Biological membranes contain bilayers containing mostly ______
A. oils
B. prostaglandins
C. triglycerides
D. cholesterol
E. phospholipids
E
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Each branch point or node of a phylogenetic tree represents:
A. an environmental pressure for evolution. B. a mutational event that leads to two species. C. common ancestor to two connected branches. D. the beginning of a new domain. E. the point when life started on earth.
Would drinking a gallon of tap water, a gallon of sea water, or a gallon of beer produce the most urine? Which would
produce the least urine? Why?
What will be an ideal response?In goats, the gene for coat color is on an autosome and light brown color is dominant to black. A light brown male is mated to a black female, producing a black kid (baby goat). If they produce another kid, could it be light brown? If so, what are the chances of it being light brown?
A. yes, but it will depend on whether the kid is male or female B. yes, 50% as the male must be heterozygous for color C. no, since the black allele is present all offspring will be black D. yes, 100% since the first kid was black the next one has to be light brown E. yes, 75% since light brown is dominant
Which is correct regarding the rate of microbial death?
A. Cells become metabolically inactive but are never killed. B. Cells die at increasingly greater rates. C. Upon contact with the control agent, all cells die at one time. D. Cells in a culture die at a constant rate. E. Only older cells die in a culture.