The most important factor in the control of breathing is the amount of oxygen in the blood
A. true
B. false
B
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The amino acids valine and threonine differ only by the presence of a hydroxyl group or a methyl group
The aminoacyl-tRNA synthetases for tRNAVal and tRNAThr must discriminate between using these two very structurally similar amino acids as substrate for creating charged tRNAs. The discrimination by the Valyl-tRNA synthetase is by differential binding of valine and/or threonine to a first site on the synthetase and, then, differential binding to a second site on the synthetase. This is an example of what known process in the specificity of tRNA synthetases? A. adenylation B. kinetic proofreading C. wobble D. premature termination E. accommodation
The lightly shaded countries have diversified export bases. The darkly shaded countries depend on ________ for foreign exchange (export earnings)
A) one or two commodities B) the service sector C) energy resources D) tourism E) both a and b
In the universal ABO blood grouping system,
there are four phenotypes: A, B, AB, and O. Various populations have different frequencies of these four phenotypes but, in most populations O is most common and AB least common. The ABO blood grouping system exemplifies
a. polymorphism. b. genetic drift. c. the bottleneck effect. d. the Red Queen effect. e. the founder effect.
An anthropologist discovers the fossilized heart of an extinct animal. The evidence indicates that the organism's heart was large, was well-formed, and had four chambers, with no connection between the right and left sides
A reasonable conclusion supported by these observations is that the _____. A) animal had evolved from birds B) animal was endothermic and had a high metabolic rate C) animal was most closely related to alligators and crocodiles D) species had little to no need to regulate blood pressure