Honors Biology: Photosynthesis Quiz!

2.

In the light-dependent reactions:

Carbon dioxide is fixed
ATP and NADPH form
Carbon dioxide accepts electrons
Sugar phosphates form

Correct Answer

A. ATP and NADPH form

Explanation

In the light-dependent reactions of photosynthesis, ATP and NADPH form. This is because during this phase, light energy is absorbed by chlorophyll molecules in the thylakoid membranes of the chloroplasts. This energy is then used to generate ATP through a process called photophosphorylation, where ADP is phosphorylated to form ATP. Additionally, NADP+ molecules are reduced to form NADPH, which serves as a carrier of high-energy electrons. These ATP and NADPH molecules are subsequently used in the light-independent reactions (Calvin cycle) to fix carbon dioxide and produce sugar phosphates.

Rate this question:

6

3.

The oxygen released during photosynthesis comes from the:

Splitting of water molecules
Splitting of carbon dioxide molecules
Formation of ATP
Formation of glucose
Combination of oxygen atoms and high-energy electrons

Correct Answer

A. Splitting of water molecules

Explanation

During photosynthesis, plants use sunlight to convert carbon dioxide and water into glucose and oxygen. The oxygen released in this process comes from the splitting of water molecules. Through a series of complex reactions, the energy from sunlight is used to break down water molecules into oxygen, hydrogen ions, and electrons. The oxygen is then released as a byproduct, while the hydrogen ions and electrons are used in the formation of glucose. Therefore, the correct answer is the splitting of water molecules.

Rate this question:

11

4.

Photosystems are functional pigment groups located on the:

Proteins of the plasma membrane
Membranes of the thylakoids
In the stroma of the chloroplasts
In the fluids of vacuoles

Correct Answer

A. Membranes of the thylakoids

Explanation

Photosystems are functional pigment groups that are responsible for capturing light energy during photosynthesis. They are located on the membranes of the thylakoids, which are flattened sacs found within the chloroplasts. The thylakoid membranes contain the necessary pigments, such as chlorophyll, to absorb light and convert it into chemical energy. This energy is then used to drive the synthesis of ATP and the production of NADPH, which are essential for the light-dependent reactions of photosynthesis. Therefore, the correct answer is "membranes of the thylakoids".

Rate this question:

8

5.

Which of the following is a product of the Calvin cycle?

Carbon dioxide
NADP+
Oxygen
FADH2

Correct Answer

A. NADP+

Explanation

NADP+ is a product of the Calvin cycle. The Calvin cycle is a series of reactions that occur in the stroma of chloroplasts during photosynthesis. It is responsible for converting carbon dioxide into glucose. NADP+ is an electron carrier molecule that accepts electrons and hydrogen ions during the light-dependent reactions of photosynthesis. These electrons and hydrogen ions are then used in the Calvin cycle to convert carbon dioxide into glucose. Therefore, NADP+ is a product of the Calvin cycle.

Rate this question:

5

6.

The C4 pathway occurs in plants that are adapted to:

Freshwater habitats
Arctic environments
Areas with a large amount of shade
Conditions of low moisture and intense sunlight
Marine and brackish water habitats

Correct Answer

A. Conditions of low moisture and intense sunlight

Explanation

The C4 pathway is an adaptation in plants that allows them to efficiently perform photosynthesis in conditions of low moisture and intense sunlight. In these environments, plants need to minimize water loss while maximizing their ability to capture and use sunlight for energy. The C4 pathway helps achieve this by concentrating carbon dioxide in specialized cells, which reduces the need for the stomata (pores on the plant's surface) to be open for extended periods. This reduces water loss through transpiration. Additionally, the C4 pathway allows plants to efficiently convert sunlight into energy, even under intense sunlight conditions.

Rate this question:

7.

The light-dependent reactions of photosynthesis:

Do not always require light energy
Are associated with the thylakoids of the chloroplasts
Take place in the stroma of the chloroplasts
Use ATP to produce glucose
Require a source of carbon dioxide

Correct Answer

A. Are associated with the thylakoids of the chloroplasts

Explanation

The light-dependent reactions of photosynthesis are associated with the thylakoids of the chloroplasts. This is because the thylakoids contain the pigments, such as chlorophyll, that absorb light energy. During the light-dependent reactions, these pigments capture light energy and convert it into chemical energy in the form of ATP and NADPH. This energy is then used in the subsequent reactions of photosynthesis to produce glucose. Therefore, the thylakoids play a crucial role in capturing and converting light energy into chemical energy.

