The structural formula for molecular oxygen is depicted as O=O. What kind of bond holds molecular oxygen
together?
a. ionic
b. polar covalent
c. single covalent
d. double covalent
e. triple covalent
ANSWER: d
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Ribosomes can catalyze formation of peptide bonds. This supports the hypothesis that _____
a. an RNA world preceded DNA-based genomes b. RNA can hold more information than DNA c. the first protists had RNA as their genetic material d. all of these
The importance of enzymatic competition is that
A. different end products can be formed at different times when needed. B. it reduces the amount of enzymes in the cell to an optimum. C. it guarantees that all enzymes will form enzyme-substrate complexes. D. no substrates will go unchanged by an enzyme.
Digested fats are packaged into ________, which are too big to enter blood capillaries and so have to diffuse into lacteals, where fats enter the lymph and are transported within the lymphatic system
A) micelles B) chyme C) chylomicrons D) bile salts E) lipases
All of the following statements about Bacillus anthracis are true EXCEPT
A. Inhalation may produce severe pneumonia in humans B. Anaerobic C. The agent is a straight rod with square ends D. Human infection can be a localized skin infection E. Immunization of domestic animals has resulted in only rare illness in humans