DNA most directly determines which __________ are made by a cell
a. polysaccharides
b. polypeptides
c. nucleotides
d. triglycerides
e. fatty acids
B
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Which of the following statements is NOT true
about asteroids? a. They have had little influence on the history of life. b. They do not emit light and are difficult to see. c. Their impacts have produced craters visible in satellite images. d. One asteroid impacted our planet just prior to the mass extinctions at the K-T boundary. e. An asteroid impact releases an enormous quantity of energy.
What factor has been implicated as a trigger for the formation of artery-blocking plaques?
a. allergies b. inflammation c. hypertension d. blood clots e. low blood fats
________ are frequently used to treat pulmonary infections and have a large ring as their basic structure
Fill in the blank(s) with the appropriate word(s).
Penicillins and cephalosporins
A. block the peptidases that cross-link glycan molecules. B. attach to the 30S ribosomal subunit and disrupt protein synthesis. C. are metabolic analogs of PABA and block folic acid synthesis. D. damage cell membranes. E. interfere with DNA synthesis.