Which protein can be produced by a virus-infected cell, in order to communicate with other cells that need to produce antiviral proteins?
A. Albumin
B. Histamine
C. Interferon
D. Lysozyme
E. Complement
Answer: C
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All three domains (Bacteria, Archaea, and Eukarya) follow the same genetic code. Therefore, which of the following statements would most likely be correct?
A) The genetic code evolved three times. B) The genetic code evolved before DNA replaced RNA as the unit of genetic information. C) There were no mutations following the evolution of the genetic code. D) The genetic code evolved before the different domains diverged.
RNA differs from DNA in that
A) it is usually single-stranded. B) it is usually double-stranded. C) it has thymine instead of uracil. D) it has deoxyribose instead of ribose.
Which neurotransmitter stimulates skeletal muscle contraction, slows cardiac muscle contraction rate, and affects
mood and memory?
a. acetylcholine b. epinephrine c. dopamine d. serotonin e. an endorphin
Oxygen crosses a plasma membrane by
A) osmosis. B) active transport. C) endocytosis. D) passive transport.