Which of the following genotypes and conditions will have the HIGHEST level of trp operon expression? trpR^- / tryptopnan present
trp^+ / tryptophan present
trpP^-/ tryptopnan absent
trpL^- / tryptopnan present
trp^+ Jtryptophan absent

Which phase of the cell cycle ensures that identical copies of the dna are made for daughter cells?

How many chromosomes does each human cell contain? a. 23 chromosomes b. 26 chromosomes c. 43 chromosomes d. 46 chromosomes

Which best describes a benefit of using dna technology in medicine? a) medicine can be produced in mass quantities. b) medicine can be distributed at a reduced cost. c) medicines have fewer side effects. d) medicines are resistant to antibiotics.