Question

Which one of the following statements holds true for the induced-fit model?

1.Once the enzyme binds to the specific substrate molecule, no structural changes can occur in the active site of the enzyme.

2.Once the enzyme binds to the specific substrate molecule, structural changes can occur in the active site to accomodate the product.

3.Once the enzyme binds to the specific substrate molecule, subtle structure changes occur in the active site, which are reverted when the reaction is over.

Answer 1

theres no model!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Answer 2

a) true cytochromes in mitochondria fit the description here. (have Fe)
b) false - top of the hill
c) false - it is a defined orientation and shape.
d) in general false but true in some cases - so TRUE I guess - I don't like how question is worded. I would have prefered the alternative wording "SOME enzymes can act as acids and bases....."

I modify my answer d) - it was semanitcs. Yes SOME enzymes can act as acids and bases and only "turn on" at specific pHs. If the question is ALL enzymes the answer is false. I still do not like the wording of the question