Rate this question:

6

8.

In the light-independent reactions:

Carbon dioxide is fixed in organic molecules
Energy in the form of ATP is used
NADPH is required
Glucose is formed
All of these

Correct Answer

A. All of these

Explanation

In the light-independent reactions, all of the mentioned processes occur. Carbon dioxide is fixed in organic molecules, meaning it is converted into a usable form for the plant. Energy in the form of ATP is used to power the reactions and NADPH is required as a reducing agent. Ultimately, these reactions lead to the formation of glucose, which is an important energy source for the plant. Therefore, all of these processes occur in the light-independent reactions.

Rate this question:

3

9.

In noncyclic electron flow, electrons that leave the chlorophyll:

Return to the chlorophyll
Are used to turn NADP+ into NADPH
Produce only ATP
Are channeled to the light-independent reactions by carbon dioxide
Are used to split water molecules

Correct Answer

A. Are used to turn NADP+ into NADPH

Explanation

Noncyclic means non-cycle

Rate this question:

4

10.

In the C3 cycle, carbon dioxide is combined with:

RuBP
Oxaloacetate
PGA
Phosophoglycolate
Acetyl-CoA

Correct Answer

A. RuBP

Explanation

In the C3 cycle, carbon dioxide is combined with RuBP (ribulose-1,5-bisphosphate). This combination is catalyzed by the enzyme Rubisco (ribulose-1,5-bisphosphate carboxylase/oxygenase) to form PGA (3-phosphoglycerate). RuBP acts as a acceptor molecule for carbon dioxide and serves as the starting point for carbon fixation in photosynthesis.

Rate this question:

3

11.

In which of the following structures do the light-independent reactions take place?

Nucleus
Matrix
Thylakoids
Stroma
Cristae

Correct Answer

A. Stroma

Explanation

The light-independent reactions, also known as the Calvin cycle, take place in the stroma of the chloroplasts. The stroma is the fluid-filled space surrounding the thylakoids, where the light-dependent reactions occur. In the light-independent reactions, carbon dioxide is converted into glucose using the energy from ATP and NADPH produced in the light-dependent reactions. The stroma provides the necessary enzymes and other molecules required for this process to occur. Therefore, the correct answer is stroma.

Rate this question:

2

12.

RuBP...

Begins the Calvin cycle
Functions as an enzyme
Breaks into two equal parts
Is a 6-carbon sugar

Correct Answer

A. Begins the Calvin cycle

Explanation

Remember, RuBP must join with a CO2 before it can break into two equal parts.

Rate this question:

13

13.

During photorespiration, Oxygen binds to

Phosphoglyxerate
RuBP
Malate
Carbon Dioxide

Correct Answer

A. RuBP

Explanation

During photorespiration, oxygen binds to RuBP (ribulose-1,5-bisphosphate). This process occurs when the concentration of carbon dioxide is low and oxygen levels are high. Oxygen competes with carbon dioxide for the active site of the enzyme RuBisCO, resulting in the binding of oxygen to RuBP instead of carbon dioxide. This leads to the formation of a two-carbon compound called phosphoglycolate, which is then converted into glycolate and further metabolized in the peroxisomes and mitochondria. This process is energetically costly and reduces the efficiency of photosynthesis.

Rate this question:

9

14.

In the photosynthetic reaction center:

Water is split
Carbon dioxide is fixed
ATP is produced
Electrons are energized
All of these

Correct Answer

A. Electrons are energized

Explanation

Yes, water is split in the photosystem, but not in the reaction center!

Rate this question:

4

Honors Biology: Photosynthesis Quiz!

The green pigment in plants that is capable of absorbing the sun's energy is:

Quiz Preview

In the light-dependent reactions:

The oxygen released during photosynthesis comes from the:

Photosystems are functional pigment groups located on the:

Which of the following is a product of the Calvin cycle?

The C4 pathway occurs in plants that are adapted to:

The light-dependent reactions of photosynthesis:

In the light-independent reactions:

In noncyclic electron flow, electrons that leave the chlorophyll:

In the C3 cycle, carbon dioxide is combined with:

In which of the following structures do the light-independent reactions take place?

RuBP...

During photorespiration, Oxygen binds to

In the photosynthetic reaction center: