Dna 1) links together the "sticky ends" of cut dna segments 2)attaches to dna molecules at specific sites and cut both strands of dna at that place 3) only cuts rna molecules at specific sites and cuts both strands of dna at that place 4) is a chemical machine that makes parts of the cell membrane'

The trp operon in e. coli regulates genes that code for enzymes required for synthesis of the repressible operon. when tryptophan is not available amino acid tryptophan. the trp operon is a in the environment, the trp repressor protein activeinactiveregulated. therefore, rna polymerase can bind to the genes to begin transcription.

What is the name for a substance formed in a chemical reaction

How do tides affect the organisms living in intertidal zones? a. no organisms live in intertidal zones due to the tumultuous environment. b. the mechanical forces of the waves keeps the organisms clean. c. only plants live in intertidal zones because the animals float away with the waves and never return. d. the mechanical forces of the waves can dislodge the organisms from their habitat.