Light-dependent Reaction

2.

Which photosystem does the light-dependent reaction begin with?

Photosystem I
Photosystem II
Photosystem |||
Photosystem V

Correct Answer

A. Photosystem II

3.

As the excited electrons lose energy along the electron transport chain, they fuel the process of:

Light absorption
Chemiosmosis
Photolysis
Photosynthesis

Correct Answer

A. Chemiosmosis

Explanation

As the excited electrons lose energy along the electron transport chain, they fuel the process of chemiosmosis. Chemiosmosis is the movement of ions across a selectively permeable membrane, which generates ATP (adenosine triphosphate), the energy currency of cells. In this process, the energy released by the flow of electrons is used to pump protons across the membrane, creating an electrochemical gradient. This gradient is then used by ATP synthase to produce ATP. Therefore, chemiosmosis is the correct answer as it accurately describes the process by which the excited electrons contribute to the production of ATP.

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3

4.

What is not found in a photosystem?

Chlorophyll a molecules
Accessory pigments
Antenna complex
Cytochrome complex

Correct Answer

A. Cytochrome complex

Explanation

A photosystem is a complex of pigments and proteins found in the thylakoid membrane of chloroplasts. It is responsible for capturing light energy and converting it into chemical energy during photosynthesis. Chlorophyll a molecules, accessory pigments, and antenna complexes are all components of a photosystem and play a crucial role in light absorption and energy transfer. However, a cytochrome complex is not found in a photosystem. Cytochromes are proteins involved in electron transport chains, which are located in the inner mitochondrial membrane, not in the chloroplasts where photosystems are found.

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16

5.

Light absorbed by photosystem II serves to excite electrons in what molecules?

Chlorophyll b molecules
Chlorophyll a molecules
Accessory pigment molecules
Chlorophyll c molecules

Correct Answer

A. Chlorophyll a molecules

6.

After the excited electrons are captured by the primary electron acceptor, water is split in a process known as what?

Photolysis
Photosynthesis
Photophosphorylation
Chemiosmosis

Correct Answer

A. Photolysis

Explanation

After the excited electrons are captured by the primary electron acceptor, water is split in a process known as photolysis. This is the process where water molecules are broken down into oxygen, protons (H+), and electrons. Photolysis occurs during the light-dependent reactions of photosynthesis, specifically in the thylakoid membrane of chloroplasts. It is an essential step in the production of oxygen and the generation of energy-rich molecules like ATP and NADPH.

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7

7.

After NADP reductase transfers the electron from ferredoxin to NADP+, the NADP+ requires how many electrons so that it can be reduced into NADpH?

1
4
3
2

Correct Answer

A. 2

8.

When photosystem I absorb light and transfers an electron to a primary electron acceptor, an electron from _____________ fills the void.

The cytochrome complex
A chlorophyll a molecule
Antenna complex
Photosystem II

Correct Answer

A. Photosystem II

9.

In which state of photosynthesis is light energy is converted into chemical energy?

First stage
Second stage
Third stage
Fourth stage

Correct Answer

A. First stage

Explanation

In the first stage of photosynthesis, known as the light-dependent reactions, light energy is converted into chemical energy. This occurs in the thylakoid membranes of the chloroplasts, where pigments such as chlorophyll absorb light and use it to generate ATP (adenosine triphosphate) and NADPH (nicotinamide adenine dinucleotide phosphate), which are energy-rich molecules. These molecules are then used in the second stage, the light-independent reactions, to convert carbon dioxide into glucose through a process called the Calvin cycle. Therefore, the correct answer is the first stage.

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1

10.

After the electron from photosystem I is transferred to the primary electron acceptor, it is passed along the electron transport chain by the carrier _____________.

Oxycontin
Cytochrome complex
Ferredoxin
Chloroplast

Correct Answer

A. Ferredoxin

Light-dependent Reaction

What are the products of the light-dependent reaction?

Quiz Preview

Which photosystem does the light-dependent reaction begin with?

As the excited electrons lose energy along the electron transport chain, they fuel the process of:

What is not found in a photosystem?

Light absorbed by photosystem II serves to excite electrons in what molecules?

After the excited electrons are captured by the primary electron acceptor, water is split in a process known as what?

After NADP reductase transfers the electron from ferredoxin to NADP+, the NADP+ requires how many electrons so that it can be reduced into NADpH?

When photosystem I absorb light and transfers an electron to a primary electron acceptor, an electron from _____________ fills the void.

In which state of photosynthesis is light energy is converted into chemical energy?

After the electron from photosystem I is transferred to the primary electron acceptor, it is passed along the electron transport chain by the carrier _____________.