What is presented on the macrophage surface?
A. hapten plus class II MHC
B. carrier protein plus class II MHC
C. hapten plus class I MHC
D. carrier protein plus class I MHC
Answer: A. hapten plus class II MHC
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How many water molecules are produced during the formation of a triglyceride from fatty acids and glycerol?
A. 0 B. 1 C. 2 D. 3 E. 4
During replication, which enzyme unwinds the two strands of the DNA molecule from one another?
A. Helicases B. Ligases C. Unwindases D. Primases
The first barrier to invasion is
a. antibody production. b. intact skin and body cavity linings. c. direct attack by white blood cells. d. innate immunity. e. development of memory cells.
In Prokaryote genetics, Transduction can be defined as the:
A. Use of a bacteriophage (bacterial virus) to transfer DNA between cells. B. Naked DNA is taken up from the environment by bacterial cells. C. The correct answer is not listed. D. Direct transfer of DNA from one bacterial cell to another.