Molecular genetic evidence that certain genes shared by both humans and fruit flies initiate eye development in both species suggest a common
A) complete genome.
B) use of ATP in energy-transfer reactions.
C) genetic toolkit for development.
D) homunculi.
E) duration of pregnancy.
Answer: C) genetic toolkit for development.
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The digestive enzyme pepsin works in the acidic environment of the stomach to hydrolyze peptide bonds. As a result, pepsin affects which macromolecule?
A. carbohydrate B. protein C. DNA D. lipid
Which of the following statements about the evolution of animal cell adhesion molecules is true?
A. Animal cell adhesion molecules evolved from protein families that originally performed other functions. B. The genes for integrins are found in all opisthokonts including animals, plants, and fungi. C. The genes for cadherins are only found in animals. D. The genes for integrins are found only in multicellular organisms. E. All of these statements about the evolution of animal cell adhesion molecules are true.
If a small vessel is torn, which component of
the blood will temporarily fill the breach?
a. plasma proteins b. leukocytes c. platelets d. erythrocytes e. all of these
Which of the following is NOT involved in
nitrogen fixation? a. breaking triple bonds b. production of ammonia c. production of NO3 ? d. production of NH4 + e. All of these are involved in nitrogen fixation