<u>Answer:</u> The molarity of 
ions in the solution is 0.306 M
<u>Explanation:</u>
To calculate the molarity of solution, we use the equation:
We are given:
Mass of solute 
= 15.6 g
Molar mass of = 295.6 g/mol
Volume of solution = 345 mL
Putting values in above equation, we get:
As, 1 mole of produces 1 mole of copper (II) ions and 2 moles of nitrate ions.
So, molarity of ions = (2 × 0.153) = 0.306 M
Hence, the molarity of ions in the solution is 0.306 M
Answer: False
Explanation:
The repression of lac operon is mediated by the catabolite activator protein (CAP). The RNA polymerase can attach to promoter site, only when CAP combined with cAMP is available. Bacteria only accumulate cAMP only when starved. But when glucose is present, cAMP is not available and so CAP-cAMP is not formed. Hence the lac structural genes is turned off in the present of glucose.
Therefore the mechanism by which glucose inhibits the expression of the lac structural genes is by catabolite repression.
Whereas the process by which lactose stimulates the expression of lac operon is by derepression/allosteric regulation. Lactose binds to the lac repressor and deactivate it by causing it to change shape so it doesn't bind to the DNA
It is necessary to add the bleach rapidly because the chemical reaction will occur rapidly. In order to get all of the bleach to interact with the other substance as a whole and not in part, it is necessary to add everything in a very rapid manner, otherwise the amount of the other chemical may not have enough time to properly interact with all of the bleach.
