In a chemical reaction, glyceraldehyde-3-phosphate + NAD+ yields 1,3-bisphosphoglycerate + NADH. In this reaction, what happened to NAD+?
A. It was activated to form NADH
B. It was oxidized to form NADH
C. It was reduced to form NADH
D. it served as an enzyme to catalyze the reaction, and at the end of the reaction formed NADH
Answer: C
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The Nef protein helps HIV evade the adaptive immune system by
a. destroying cytotoxic T cells. b. destroying class I MHC proteins as soon as they get to the surface of infected cells. c. destroying class I MHC proteins in the cytoplasm. d. binding to class I MHC proteins at the cell surface, thereby blocking their availability to cytotoxic T cells. e. binding to class I MHC proteins in the cytoplasm, thereby preventing their transport to the cell surface.
Which of the following statements is true of
metabolic pathways? a. They are enzyme-mediated sequences of reactions. b. They may be biosynthetic or degradative. c. Photosynthesis is a biosynthetic pathway. d. Catabolism is a degradative pathway. e. All of these statements are true
During prophase I, each chiasma represents:a
the remnants of the nuclear membrane. b. the remnant of the nucleolus. c. a newly formed haploid gamete. d. a site of crossing-over. e. the site where sister chromatids are connected
When developing a monoclonal antibody-based test kit, great care must be taken to choose an antibody with the right binding properties. Imagine that you are developing a food-testing kit to specifically detect E. coli 0157:H7, a pathogenic serotype of E. coli that causes food poisoning. Choose the hybridoma line best suited for use in your test kit.hybridoma line E. coli 0157:H7 E. coli K-12 MG1655 E. coli 0150:H5 E. coli 0152:H28 1 +++ - +++ - 2 - ++ ++ + 3 ++ - - - 4 +++ ++ ++ ++ 5 + +++ - -
A. 1 B. 2 C. 3 D. 4 E. 5