Ciprofloxacin is a type of antibiotic used to treat bacterial infections. It kills bacteria by stopping a bacterial enzyme called DNA-gyrase from working. This enzyme is
involved in replicating the DNA of the bacteria. If eukaryotes had this same enzyme,
what phase of the cell cycle would ciproflaxa cin most likely impact?
Answers
A. S phase
B. Mitosis
C. G1
D. Cytokinesis

step 1: initiation

initiation is the beginning of transcription. it occurs when the enzyme rna polymerase binds to a region of a gene called the promoter. this signals the dna to unwind so the enzyme can ‘‘read’’ the bases in one of the dna strands. the enzyme is now ready to make a strand of mrna with a complementary sequence of bases.

step 2: elongation

elongation is the addition of nucleotides to the mrna strand. rna polymerase reads the unwound dna strand and builds the mrna molecule, using complementary base pairs. there is a brief time during this process when the newly formed rna is bound to the unwound dna. during this process, an adenine (a) in the dna binds to an uracil (u) in the rna.

step 3: termination

termination is the ending of transcription, and occurs when rna polymerase crosses a stop (termination) sequence in the gene. the mrna strand is complete, and it detaches from dna.

meiosis is the first to occur after the nuclei of opposite of opposite mating types fuse

her affection for her parents makes her an especially sympathetic character.

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