80 which gene expression is blocked in the lac operon system? (if wrong, answer will be reported). 1. the repressor protein destroys the genes required to produce enzymes. 2. lactose binds to the repressor and changes its shape. 3. the repressor protein blocks the genes from making mrna 4. rna polymerase begins transcribing the genes.

Which list shows the levels of organization of an organism in hierarchical order from left to right, from the smallest to the most complex?

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.

Need an answer asap 45 points and brainlest to the first person to answer why do scientific theories, such as biological and chemical evolution, represent the strongest explanation of the changes observed in the fossil record. must be in sentence form how can scientific theories on evolution and the fossil record change over time? must be in sentence form