Acts as an on/off switch on the lac operon a. operator b. promoter c. regulator

Question

Acts as an on/off switch on the lac operon a. operator b. promoter c. regulator d. repressor The first leukocyte to arrive at the site of an infection a. basophil b. lymphocyte c. neutrophil d. monocyte What is the appropriate response when antigen is presented by MHC class II molecules? a. an effector CD8 cell should kill the presenting cell b. an effector CD4 cell should kill the presenting cell c. an effector CD8 cell should activate the presenting cell d. an effector CD4 cell should activate the presenting cell Conversion of glucose into ethanol or lactic acid is called a. fermentation b. electron transport c. glycolysis d. all of these Chemiosmosis a. is the movement of protons across a membrane resulting in ATP production b. is the movement of water along the cytochrome system with resulting ATP production c. produces fewer ATPs than anaerobic respiration d. all of these Which of the following is an anabolic reaction a. the breakdown of proteins

Explanation / Answer

1) repressor.

2) neutrophil

3) an effector CD4 cell should activate the presenting cells.

4) fermentation.

5) is the movement of protons across a membrane resulting in ATP production.

6) synthesis of RNA from nucleotide.

7) electron transport system.

8) sabin polio immunization.

9) antibiotics.

10) penicillin

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