The most important function of the globin (protein) portion of a hemoglobin molecule is to
a. directly bind oxygen.
b. promote binding of oxygen to the heme group.
c. allow release of oxygen from the heme group.
d. facilitate the reaction of CO2 and H2O.
e. cause constriction of the capillaries.
C; Naked heme binds oxygen very well, but will not release it to the tissues. The globin portion of the hemoglobin is necessary of oxygen release. Choice d refers to the action of carbonic anhydrase, and choice e refers to a pathological effect of naked hemoglobin.
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Refer to the paragraph on the Krings et al. paper. Why did the researchers wear protective clothing and note so emphatically that they did so?
A) They needed to be certain there were no ancient pathogens on the sample that modern humans hadn't been exposed to. B) They needed to be sure not to harm the precious sample with oils from skin or moisture from their breath. C) They needed to minimize the chance of introducing their own mitochondrial DNA to the sample. D) They needed to follow careful, standardized laboratory procedures required by law and document their compliance.
True or false: Using bacteriophage to fight a bacterial infection in humans would be unwise because the bacteriophage will also infect the human cells
A. true B. false
Wilting is counteracted by
a. turgor pressure. b. osmotic pressure. c. concentration gradients. d. diffusion. e. metabolic pressure within a cell.
A "marker" in a genetic sense usually represents a site along a chromosome where a specific nucleotide sequence exists. What specific phrase is used when such markers are identified by restriction endonucleases and a particular set of DNA fragments is
generated? A) expression QTL B) RFLP C) restriction site D) QTL