21. The \"natural\" function of restriction endonucleases is to (2 pt) a. protec

Question

21. The "natural" function of restriction endonucleases is to (2 pt) a. protect bacterial cells from invasion by viruses (bacteriophages) b. help bacteriophages infect cells. c. regulate gene expression from specific promoters d. remove chromatin from histones. e. All of the above 22. The standard state usually used in biochemistry (AG") includes2 pt) a. all concentrations at 1 M. b. all concentrations at 1 M, except for [H'], which is 10 -M c. Pure liquids. d. Pure liquids at 1 atm. e. None of the above 23. The production of larger molecules from smaller ones is called (2 pt) a. metabolism. b. catabolism. d. none of these 24. In general, catabolism(2 pt) a. is an oxidative process that releases energy b. is a reductive process that releases energy c. is an oxidative process that requires energy d. is a reductive process that requires energy e. None of the above 5. What does "oxidation" refers too? (2 pt) a. the loss of oxygen. b. the gain of oxygen. c. the loss of electrons. d. the gain of electrons. e. None of the above.

Explanation / Answer

21. a.protect bacterial cells from invasion of viruses(bacteriphage)

22.b.all concentrations at 1 M except for H+,which is 10^-7 M

23.c.anabolism

24.a.in an oxidative process that releases energy.

25.c.loss of electron

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