Which of the following occurs in vascular land plants but not charophytes (stoneworts)?
A) sporopollenin
B) lignin
C) chlorophyll a
D) cellulose
E) chlorophyll b
Answer: B
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Which substance is not capable of diffusing across the endothelial cells of a capillary? a. Carbon dioxide b. None are capable of diffusing across the endothelial cells
c. All are capable of diffusing across the endothelial cells. d. Small lipid soluble molecules e. Oxygen
Members of the Archaea differ from members of the Bacteria (or eubacteria) in that only the members of the Archaea have
a. different lipids in their membranes. b. a nuclear membrane. c. enzymes to carry out respiration in their plasma membranes. d. a peptidoglycan cell wall. e. a variety of morphologies, including cocci and vibrios.
ACTH
a. is secreted by the posterior pituitary. b. has target cells in the autonomic nervous system. c. has target cells in the adrenal cortex. d. has target cells in the adrenal medulla. e. initiates the autoimmune response.
Which of the following antiviral drug categories is incorrectly matched with its description?
A) Nucleotide reverse transcriptase inhibitors: Target retroviruses B) Nucleoside analogs: Mimic normal nucleotides interfering with nucleic acid replication C) Interferons: Used for postexposure prophylaxis D) Proteases: Target protein-cutting enzymes which make mature virons E) Antisense antivirals: Short sequences of nucleotides that are complementary to viral RNA