Which of the following can cause double-stranded breaks in DNA?
A. ultraviolet radiation
B. cosmic rays
C. gamma rays
D. microwaves
E. All of the choices given are correct.
E
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Before the genes of a zygote become active, the stages of animal development are directed by
a. the environment. b. the cytoplasmic determinants of the egg. c. the cytoplasmic determinants of the sperm. d. the cytoplasmic determinants of the egg and the sperm. e. the nucleus.
Glucose is removed from filtrate by _____.
Fill in the blank(s) with the appropriate word(s).
Herbivores may also be referred to as
A) producers. B) quaternary consumers. C) primary consumers. D) carbohydrate consumers. E) autotrophs.
Which statement best describes the reproductive isolation between populations of Rhagoletis flies, one of which is found on apple trees and the other that is found on hawthorn trees?
A) Hybrid offspring of the two populations are sterile. B) Hawthorn trees and apple trees grow in different areas, so the two populations do not encounter each other. C) Male flies of one population cannot physically mate with females from the other population. D) Apple-liking males are more likely to encounter apple-liking females than hawthorn-liking females. E) Eggs laid by female flies mated with a male from the "wrong" population do not develop.