Question

TRUE OR FALSE please answer all since they are parts of the same one question. No need for explanation just state whether it is true or false

a. In secondary active transport, an ion gradient maintained by an ATPase drives the transport of another substance. For example, the transport of lactose into a cell by lactose permease is driven by the co-transport of H+.

b.. Enzymes catalyze reactions by decreasing the activation free energy, ΔG‡ , which is the free energy required to reach the transition state, the point of highest free energy in the reaction.

c. “Ionophores facilitate ion diffusion by binding an ion, diffusing through the membrane, and then releasing the ion; or by forming a channel.”

d. “Enzymes, almost all of which are proteins, are grouped into two mechanistic classes.”

e. “Reversible inhibitors reduce an enzyme’s activity by binding to the substrate-binding site (competitive inhibition), to the enzyme-substrate complex (uncompetitive inhibition), or to both the enzyme and the enzyme-substrate complex (mixed inhibition).”

Answer 1

1) TRUE - the trasfer of h+ is simultaneouly on to make through the transport of lactose.

2) TRUE - enzyme decreases the activation energy and thus the reaction occurs at a faster rate

3)TRUE - ionophores transfer the ions from one side of the plasma membrane to the other side, ex-valinomycin,nigericin

4)FALSE - the enzymes are classified into 6 forms on the basis of their reactions.

5) TRUE - The reversible inhibition are of three types, competitive , non competitive and uncompetitive.