Question

1. Methyl alcohol, also known as wood alcohol, is a common solvent and paint remover. It is poisonous if accidentally swallowed. The enzyme, alcohol dehydrogenase, in the liver converts methyl alcohol into formaldehyde, which then gets converted into a toxic product. Grain alcohol, ethyl alcohol, is also acted upon by alcohol dehydrogenase. One antidote for methyl alcohol poisoning is to provide the patient with ethyl alcohol. This blocks the active site of the enzyme so that it can't bind to and break down the methyl alcohol. In this capacity, the ethyl alcohol is acting as a/an:

Group of answer choices

coenzyme

competitive activator

allosteric regulator

competitive inhibitor

2. Which of the glycolysis enzymes are involved in investing ATP to start glycolysis.

Group of answer choices

only phosphofructokinase

Hexokinase and phospofructokinase

isomerase and hexokinase

only hexokinase

3.

Cyanide inhibits cytochrome c oxidase (the last protein in the electron transportchain) in the mitochondria blocking the electron transfer to oxygen.
If cyanide poisoning occurs, would you expect the H+ ion concentration in the intermembrane space to:

Group of answer choices

fall

stay the same

rise

Answer 1

1. Competitive Inhibitor

Ethyl Alcohol reduces the action of alcohol dehydrogenase on methyl alcohol by binding more effectively to the enzyme and saturating it's activity. This is known as competitive inhibiton.

2. Hexokinase and phosphofructokinase

Glucose is converted to Glucose-6-phosphate in the presence of Hexokinase enzyme and this process 1 ATP is utilised.

Fructose-6-phosphate is converted to Fructose-1.6-bisphosphate in the presence of phosphofructokinase and in the process, 1 ATP is utilised.

3. Fall

After cyanide poisipois, electron transport chain is unable to pump electrons into intermembrane space. Consequently, pH of the intermembrane space would increase ie, H+ concentration decreases. Ultimately, ATP synthesis would stop.