Consider the steps of glycolysis given in the diagram:  

What is true about reaction 1?
I. Hexokinase is a transferase
II. It acts to keep the glucose concentration low
III. It blocks the glucose from leaking out
1. Only I and II
2. Only I and III
3. Only II and III
4. I, II and III

Consider the steps of glycolysis given in the diagram:

It is advantageous that in reaction 5 DHAP is isomerized to G3P because:
1. G3P has more energy than DHAP
2. DHAP is highly toxic
3. Regulation of the pathway becomes easy
4. DHAP is unstable and breaks down to Acetyl CoA

Consider the latter half of glycolytic pathway given below:

Regarding reaction 7:
I. Glycolysis has reached the break-even point.
II. When the cell has plenty of ATP (and little ADP), this reaction does not occur.
1. Only I is true
2. Only II is true
3. Both I and II are true
4. Both I and II are false

Refer to the schematic diagram of Krebs citric acid cycle given below:

How many of the enzymes involved in the pathway are dehydrogenases?
  
1. 2
2. 3
3. 4
4. 5

The mitochondrial proton gradient would be highest leading to ATP synthesis when the following condition is present:
1. pyruvate (present)-oxygen (present)-ATP levels (high)
2. pyruvate (present)-oxygen (present)-ATP levels (low)
3. pyruvate (present)-oxygen (absent)-ATP levels (high)
4. pyruvate (absent)-oxygen (present)-ATP levels (low)

When the amount of ATP is increased in a cell, it is expected to:
1. inhibit the enzyme phosphofructokinase.
2. activate the enzyme citrate synthase.
3. inhibit the enzyme pyruvate kinase.
4. activate the enzyme pyruvate dehydrogenase.

Brown fat tissue in vertebrate animals:
1.is the most common storage form of fat
2.allows the animals to regulate their metabolic rate when it is especially hot
3.promotes fluidity of the biological membranes
4. regulates temperature by converting energy from NADH oxidation to heat

Refer to the diagram given below:
 

Identify the incorrectly matched pair:

Beta oxidation in respiration is associated with:
1.oxidation of pyruvate
2.activation of acetyl CoA
3.electron transport chain
4. breakdown of fatty acids

Oxidation of organic compounds by molecular oxygen results in the production of carbon dioxide and water and releases free energy. This is because:

1.High energy covalent bonds in organic molecules are broken to produce weaker covalent bonds in water and carbon dioxide.

2. Electrons are being moved from atoms that have a lower affinity for electrons to atoms with a higher affinity for electrons.

3.The electrons in water and carbon dioxide have higher potential energy than the electrons in organic compounds.

4. The covalent bonds in organic molecules are unstable and stable in water and oxygen.