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 biology multicellular structure: tissue muscle tissue structure of protein muscle tissues

ATP-ase activity is found in

  1. Myosin filament

  2. Actin filament

  3. Both A and B

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

myosin filament is a polymerised protein. Many monomeric proteins, called meromyosin constitute one thick filament. Each meromyosin has two important parts, a globular head with a short arm and a tail, the former being called the heavy meromyosin (HMM) and the latter, the light meromyosin (LMM). The HMM component, i.e., the head and short arm projects outwards at regular distance and angle from each other from the surface of a polymerised myosin filament and are known as the cross arm. The globular head is an active ATPase enzyme and has binding sites for ATP and active sites for actin.

Multiple choice properties of enzyme enzyme properties enzymes biomolecules: chemical constituents of living cells biology

If an enzyme has been given the EC code 3.2.1.7, it is likely to be involved in

  1. Digestin

  2. Redox reaction

  3. Isomerization

  4. Molecular breakdown
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

  • EC number is a numerical classification scheme is based on the chemical reactions which are catalyzed by them. 
  • A system of enzyme nomenclature is associated with a name for the corresponding enzyme. 
  • The number classification can be referred to that enzyme which is involved in digestion.
So, the correct option is 'Digestin'.

Multiple choice photosystems photosynthesis in plants metabolism, cell respiration, and photosynthesis photosynthesis in higher plants biology

Ferredoxin is a constituent of

  1. PS I

  2. PS II

  3. Hill reaction
  4. $P _{680}$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Ferredoxin is the iron-containing, soluble compound in chloroplasts that helps in electron transportation and is the constituent of PS I which asses electrons to reductase complex that helps in the reduction of NADP$^+$ to NADPH which is a strong reducing agent.

So the correct option is 'PS I'.

Multiple choice photosystems photosynthesis in plants metabolism, cell respiration, and photosynthesis photosynthesis in higher plants biology

Ferredoxin is a component of the

  1. PS- I.

  2. PS- II.

  3. Hill reaction.
  4. P$ _{680}$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Ferredoxin is an iron-containing protein, associated with photosystem I. The ferredoxin accepts electrons from photosystem I and passes them to oxidized NADP to form reduced $NADPH _2$. The enzyme responsible for reduction of NADP is called as NADP ferredoxin oxidoreductase.

Multiple choice photosystems photosynthesis in plants metabolism, cell respiration, and photosynthesis photosynthesis in higher plants biology

The biochemical objective of PSI is to 

  1. oxidise $NADPH$
  2. hydrolyse $ATP$
  3. Phosphorylate $ADP$
  4. reduce $NADP^+$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

 The biochemical objective of PSI is to reduce NADP+ to NADPH because NADP+ is able to be reduced in NADPH by gain electron which has been excited from PSI(P700)  and also hydrogen ions from stroma. So electron required to reduce NADP+ is released from PSI so answer is option 4.

Multiple choice biology movement in and out of the cell transport of molecules osmosis and plasmolysis plant water relation

Active transport from outside to inside of molecule across a membrane requires

  1. Cyclic AMP

  2. Acetyl chlorine

  3. ATP

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

Active transport from outside to the inside of molecules across a membrane requires ATP. It is required in transferring solutes across the membrane may be through an ATPase which creates ph gradient across the membrane. Thus, the correct option is C.

Multiple choice biology movement in and out of the cell transport of molecules osmosis and plasmolysis plant water relation

Energy is required for

  1. Active transport

  2. Facilitated transport

  3. Diffusion

  4. All of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
In one form of transport across the cell membrane, called active transport, ATP is utilized. The utilization of an ATP molecule provides the cell with an energy boost which enables the transport of different molecules across the cell membrane.
So, the correct answer is 'Active transport'.
Multiple choice biology movement in and out of the cell transport of molecules osmosis and plasmolysis plant water relation

Choose the correct answer from the alternatives given.
Which of the following processes requires the greatest expenditure of energy by the cell?

  1. Facilitated diffusion

  2. Diffusion

  3. Active transport

  4. Osmosis
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
In one form of transport across the cell membrane, ATP is utilized. The utilization of an ATP molecule provides the cell with an energy boost which enables the transport of different molecules across the cell membrane. This is termed as active transport of molecules across the cell membrane.

So, the correct answer is 'Active transport'.
Multiple choice biology movement in and out of the cell transport of molecules osmosis and plasmolysis plant water relation

Active transport

  1. Releases energy

  2. Requires energy

  3. Produces ATP

  4. Produces a toxic substance
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

There are two types of absorption mechanisms i.e., active and passive transport. Active transport is the movement of solute or solvent molecules against the concentration gradient. It requires the expenditure of energy in the form of ATP. Thus, the correct answer is option B.

Multiple choice biology movement in and out of the cell transport of molecules osmosis and plasmolysis plant water relation

Active transport across cell membrane requires

  1. Glucose

  2. Steroids

  3. Energy in the form ATP

  4. Proteins and glucose
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

In active transport, substances move against a concentration gradient across a cell membrane. Hence energy is required. The energy available in the body in the form of ATP is used to move this substance across the cell membrane. Thus the correct answer is option C.

Multiple choice biology movement in and out of the cell transport of molecules osmosis and plasmolysis plant water relation

Active transport across biomembrane involves

  1. Production of ATP

  2. Requirement of energy

  3. Production of toxin

  4. Release of energy
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
  • Active transport is a process by which molecules move across the cell membrane from a region of low concentration to a region of high concentration against the concentration gradient using energy.
  • This energy requirement is fulfilled by the ATP molecules (metabolic energy).
  • The substances which are transported across the cell membrane by active transport are- Na+, K+, Mg2+, and Ca2+.
  • So, the correct answer is 'Requirement of energy'.
Multiple choice biology movement in and out of the cell transport of molecules osmosis and plasmolysis plant water relation

Which is not true of active transport

  1. It is chemical process

  2. Energy is obtained from ATP

  3. Occurs through carrier molecules

  4. Not modified by enzymes.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Active transport is a physiological or biological process mediated by membrane proteins, not a simple chemical reaction. It relies on ATP, uses carrier proteins, and is highly sensitive to metabolic inhibitors and enzymes that regulate these proteins.

Multiple choice biology movement in and out of the cell transport of molecules osmosis and plasmolysis plant water relation

Active transport is characterised by

  1. Requires special membrane proteins

  2. Highly selective

  3. Requires ATP energy

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
  • Active transport can be defined as the movement of molecules or ions across a plasma membrane from a region of lower concentration (of molecules or ions) to a region of higher concentration, against the concentration gradient. 
  • For this cellular energy is required which is available in the form of ATP molecule and enzymes.
  • So, the correct answer is 'All of the above'.
Multiple choice biology movement in and out of the cell transport of molecules osmosis and plasmolysis plant water relation

Which of the following is an energy dependent process?

  1. Facilitated diffusion

  2. Active transport

  3. Endosmosis

  4. Exosmosis
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Active transport (secretion) is an energy-dependent process that selectively moves a substance against its electrochemical gradient across a cell membrane. It is an energy dependent process, in which ATP is utilised.

Thus the correct option is B.