Biology

Cellular Respiration and Enzymes

1,721 Questions

Explore key concepts of cellular respiration, including glycolysis, the Krebs cycle, and the electron transport chain. These questions also cover ATP production, anaerobic respiration, and essential metabolic pathways. This topic forms a core part of the biology syllabus for many competitive examinations.

Glycolysis and metabolic pathwaysKrebs cycle processesElectron transport chainATP production countAnaerobic respiration products

Cellular Respiration and Enzymes Questions

Multiple choice botany water absorption and ascent of sap in plants active transport and passive transport types of plant transport atp

ATP is required for

  1. Active process

  2. Passive process

  3. All types of processes

  4. None of the above.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Active transport processes move substances against their concentration gradient, which requires energy in the form of ATP. Passive processes, such as diffusion or osmosis, occur spontaneously without the expenditure of metabolic energy.

Multiple choice botany water absorption and ascent of sap in plants active transport and passive transport types of plant transport atp

Which of the following shows that metabolic energy is required in the absorption of ions

  1. More ions absorption in presence of oxygen

  2. Less absorption of ions in presence of oxygen

  3. More ions absorption in presence of ATP

  4. More ions absorption in presence of NAD
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The absorption of ions, involving use of metabolic energy is called active absorption. Energy is generally obtained from ATP.Therefore active absorption is linked to hydrolysis of ATP

Multiple choice botany water absorption and ascent of sap in plants active transport and passive transport types of plant transport atp

Choose the correct answer from the alternatives given.
Active transport from outside to inside of molecules across a membrane requires:

  1. cyclic AMP

  2. acetyl chlorine

  3. ATP

  4. lecithin
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Active transport, which is the movement of ions or molecules across a cell membrane in the direction opposite that of diffusion, that is, from an area of lower concentration to one of higher concentration, requires the assistance of a type of protein called a carrier protein, using energy supplied by ATP. So, the correct option is 'ATP'.

Multiple choice biology respiration in living organisms breathing in plants mode of respiration in plants process of respiration

C6H12O6 + 6O2 → 6CO2 + 6H2O+ ATP
The given equation indicates which of the following activities in plants?

  1. Digestion

  2. Respiration

  3. Transpiration

  4. None of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Aerobic respiration takes place in the mitochondria and requires oxygen and glucose, and produces carbon dioxide, water, and energy. The chemical equation is 

C6H12O6 + 6O2 → 6CO2 + 6H2O+ ATP (glucose + oxygen -> carbon dioxide + water + ATP).
So, the correct option is 'Respiration'.

Multiple choice biology respiration in living organisms breathing in plants mode of respiration in plants process of respiration

Which of the following is the respiratory product in plants?

  1. Glucose

  2. Carbon dioxide

  3. Oxygen

  4. None of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The process by which cells obtain chemical energy by the consumption of oxygen and the release of carbon dioxide is known as respiration. In order to carry on respiration, plant cells need oxygen and a means of disposing of carbon dioxide just as animal cells do. In plants, each part such as root, stem performs respiration because plants do not possess any specialized organs like animals for the exchange of gases. 

Glucose + Oxygen → Carbon Dioxide + Water (+ Energy)We can conclude same from the above equation as well that respiration uses oxygen and produces carbon dioxide.

So, the correct option is 'Carbon dioxide'.

Multiple choice biology respiration in living organisms breathing in plants mode of respiration in plants process of respiration

During respiration in plants, the glucose is broken down into 

  1. Carbon dioxide

  2. Water

  3. Energy

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The process by which cells obtain chemical energy by the consumption of oxygen and the release of carbon dioxide is known as respiration. In order to carry on respiration, plant cells need oxygen and a means of disposing of carbon dioxide just as animal cells do. In plants, each part such as root, stem performs respiration because plants do not possess any specialized organs like animals for the exchange of gases.

The process of respiration is expressed as:

Glucose + Oxygen → Carbon Dioxide + Water (+ Energy)

So, the correct option is 'All of the above'.

Multiple choice biology respiration in living organisms breathing in plants mode of respiration in plants process of respiration

Consider the following statements.
a. Acetaldehyde is an electron acceptor during respiration
b. In Critic Acid Cycle, pyruvate is transported from cytosol to mitochondrial matrix
c. The Pentose Phosphate Pathway occurs in cytosol
Which of these statements are correct?

  1. $1, 2$ and $3$
  2. $1$ and $2$
  3. $2$ and $3$
  4. $1$ and $3$
Reveal answer Fill a bubble to check yourself
A Correct answer
Multiple choice biology concept of life living organism living vs nonliving living vs non living

Growth occurs when 

  1. Anabolism is higher than catabolism

  2. Catabolism is higher than anabolism

  3. Protoplasmic synthesis is more than apoplasmatic synthesis

  4. Apoplasmatic synthesis is more than protoplasmic synthesis
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Growth occurs when the anabolic (Constructive activities) exceed the catabolic activities (destructive activities).

