USABO Open Exam Questions and Answers 100% Correct
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USABO Open Exam Questions and Answers 100% CorrectUSABO Open Exam Questions and Answers 100% CorrectUSABO Open Exam Questions and Answers 100% CorrectUSABO Open Exam Questions and Answers 100% Correct
Which statement is true about enzymes? Enzymes
A. Are made up of a base containing nitrogen, p...
USABO Open Exam Questions and
Answers 100% Correct
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. - ANSWER - C. Lose some or all of their normal
activity when their 3-D structure is disrupted.
You have a multicellular organism that reproduces asexually by fission. When you excise a
~10,000 cell portion of its body, both the original organism and the excised portion grow into
fully formed, healthy organisms. You take one of the offspring and repeat the procedure for one
hundred and twenty-three generations. Each time, the resulting organisms are healthy. What
must be true of the nuclei of this species?
A. The cells contain plasmids.
B. The cells have multiple forms of DNA polymerase.
C. The cells have the majority of their genome stored in circular DNA.
D. The cells contain active telomerase.
E. The cells contain active fissonase. - ANSWER - D. The cells contain active telomerase.
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. - ANSWER - 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 - ANSWER - D. Glycine
Which of the following statements about cellular ultrastructure is FALSE?
A. Nonmotile eukaryotic cilia are composed of 9 doublets of microtubules in a ring, with no
microtubules in the center ('9+0').
B. Bacterial flagella are composed of 9 doublets of microtubules in a ring, with two microtubules
in the center ('9+2').
C. Motile eukaryotic cilia are composed of 9 doublets of microtubules in a ring, with two
microtubules in the center ('9+2').
D. Centrioles are composed of nine triplets of microtubules arranged in a ring.
E. The basal bodies of eukaryotic flagella are composed of nine triplets of microtubules
arranged in a ring. - ANSWER - B. Bacterial flagella are composed of 9 doublets of microtubules
in a ring, with two microtubules in the center ('9+2').
Which of the following chemicals or groups of chemicals is not a major determinant of flower
color?
A. Flavonols
B. Carotenoids
C. Cyanidin
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