Which best describes conjugation in bacteria? O A. Bacteria take DNA from their environment.
O B. Bacteria transfer DNA with a bacteriophage.
O C. Bacteria switch to the lysogenic cycle.
D. Bacteria inject DNA into another cell.

The scheme below is from a series of reactions that are part of a synthesis of vitamin a. answer the following questions with reference to this scheme. (i) what is "reagent a"? (ii) draw a step-by-step mechanism which explains the formation of compound c from compound b (iii) which reagents would you use to form compound e from compounds c and d (reagents b and c)? for each reagent suggested above in (ii) explain the role of the reagent in the reaction to (iv) form compound e. you may wish to do this by drawing a mechanism. 1. addition of reagent a но reagent a 2. н,о" thо oh нон-с compound a. compound b. compound c .ch-оh 1. reagent b "сно 2. reagent c сh oh compound e. compound d.

To calculate percent by mass, use the equation below: calculate the percent by mass of each element. %n = % %h = % %o = %

What is the effect of returning nuclear reactor cooling water back into bodies of water?