The chlorophyll known as P680 has its electron "holes" filled by electrons from
a. photosystem I
b. photosystwm II
c. water
d. NADPH
e. accessory pigments
Ans: c. water
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Assortative and disassortative mating are similar in that both ____
A. are kinds of selection pressure. B. change only the expected Hardy-Weinberg genotype frequencies in a population. C. are examples of random mating. D. change only the expected Hardy-Weinberg allele frequencies in a population. E. change both the expected Hardy-Weinberg allele and genotype frequencies in a population.
If a trait has a heritability of 0.5, this means that
A. all variation in the population is caused by genotypic differences. B. all variation in the population is caused by environmental differences. C. the variation in the population is the result of epigenetic effects. D. the genotype and environment contribute equally to the variation seen in the population. E. None of these is true.
Researchers have shown that turnips can produce interferon (an antiviral agent) and tobacco plants can create antibodies to fight human disease as a result of controlled genetic alteration. Such plants are known as
A. Genetically Manipulated (GM) organisms. B. cloned organisms. C. Genetically Modified (GM) organisms. D. vector organisms.
All of the following are characteristics of type 2 diabetes mellitus except
a. arises most commonly in adulthood. b. caused by insensitivity of fat and muscle cells to insulin. c. often associated with obesity. d. the least common form of diabetes.