A modified form of cellulose found in the exoskeletons of insects and crustaceans is known as
A. glycogen
B. chitin
C. amylose
D. starch
Answer: B
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Loss of water from the aerial parts of plants is called _____
A) dehydration B) high heat of vaporization C) respiration D) gas exchange E) transpiration
Which of the following statements is true of non-homologous end joining (NHEJ)?
A) it is a double-strand repair pathway B) it is error-prone C) it is error-free D) it utilizes the sister chromatid as a template for repair E) both A and B
Environmental resistance may limit the size of populations by
A) increasing both birth and death rates. B) increasing death rates and/or decreasing birth rates. C) decreasing death rates and/or increasing birth rates. D) changing the biotic potential. E) decreasing both birth and death rates.
What do evolutionary models suggest about the effect of epistatic deleterious muta-tions (i.e., they act synergistically to produce greater damage than the sum of each mu-tation's individual effect)?
a. Recombination is favored as it disrupts epistatic interactions of deleterious alleles. b. There is no effect when epistasis is strong. c. Recombination is detrimental as it helps to spread deleterious alleles. d. Recombination has no effect on epistatic interactions. e. B and D.