Respiratory Substrates

Q.

Define RQ. What is RQ value for fats?

Q.

What are respiratory substrates? Name the most common respiratory substrate.

Q. Which of the following factors affect the rate of respiration?

1. Temperature
2. Oxygen
3. Salts
4. All of the above

Q.

The specific function of light energy during photosynthesis is to

1. Split water
2. Activate chlorophyll
3. Reduce carbon dioxide
4. Synthesize glucose.

Q. What are different classes of enzymes? Explain any two with the type of reaction they catalyse.

Q.

What type of biomolecule is glucose?

Q. Which of the following is NOT an intermediate of TCA Cycle?

1. Acetyl CoA
2. Citrate
3. Succinyl CoA
4. Alpha Ketoglutarate

Q. Which of the following factors affect the rate of respiration?

1. Temperature
2. Oxygen
3. Salts
4. All of the above

Q. The breakdown of C-C bonds of compounds via oxidation in the cells to obtain energy is called ____i____. The compounds that are used for this oxidation are called ____ii____.

1. i - breathing, ii - oxidising agents
2. i - reduction, ii - reducing agents
3. i - respiration,
   ii - respiratory substrates
4. i - photosynthesis,
   ii - photosynthetic substrates

Q. Refer to the reaction and answer the question.

$2\left(C_{51}{H}_{98}{O}_6\right)+145O_2\to$$102{\mathrm{CO}}_2+98H_{2}O+\mathrm{energy}$What is the R.Q of this reaction?

1. 1
2. 0.7
3. 1.45
4. 1.62

Q. Which of the following is the common mode of respiration?

1. Protoplasmic respiration
2. Floating respiration
3. Fermentation
4. Both a and b

Q.

For fatty acids to be able to enter the pathways of cellular respiration, they must be ______.

1. deaminated

2. combined with ATP

3. broken into acetyl groups

4. combined with glycerol

Q. Breakdown of ________ occurs when the body is starving, in order to produce energy.

1. fat
2. carbohydrates
3. organic acids
4. protein

Q. Which of the following substrates liberates the maximum energy?

1. Carbohydrates
2. Fats
3. Proteins
4. Cannot be determined

Q.

Glucose breakdown is ____.

1. coupled with ATP breakdown

2. combined with carbon dioxide to form oxygen plus water

3. an endergonic reaction proceeding from low-energy molecules to high-energy molecules

4. an oxidation-reduction reaction

Q.

Which of the following molecules enters the citric acid cycle, after being broken down to acetyl CoA?

1. proteins

2. amino acids

3. all of the choices are correct

4. fatty acids

Q.

Which of the following will release more energy on oxidation? Arrange them in ascending order.
(a) 1 gm of fat
(b) 1 gm of protein
(c) 1 gm of glucose
(d) 0.5 gm of protein + 0.5 gm glucose

Q.

The R.Q. (Respiratory quotient) of C39 H72 O6 is

1. 0.72

2. 2.71

3. 1.32

4. 3.250

Q.

What are respiratory substrates? Name the most common respiratory substrate.

Q. The physiological value of carbohydrates is

1. 4.0 kcal/g
2. 5.65 kcal/g
3. 4.1 kcal/g
4. 9.0 kcal/g

Q. Respiratory Quotient (RQ) 0.7 belongs to:

1. Carbohydrates
2. Fat
3. Protein
4. Alcohol

Q. Which of the metabolites is common to respiration mediated breakdown of fats, carbohydrates and proteins?

1. Glucose -6 - phosphate
2. Fructose 1, 6-bisphosphate
3. Acetyl CoA
4. Pyruvic acid

Q. Which of the following enzyme is not used in Krebs’ cycle :

1. Furmarase
2. Aconitase
3. Aldolase
4. Decarboxylase

Q. Carbohydrates, proteins, fats and organic acids are the various respiratory substrates. Amongst these which is the most preferred substrate for respiration?

1. Carbohydrates
2. Proteins
3. Organic acid
4. Fats

Q.

Read the assertion and reason carefully to mark the correct option in question.

Assertion: Carbohydrates are more suitable for the production of energy in the body than proteins and fats.

Reason: Carbohydrates can be stored in the tissues as glycogen and can be used for the production of energy, whenever necessary.

1. If both assertion and reason are true but the reason is not the correct explanation of the assertion.

2. If both assertion and reason are true and the reason is the correct explanation of the assertion.

3. If assertion is true but the reason is false.

4. If both assertion and reason are false.

Q. What will be the metabolic fate of pyruvic acid in absence of $O_2$?

1. Partial oxidation will take place
2. Complete oxidation
3. Utilisation for reoxidation of NADH
4. Dependent on energy need

Q. Write R.Q. for carbohydrates, fats and proteins?

Q. how many TCA cycles are required during the complete oxidation of one sucrose molecule

Q. Fe and Mg are essential in plants for

1. Chlorophyll synthesis
2. Energy transfer mechanisms
3. Translocation of carbohydrates
4. Stomatal Opening

Q. Rate of respiration shall

1. Increase with rise in temperature
2. Decrease in the presence of light
3. No change with season and environmental conditions
4. Increase in winter