In order for transcription of the lac operon genes to take place, what must happen?

the repressor protein binds to the promoter sequence.

the repressor protein binds to the dna molecule, and rna polymerase falls off.

the repressor protein falls off the dna molecule, and rna polymerase binds to the promoter.

lactose is removed from the system.

Hedgerows have created a new ecosystem within britain’s a. farms b. cities c. forests d. industrial areas

Which of these is true of the cytoplasm of an unfertilized egg? a. it is an unevenly distributed mixture of mrna, proteins, organelles, and other substances. b. it does not contain substances that are important in directing development. c. these substances are supplied by the sperm. d. it does not contain substances that are important in directing development. e. development is directed solely by the surrounding cells. f. it is a homogeneous mixture of mrna, proteins, organelles, and other substances. g. it does not contain substances that are important in directing development. h. these substances are produced by the dna of the fertilized zygote.

Each nephron is made up of capillaries that form the __ sweat glands bladder glomerulus ureter