So the correct option is A.

Multiple choice biology concept of life living organism living vs nonliving living vs non living

Growth occurs when

  1. Anabolism is higher than catobolism

  2. Catabolism is higher than anabolism

  3. Protoplasmic synthesis is more than apoplasmatic synthesis

  4. Apoplasmatic synthesis is more than protoplasmic synthesis
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The irreversible permanent increase in size, volume or weight of the body is called Growth. It is the cumulative effect of cell division, cell elongation and cell differentiation. During growth, in the cells, rate of metabolism is high. So, synthesis and breakdown of biomolecules takes place. In this synthesis of biomolecules is higher than breakdown of biomolecules. So the rate of anabolism is greater than catabolism.

So, correct option is ‘Anabolism is higher than catabolism’.

Multiple choice factors affecting respiration living organisms and energy production life processes in living organisms- part 1 respiration biology

Consider the following statements w.r.t. respiration 
a. Cyt-b is a mobile electron carrier
b. $CO _2$ is end product of all types of respiration
c. Five atoms of oxygen are required for complete oxidation of one molecule of pyruvate
d. Conversion of succinate to fumarate produces a reduced coenzyme.

  1. a & c are incorrect

  2. Only d is correct

  3. a & d are correct

  4. b & d are correct
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Cyt-b is part of ETS which act as an electron carrier and formation of ATP whereas CO$ _2$ is the only end product of anaerobic respiration. conversion from succinate to fumarate produces a reduced coenzyme known as succinate dehydrogenase (SDH) or succinate-coenzyme Q reductase (SQR).

So the correct option is 'a & c are incorrect'

Multiple choice factors affecting respiration living organisms and energy production life processes in living organisms- part 1 respiration biology


For aerobic respiration to occur

  1. Pyruvate must be transported to the mitochondrion

  2. Oxygen must be available to the mitochondrion

  3. Hydrogen ions released from the breakdown of pyruvate must be carried to the electron transport system

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

  • Aerobic respiration is the process that takes place in the presence of oxygen.
  • The first part of the process is where the molecule of glucose is broken down to 2 molecules of pyruvate by the process of glycolysis
  • These pyruvate molecules are to enter the mitochondria to under go the reaction of kerb cycle, but the molecule of pyruvate itself cannot enter the mitochondria, it is converted to acetyl CoA so that it can enter inside the mitochondrion membrane.
  • After the kerb cycle molecules of NADH and $FADH _2$are formed which enter the ETS and undergo oxidative phosphorylation.
  • Hydrogen ions are released from the NADH and $FADH _2$ molecules which are transported from inner membrane of mitochondria to the intermembrane matrix of mitochondria, this builds a concentration gradient across the membrane. Also the hydron ions and the electrons that are transported by the complexs of the ETS are in the end accepted by the oxygen molecule forming water that is why it is known as oxidative phosphorylation
  • The concentration gradient that is made is used for the transport of hydronium ions across the ATP synthase complex of the inner mitochrondrial membrane. 
  • With the transport of 2 hydrogen ions one molecule of ATP is formed.
  • Thus glycolysis which takes place in cytoplasm, Kerb cycle that takes place in mitochondria , oxidative phosphorylation and chemisomotic phosphorylation are the parts of aerobic respiration.
  • Therefore the answer 'All of the above' is correct.

















Multiple choice botany photosynthesis action spectrum and absorption spectrum spectrum of electromagnetic radiation chloroplast and pigments of photosynthesis site of photosynthesis
For NADPH + $ H^{+}$ formation 

  1. only PS I is required

  2. only PS II is required

  3. both PS I and PS II are required

  4. only stroma is required
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
NADPH is formed during non-cyclic photophosphorylation wherein both PSI and PS II are involved. 
So, the correct answer is 'both PS I and PS II are required'
Multiple choice chemistry the s-block elements (alkali and alkaline earth metals) biological importance of sodium and potassium biological importance of elements biological importance of s block elements biological importance of magnesium and calcium

Which of the following element participate in oxidation of glucose to form ATP?

  1. Calcium

  2. Sodium

  3. Magnesium

  4. Potassium
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
Option $(D)$ is correct.
Potassium participates in the oxidation of glucose to form ATP through  ATP-sensitive potassium channel. 
Multiple choice spectrophotometer, colorimeter and biosensor biochemical techniques bio-chemistry

At what speed, the mitochondria can be separated out by differential centrifugation?

  1. $200\times $g
  2. $500\times $ g
  3. $800\times$g
  4. $8000\times$g
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Mitochondria are relatively large organelles that sediment at intermediate speeds, typically around 8,000g to 10,000g in a differential centrifugation protocol.