Base pairs in DNA are held together by ________ bonds.
A. peptide
B. hydrogen
C. polar covalent
D. nonpolar covalent
E. sulfhydryl
Answer: B
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Lipopolysaccharide is an important cell envelope component of ________.
A. gram-positive bacteria B. gram-negative bacteria C. mycoplasmas D. acid-fast bacteria E. protoplasts
Secondary metabolites are termed “secondary” because
a. they are synthesized as part of basic metabolism. b. they are only synthesized in plant leaves. c. they are synthesized as precursors to primary metabolism. d. they are not synthesized in all plant cells as part of basic metabolism. e. they are only synthesized in plant roots.
Which of the following best describes sponges?
A) They are asymmetrical, lack tissues, and do not move. B) They are symmetrical, lack tissues, and do not move. C) They are asymmetrical, have tissues, and do not move. D) They are symmetrical, have tissues, and do not move.
Esophageal varices are a direct result of:
A) esophageal erosion. B) alcohol consumption. C) portal hypertension. D) cirrhosis of the liver.