To my knowledge, the answer is B
Answer:
The lac repressor is not bound to the operon.
Explanation:
The lac repressor is a protein encoded by the lac I gene. In absence of lactose, the lac repressor binds to the operator sequence of the lac operon and does not allow the RNA polymerase to express the operon. However, as lactose enters the cell from the medium, the beta-galactosidase enzyme converts it into allolactose which in turn serves as an inducer of the lac operon. Binding of allolactose to lac repressor trigger conformational changes in the protein and renders it unable to bind to the operator. The RNA polymerase is allowed to express the operon.
im thinking its a chemical change cause a new substance is formed
<h2>Option C is correct</h2>
Explanation:
Natural selection in an aquatic environment resulted in significant changes to whale forelimb anatomy
- Natural selection is the concept of evolution where organisms with favorable traits are selected(by nature) and reproduced and this process allows the organisms to adapt to the changing environmental conditions
- The upper forelimbs of humans and bats have fairly similar skeletal structures which means that they might share a common ancestor in skeletal structure but are functionally different which means they share a homology with each other
- The evolution of limbs of whales is also a part of forelimb adaptive evolution
- Gene mutation rates of higher animals are pretty much similar
- Whales are proper mammals and form a connecting link between fish and mammals
Cooperative brood care (including care of offspring from other individuals), overlapping generations within colony of adults, and division of labor into reproductive and non reproductive groups.
