CD4 and CD8 T cells are likely to become active when they:
A) are attracted by the inflammatory response.
B) travel through lymph nodes.
C) interact with B-cells.
D) travel through the spleen.
E) dock with a dendritic cell with a matching antigen.
Answer: E
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You perform a cell free translation experiment like Nirenberg and Matthaei, but you forget to write down what nucleotides you added to make the mRNA
You precipitate the translated polypeptides and measure the relative amount of radiolabeled amino acids incorporated into them. You get 25% proline, 25% threonine, 12.5% glutamine, 12.5% lysine, 12.5% asparagine, and 12.5% histidine. What nucleotides and in what % did you add to make the mRNA? A. Equal amounts of A, C, U, and G B. 50% C and 50% A C. 70% C and 30% A D. 50% C and 50% U E. 50% A and 50% G
Which of the following occurs during human inhalation?
a. The diaphragm contracts and the external intercostal muscles relax. b. The diaphragm relaxes and the external intercostal muscles contract. c. The diaphragm contracts and the external intercostal muscles contract. d. The diaphragm relaxes and the external intercostal muscles relax. e. The diaphragm expands and increases oxygen uptake.
Bacteria in the intestinal tract prevent
pathogens from causing disease by a. crowding them out. b. eating other bacteria. c. producing protein traps to kill them. d. submerging them in acid in the stomach. e. doing all of these.
There are ____________________ autosomes present in a human sperm cell. Fill in the blank(s) with the appropriate word(s)