Biotechnology questions.?

Question

I need to correct my answers from a quiz, to get some make-up points. Any help would be amazing. Please put the correct answers and a sentence explanation of why it is correct.

Restriction enzymes recognize DNA sequences with -
A- Many C's/many G's
B- Parallel nature
C- Twofold dyad symmetry.

Genetic recombination ca occur in bacteria by all of the following EXCEPT
A- Transfer of DNA through pili
B- DNA amplification
C- Mutation
D- Transduction

And the last one is
Regulatory protiens shuto off transcription by ninding to a site directly in front of the promoter, this site is the
A- Suppressor site
B- Operator site
C Regulatory site
D- Transcriptional control site

Answer 1

1. Restriction enzymes recognize DNA sequences with-
C-Twofold dyad symmetry. Restriction Enzymes generally recognize specific DNA sequences which are usually symmetric with respect to each side of the DNA strand

2. Genetic Recombination can occur in bacteria by all of the following EXCEPT
C-Mutation. Recombination implies a crossing over of chromosomes. This is possible in all but mutation.

3. Regulatory proteins shut off transcription by binding to....
A-Suppressor Sites. thats just where they bind i think.