Which of the following is an exogenous antigen?

A) a bacterium inside a cell
B) a virus inside a cell
C) a bacterium outside a cell
D) a noninfected human cell
E) the malaria parasite inside a red blood cell


C

Biology & Microbiology

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Three genes (X, Y, and Z) are in the same region of a bacterial chromosome. To determine the order of these genes, you infect X?Y?Z? cells with a lysate from wild-type cells infected with a generalized transducing phage. When X+ cells are selected, 70% of cells are also Y+ and 5% of cells are Z+. When Y+ cells are selected, 68% of cells are also X+ and 1% are Z+. What is the relative arrangement of the three genes?

A) Z is in the middle, but closer to X. B) Y is in the middle, but closer to Z. C) X is in the middle, but closer to Y. D) X is in the middle, but closer to Z.

Biology & Microbiology

Which type of double-stranded break repair would you expect to be used by a cell in the G1 phase of the cell cycle?

What will be an ideal response?

Biology & Microbiology

Carolus Linnaeus is considered to be the founder of __________, and he __________.

a. paleontology; believed in catastrophism b. uniformitarianism; believed the same geologic forces are operating today that occurred in the past c. the binomial classification system; thought that resemblances among different species reflected the pattern of their creation d. genetics; described the mechanism for descent with modification e. evolution; first proposed that acquired characteristics are inherited

Biology & Microbiology

Which of the following is not studied in the field of proteomics?

A. which genes give rise to which proteins B. protein concentration in a cell C. chemical modifications of proteins D. cellular location of particular proteins E. protein-protein interactions

Biology & Microbiology