The secondary structure of a protein includes ________
A) ?-helix and ?-pleated sheet
B) gamma and delta
C) hydrophobic clusters
D) alpha and gamma
E) disulfide bridges
A
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Set of chemicals that can keep the pH of a solution stable by alternately donating and accepting ions that contribute to pH is called a(n) _____
1.acid 2.base 3.buffer system 4.solution
Mammals fill their lungs using a negative pressure mechanism.
Answer the following statement true (T) or false (F)
Currently, two extant elephant species (X and Y) are placed in the genus Loxodonta, and a third species (Z) is placed in the genus Elephas. Thus, which statement should be true?
A. Species X and Y are not related to species Z. B. Species X and Y share a common ancestor that is still extant (in other words, not yet extinct). C. Species X and Y are the result of artificial selection from an ancestral species Z. D. Species X and Y share a greater number of homologies with each other than either does with species Z. E. Species X, Y, and Z share a common ancestor, but nothing more can be claimed than this.
Which reaction does carbonic anhydrase catalyze?
A. HbO2 ? Hb + O2 B. Hb + O2 ? HbO2 C. H2CO3 ? H2O + CO2 D. H+ + HCO3- ? H2CO3 E. none of these