Exam (elaborations)
USABO TEST PREP QUESTIONS AND ANSWERS
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USABO TEST PREP QUESTIONS AND ANSWERS
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USABO TESTPREP QUESTIONS
AND ANSWERS
Which statement is true about enzymes? Enzymes...
A. Are made up of a base containing nitrogen, phosphate, and ribose.
B. Have activity that is independent of temperature and pH.
C. Lose some or all of their normal activity when their 3-D structure is disrupted.
D. Provide the activation energy needed to activate a reaction. E. Work once only and
then are destroyed. - Answers-C. Lose some or all of their normal activity when their 3-
D structure is disrupted.
Which of the following correctly describes how the lifespan of a protein is regulated?
A. The part of the sequence coded for by the UTR tags it for destruction.
B. Giant protein complexes called ubiquitins destroy proteins after they have remained
in the cell for a certain time.
C. Proteins are methylated over time; heavily methylated proteins are destroyed by
proteasomes.
D. Proteins are tagged with ubiquitins, which are recognized by proteasomes; the
proteasomes destroy the proteins.
E. Proteins tagged with methyl groups are destroyed by ubiquitins. - Answers-D.
Proteins are tagged with ubiquitins, which are recognized by proteasomes; the
proteasomes destroy the proteins.
Of the following amino acids, which is least likely to form strong interactions with other
amino acids that contribute to the tertiary structure of a given protein? A. Histidine
B. Glutamate
C. Cysteine
D. Glycine
E. Serine - Answers-D. Glycine
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