Which of the following is a function of inhalation through the pharynx in mammals, in addition to bringing oxygen into the respiratory system?
a. cooling the body temperature
b. contributing to osmotic balance via water loss
c. filtering out inhaled particulate matter
d. drying of the air before it reaches the lungs
c. filtering out inhaled particulate matter
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The main effect of burning peat, wood, coal, and petroleum on the Earth's climate is:
A. The fires significantly heat the air and cause a rise in global temperature. B. The smoke blocks sunlight from reaching the Earth and causes a significant lowering of the Earth's temperature. C. The fires release back into the atmosphere carbon dioxide that was once taken from the atmosphere by plants and stored in their own tissues; the increased carbon dioxide holds in solar heat and causes a rise in temperature. D. The rising heat from fires produces wind that cools the surface of the Earth. E. The fires use up oxygen that would otherwise block penetration of ultraviolet light from reaching the Earth; the increased ultraviolet radiation heats the Earth.
When the gene for rat growth hormone was injected
into mouse eggs, a. they were subsequently implanted unsuccessfully into female mice. b. a third of the offspring of the surrogate mothers grew much lager than their littermates. c. the rat gene integrated into the mouse DNA, but did not express itself. d. the rat gene failed to integrate into the mouse DNA. e. all of the offspring of the surrogate mothers grew much larger than their littermates.
When the first generation parents are homozygous for different alleles, a 3:1 phenotype ratio will most
likely appear in which generation of offspring? a. P1 b. H1 c. A1 d. F1 e. F2
The earliest developmental stage among these choices is
A) germ layers. B) morula. C) blastopore. D) gastrulation. E) invagination.