T cells undergo immune selection FOR potential antigen-reactive cells and selection AGAINST those cells that react strongly with self-antigens

Indicate whether the statement is true or false.


Answer: TRUE

Biology & Microbiology

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The dominant physical resources from the sea are:

a. magnesium and iron. b. salt and water. c. gold and copper. d. sulfides and manganese. e. gold and oxygen.

Biology & Microbiology

Which of the following is NOT a factor in

moving blood back to the heart?

a. systolic pressure b. smooth muscle contraction c. skeletal muscle contraction d. one-way valves in veins e. more than one of these is NOT a direct factor in moving blood back to the heart

Biology & Microbiology

Uses of chlorofluorocarbons include all of the following EXCEPT for ____

a. gasoline additives b. air conditioner coolants c. refrigeration coolants d. plastic packaging e. solvents

Biology & Microbiology

In the cell cycle, the G1 phase represents ____

a. the stage of DNA synthesis b. splitting of the chromosomes into chromatids c. a period of growth d. the stage of actual cell division e. the stage just prior to meiosis

Biology & Microbiology