30 points! When is gene expression blocked in the lac operon system?

The repressor protein destroys the genes required to produce enzymes.

The repressor protein blocks the genes from making mRNA.

Lactose binds to the repressor and changes its shape.

RNA polymerase begins transcribing the genes.

Amylase is an enzyme found in the human digestive system. why do you think it was important to keep the enzyme temperature about 37 degrees celsius (98.6 degrees f)? describe what might happened the temperature decreased by 10 degrees celsius.

How many chromosomes are in a gold fish?

In a classic experiment using pea shape, mendel conducted two separate genetic crosses. in the first cross the parent plants were “true breeding” for pea shape; one had round peas ( r )and the other had wrinkled (r). the first cross produced a filial 1 generation of all round peas. in the second cross, mendel bred plants from the filial 1 generation. this cross produced different results. out of approximately 1000 plants, about 75% were round and 25% were wrinkled.