1. Synthesis of an enzyme coded by a repressible gene is stopped by the a. trans

Question

1.

Synthesis of an enzyme coded by a repressible gene is stopped by the

                    a. transformation of the bacteria.

                    b. accumulation of product that the enzyme catalyzes the production of.

                    c. catabolism of the product.                  

                    d. RNA polymerase binding to the repressor.

2.Which nitrogenous base would only be found in RNA?

                    a. adenine                                                                        b. thymine

                    c. cytosine                                                           d. guanine

                    e. uracil

3.An enzyme that unwinds DNA strands so that each strand can be replicated is

                    a. RNA polymerase.                                            b. DNA ligase       

                    c. DNA helicase.                                                  d. DNA polymerase.

Explanation / Answer

1) Option b is correct. Synthesis of an enzyme coded by a repressible gene is stopped by the accumulation of product that the enzyme catalyzes the production of.

2) Option e is correct Uracil is found in the RNA as uracil is energetically less expensive to produce than thymine

3) Option c is correct DNA helicase breaks hydrogen bonds between the paired bases and unwinds the double helix

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