Question

When the protein gramicidin is integrated into a membrane, an H channel forms and the membrane becomes very permeable to protons (H ions). If gramicidin is added to an actively respiring muscle cell, how would it affect the rates of electron transport, proton pumping, and ATP synthesis in oxidative phosphorylation?

a.remains the same
b.proton pumping rate
c.electron transport rate
d.rate of oxygen uptake

Answer 1

c.electron transport rate

Step-by-step explanation:

Gramicidin is a substance which blocks the production of ATP by inhibiting oxidative phosphorylation and glycolysis process occurs in the process of cellular respiration, responsible for the reduction of energy and cell death also occurs. Oxidative phosphorylation is a process in which ATP molecules are formed by the transfer of electrons from NADH to oxygen. This process occurs in the mitochondria of the cell in the availability of oxygen where ATP production occurs. so electron rate is greatly affected and low amount of ATP are produced.

Answer 2

The rates of electron transport, proton pumping, remains the same.

There is a decrease in the rate of ATP synthesis in Oxidative Phosphorylation.

Step-by-step explanation:

Gramicidin is a proteinous (peptide) that forms spores. Gramicidin causes a series of harmful actions when it comes in contact with a membrane.

When Gramicidin comes in contact with or it is integrated into the membrane of an actively respiring membrane, the permeability of the membrane increases such that it begins to lose protons causing the production of ATP( Adenosine Triphosphate) in the muscles during oxidative phosphorylation to cease.

Although, the rates of electron transport remains the same and the pumping of protons remains the same.