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Energy Currency in Biological Systems Quiz

#1

What is the primary energy currency in biological systems?

ATP
Explanation

ATP serves as the primary energy currency in biological systems, storing and transferring energy for cellular activities.

#2

In which step of cellular respiration does substrate-level phosphorylation occur?

Glycolysis
Explanation

Substrate-level phosphorylation occurs during glycolysis, where ATP is directly synthesized by transferring a phosphate group to ADP.

#3

During which stage of cellular respiration is carbon dioxide produced?

Citric acid cycle
Explanation

Carbon dioxide is produced during the citric acid cycle, a stage of cellular respiration where acetyl-CoA is oxidized.

#4

Which molecule serves as an immediate source of energy for muscle contraction?

ATP
Explanation

ATP serves as the immediate source of energy for muscle contraction, releasing energy upon its hydrolysis.

#5

During the Calvin cycle of photosynthesis, what is the initial acceptor of CO2?

Ribulose-1,5-bisphosphate (RuBP)
Explanation

RuBP serves as the initial acceptor of carbon dioxide during the Calvin cycle of photosynthesis, initiating carbon fixation.

#6

In which cellular organelle is ATP produced through oxidative phosphorylation?

Mitochondria
Explanation

ATP is generated through oxidative phosphorylation in the mitochondria during cellular respiration.

#7

What is the chemical formula of ATP (adenosine triphosphate)?

C10H16N5O13P3
Explanation

The chemical formula of ATP is C10H16N5O13P3, reflecting its structure as a nucleotide with three phosphate groups.

#8

Which enzyme is responsible for the synthesis of ATP during chemiosmosis in mitochondria?

ATP synthase
Explanation

ATP synthase is the enzyme that synthesizes ATP during chemiosmosis in the mitochondrial inner membrane.

#9

What is the energy source for the phosphorylation of ADP to form ATP during photosynthesis?

Sunlight
Explanation

Sunlight serves as the energy source for the phosphorylation of ADP to produce ATP during the light-dependent reactions of photosynthesis.

#10

Which molecule carries high-energy electrons to the electron transport chain during glycolysis?

NADH
Explanation

NADH transports high-energy electrons to the electron transport chain, initiating ATP synthesis during glycolysis.

#11

During cellular respiration, which molecule is oxidized to produce ATP?

Glucose
Explanation

Glucose undergoes oxidation during cellular respiration, releasing energy that is used to synthesize ATP.

#12

What is the role of NADH in cellular respiration?

To donate electrons in the electron transport chain
Explanation

NADH functions by donating electrons in the electron transport chain, contributing to ATP synthesis in cellular respiration.

#13

Which of the following processes involves the conversion of light energy into chemical energy in the form of ATP?

Photosynthesis
Explanation

Photosynthesis is the process that converts light energy into chemical energy, producing ATP and other organic molecules.

#14

What is the primary function of coenzyme Q in the electron transport chain?

Donating electrons to oxygen
Explanation

Coenzyme Q plays a crucial role in the electron transport chain by donating electrons to oxygen, the final electron acceptor.

#15

What is the primary function of FADH2 in cellular respiration?

Accepting electrons from NADH
Explanation

FADH2 acts by accepting electrons from NADH, contributing to the electron transport chain and ATP synthesis in cellular respiration.

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