Biology

Cellular Respiration and Enzymes

1,551 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
  1. Energy is stored in the form of ATP

  2. Energy is released and stored in the form of ATP

  3. Energy is used up

  4. Energy is not released at all

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Cellular respiration is the set of metabolic reactions and processes that take place in the cells of organisms to convert biochemical energy from nutrients into adenosine triphosphate (ATP), and then release waste products.

Multiple choice
  1. CoA

  2. DNA

  3. NAD+

  4. ATP

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

NAD+ (Nicotinamide adenine dinucleotide) acts as a coenzyme that functions as a hydrogen acceptor in metabolic redox reactions, becoming NADH in the process.

Multiple choice
  1. time resolved crystallography

  2. X-ray crystallography

  3. racemic crystallography

  4. electron crystallography

Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Time resolved crystallography utilizes X-ray crystallography imaging to visualize reactions in four dimensions (x, y, z and time). This enables the studies of dynamical changes that occur in. For example, enzymes during their catalysis. The time dimension is incorporated by triggering the reaction of interest in the crystal prior to X-ray exposure, and then collecting the diffraction patterns at different time delays.

Multiple choice
  1. substrates

  2. enzymes

  3. hormones

  4. bile juice

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Respiratory pathways are regulated through enzymes that catalyse individual steps of the pathway.

Multiple choice
  1. NAD

  2. NADP

  3. FAD

  4. ATP

  5. -

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

ATP (adenosine triphosphate) is considered by biologists to be the energy currency of life. It is a high-energy molecule that stores the energy.

Multiple choice
  1. Breakdown of glucose

  2. Phosphorylation of glucose

  3. Conversion of glucose into fructose

  4. Dehydrogenation of glucose

  5. -

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

In the first step of glycolysis, the glucose ring is phosphorylated. Phosphorylation is the process of adding a phosphate group to a molecule that is derived from ATP. As a result, at this point in glycolysis, one molecule of ATP is consumed.

Multiple choice
  1. cytoplasm

  2. nucleus

  3. mitochondria

  4. Both 1 and 3

  5. -

Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Glycolysis is the first step in the breakdown of glucose for extracting energy for cellular metabolism. Most living organisms carry out glycolysis as a part of their metabolism. The process does not use oxygen and can also take place under anaerobic conditions. It occurs in cytoplasm.