Which of the following factors does not influence animal heat exchange?
A) oxygen diffusion rate
B) conductivity of fat
C) movement of blood to the body's surface
D) fat thickness
A
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The process of carbon dioxide fixation refers to
A. reaction of carbon dioxide with water to form carbonic acid. B. release of carbon dioxide during catabolic reactions. C. reduction of carbon dioxide and incorporation into organic molecules that are assimilated. D. release of carbon dioxide during anabolic reactions.
A mutant bacterium is isolated. This bacterial strain has the characteristic of very slow, "sickly" growth. You isolate mRNA from this bacteria to use in an in vitro translation system and note that even in vitro it is difficult to use this message and obtain protein. Of the following, which is a likely explanation for these results?
A) There may be a mutation in the Shine?Delgarno sequence of the DNA, resulting in a RNA that poorly binds the ribosome. B) There may be a mutation in the ribosomal rRNA recognizing the Shine?Delgarno sequence of the message. C) This mutant may have altered tRNA molecules, such that the codon-anticodon interaction during translation is affected. D) These bacteria may not manufacture enough translation factors for effective translation. E) In this mutant, the ribosomal subunits may not associate well enough for effective translation.
As the period of fetal growth comes to an end, a steep rise in ____ levels directly causes ____
a. progesterone; uterine cells to express oxytocin receptor genes b. progesterone; uterine contractions c. estrogen; uterine cells to express oxytocin receptor genes d. estrogen; uterine contractions e. estrogen; oxytocin production
At Hardy - Weinberg equilibrium, allele frequencies
A. Change from one generation to the next so evolution does not occur B. Remain constant from one generation to the next so evolution does not occur C. Change from one generation to the next so evolution occurs D. Remain constant from one generation to the next so evolution occurs E. None of the answers are correct