specific genes are only found in certain cell types; housekeeping genes are found in all cell types. e. Cell-specific genes have promoter proximal elements that use "universal" activators; housekeeping genes have promoter proximal elements that respond only to specific activators.

Biology & Microbiology

An organism that lives on dead organic matter is known as a 

A. commensal organism. B. saprophyte. C. parasite. D. None of the above is correct.

Biology & Microbiology

Birds are the only group of animals that are endothermic.

a. true b. false

Biology & Microbiology

How do hormonal methods prevent conception?

What will be an ideal response?

Biology & Microbiology