What happens to nutrient macromolecules in an animal's digestive tract?
A) They are absorbed whole and are then broken down into monomers within cells that ultimately use them.
B) Proteins and nucleic acids are digested into monomers before absorption; energy-storage macromolecules (starch and fat) are absorbed whole.
C) The digestive breakdown of macromolecules determines the monomers that are immediately needed and therefore produced.
D) Nutrient macromolecules are digested into monomers before absorption.
Answer: D
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When Mendel crossed two plants that were heterozygous for a single trait, what was the phenotypic ratio of their offspring?
A. 1:2:1 B. 9:3:3:1 C. 3:1 D. 7:4 E. Varied depending on the trait
Lake Baikal in Siberia is an ancient lake with a very diverse fauna. This diversity is consistent with the
A. time hypothesis. B. individualistic model. C. organismic model. D. principle of species individuality. E. effects of decreasing latitude and decreasing temperatures.
Establishment of lysogeny by phage is usually influenced strongly by
A. the physiological condition of the host at the time of infection. B. components of the host replication machinery. C. the previous host infected by the virus. D. None of the choices are correct.
Usually, an egg cell from a human female contains
a. one X chromosome and one Y chromosome. b. one X chromosome. c. one Y chromosome. d. two X chromosomes. e. two Y chromosomes.