Which of the following statement(s) is/are not true ?
1.One ATP molecule yields 32 kJ of energy.
2.When tripalmitin is used as a substrate, the RQ is 0.7.
3.Energy released by one molecule of glucose on complete oxidation corresponds to 1292 kJ.

only (1)
(2) and (3)
(1) and (3)
Only (2)

Which of the following may be used as respiratory substrates?
1.Fats
2.Carbohydrates
3.Proteins
4.Nucleic acid

(1), (2) and (3)
(1) and (2)
(2) and (4)
(1) and (3)

Match Column – I with Column – II

Column – I	Column – II
A.EMP pathway	1.Mitochondrial matrix
B.TCA cycle	2.Cytoplasm
C.ETC	3.Inner mitochondrial membrane

1 2 3
2 1 3
2 3 1
3 2 1

Match Column – I with Column – II

Column – I	Column – II
A.4C Compound	1.Acetyl CoA
B.2C Compound	2.Pyruvate
C.5C Compound	3.Citric acid
D.3C Compound	4.a-ketoglutaric acid
	5.Malic acid

A→(2); B→(5); C→(3); D→(1)
A→(5); B→(1); C→(4); D→(2)
A→(3); B→(1); C→(4); D→(2)
A→(5); B→(3); C→(1); D→(2)

The diagram shows some of the reactions following glycolysis during aerobic respiration.

How many carbon atoms are in each of the substances S, T and U?

S T U

2 5 3
S T U

2 6 4
S T U

3 4 6
S T U

3 6 4

S	T	U
2	5	3

S	T	U
2	6	4

S	T	U
3	4	6

S	T	U
3	6	4

Solution

Pyruvate is a three-carbon compound. Oxaloacetate, a four-carbon compound, combines with acetyl coenzyme A (two-carbon)to form citrate, a six-carbon compound.

Which graph represents the relationship between the relative energy intake of a person and temperature over a range of environmental temperatures from – 40°C to +38°C?

Solution

At lower temperatures, there is a need for a higher relative energy intake in order to carry on his metabolic processes and to generate heat in his body for enzyme activities.This need decreases as the temperature increases.

The diagram shows the reversible conversion of pyruvate to lactate by the enzyme lactate dehydrogenase.

What would be the effect of inhibition of lactate dehydrogenase in a mammalian cell under anaerobic conditions?

A decrease in cell pH,due to the accumulation of lactic acid.
A decrease in glycolysis, due to the lack of NAD.
An increase in ATP production, due to increased amounts of reduced NAD.
An increase in the activity of the Krebs cycle, due to increased amounts of pyruvate.

Solution

One of the functions of the electron transport chain and the conversion of pyruvate to lactate is the regeneration of NAD from reduced NAD. NAD is needed in glycolysis.

The diagram summarises the pathway of glucose breakdown

When two steps result in a net increase of ATP?

A and C
A and D
B and D
B and E

Solution

ATP formation occurs both at 2, where glyceraldehyde-3-phosphate is converted to pyruvate; and at 5, where the six-carbon compound, citrate,releases water and CO₂ in the Krebs cycle.

The given figure shows the fate of glucose during aerobic and anaerobic respiration. Identify the end products that are formed at stages indicated as A, B,C and D. Identify the correct option from those given below.

A = ETS, B= pyruvic acid, C= ethyl alcohol and carbondioxide, D = lactic acid.
A= glycolysis, B = carbon dioxide and water,C = bacteria, D = ethyl alcohol and carbon dioxide.
A= pyruvic acid, B = carbon dioxide and water,C = ethyl alcohol and lactic acid, D = fungi.
A = ETS, B= ethyl alcohol and carbon dioxide,C = lactic acid, D = carbon dioxide and water.

The graph shows the relation between light intensity and the giving off and taking up of carbon dioxide by the leaves of a plant. Why is most carbon dioxide given off when the light intensity is zero unit?

Because it is just the start of the experiment.
Only respiration is taking place at this intensity of light.
Only photosynthesis is taking place at this intensity of light.
The rate of photosynthesis is equivalent to the rate of respiration.

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