You have a friend who tells you she is lactose intolerant. She asks you to explain what this means. You say to her:
A) "You cannot digest milk because you do not have the enzyme to break down the sugar in the milk."
B) "You cannot digest milk because you cannot absorb it in your intestines."
C) "You cannot digest the milk because you do not have the enzyme to break down the lipid in the milk."
D) "You cannot digest the milk because you do not have the enzyme to break down the protein in the milk."
E) "You are allergic to milk."
Answer: A
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A. Production of alcohol from a substrate B. Oxidation of sugar to carbon dioxide C. Use of microorganisms to modify substances not normally used for growth D. Production of a toxin from a nontoxic chemical
Beadle and Tatum irradiated Neurospora and initially grew the mutant strains on complete medium. How were they
able to determine the type of mutation for each strain? a. By growing the mold on a complete medium with extra vitamins and nutrients b. By growing the mold on minimal media supplemented with different combinations of amino acids and vitamins c. By growing the mold in its diploid form to see which traits were masked d. By comparing Neurospora to other species of mold e. By observing the marked differences in morphology between the different strains
Evolution is sometimes described as the change from preexisting life-forms to modern-day organisms. What actually changes, in every case of evolution, is the
A) ability of organisms to respond to external stimuli. B) energy and nutritional demands of the organism. C) species' physical appearance. D) rate of reproduction. E) genetic makeup of the species, due to mutations.
Since the Pleistocene ice age, deserts have been gradually forming in the southwestern United States. As the original lakes and rivers of this area shrank into isolated streams and springs, the fishes living in them developed a strong potential for:
A) hybrid inviability. B) temporal isolation. C) hybrid sterility. D) speciation.