What occurs during the annealing stage of a PCR reaction?
A. The DNA strands separate
B. The DNA polymerase copies the template DNA
C. The primers bind to complementary sequences of the template DNA
D. The reaction stops
C
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Which of the following is NOT a fat soluble vitamin?
a. A b. C c. D d. E e. K
Place the steps of bacterial antigen processing and presentation in the correct order
1. Lysosomal enzymes digest the bacterium into molecular bits. 2. The antigen-MHC complex is displayed on the cell surface. 3. The endocytic vesicle fuses with a lysosome. 4. A bacterium is engulfed by a phagocytic cell.
a. 4-3-1-2 b. 4-3-2-1 c. 3-4-2-1 d. 3-4-2-1 e. 2-4-3-1
Consider a human somatic cell in the G2 phase of the cell cycle. Which statement is false?
A: The cell will have 92 chromosomes. B: The cell will have 92 chromatids. C: The cell will have 92 DNA molecules in the nucleus. D: The cell will be diploid. E: All are true statements.
Disease spread in poorer countries of the world is increased by
A) inadequate medical care. B) lack of immunizations and antibiotics. C) malnourishment. D) all of the above.