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
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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.
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.
Birds are the only group of animals that are endothermic.
a. true b. false
How do hormonal methods prevent conception?
What will be an ideal response?