What type of cell activates a B cell?
a. neutrophil
b. basophil
c. T helper cell
d. cytotoxic T cell
c. T helper cell
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Which of the following methods allows monitoring of the progressive destruction of CD4 T cells during an HIV infection by tagging the cells with specific antibodies to CD4 surface proteins and measuring their concentrations in serum?
A. Western blot B. ELISA C. FACS D. Latex beads agglutination E. FA test on a microscope slide
Why is cancer described as a disease of altered gene expression?
a. Gene expression controls lipid raft formation. When lipid rafts fail, cell to cell communication can break down, resulting in cancer. b. Mutated genes can trigger demyelination of the nerve cells, causing breakdown of nerve signal transmission and resulting in tumor formation. c. Mutated genes can result in proteins that behave erratically or fail to function. If they function in cell cycle control, the result can be out of control, cancerous growth. d. This statement is mostly untrue as gene expression has very little control over the development of cancer.
A gene desert is
A) a unique sequence of DNA in a genome. B) a region of a genome containing very few genes. C) a gene that is transcribed only in dry climates. D) a region of a genome containing many open reading frames but no promoter. E) a region of a genome in which all genes are transcribed at low levels.
Which description best illustrates the product of a chemical reaction?
a. It is joined by an ionic bond only. b. It is always in equilibrium with the reactants. c. It is the substance that initiates the reaction. d. It is generally written on the left side of the equation. e. It is generally written on the right side and is the substance generated by the reaction.