Chapter 7 Photosynthesis

Place these events in the correct order as they would occur in the production of ATP fueled by the energy collected by photosystem II. Begin with the first event to occur at the top of the list. Instructions Choice 1 of 3. Hydrogen ions flow through ATP synthase. Choice 2 of 3. A hydrogen ion gradient is established. Choice 3 of 3. Electrons pass along the electron transport chain.

3 2 1

Which of these best describes the component of a photosystem?

A pigment complex and an electron acceptor

G3P is the product of the Calvin cycle and the first reactant in many metabolic reactions in a plant cell leading to the production of which other molecules?

Amino acids Fatty acids Sucrose Glucose phosphate

The stomata of a plant allow _________ _______ The stomata of a plant allow

Blank 1: carbon Blank 2: dioxide

The light reactions take place in the __________ membrane and the Calvin cycle takes place in the ____________ of a chloroplast.

Blank 1: thylakoid Blank 2: stroma

The light reactions take place in the ___________ membrane and the Calvin cycle takes place in the ____________ of a chloroplast.

Blank 1: thylakoid Blank 2: stroma

Which of the following are reactants for the Calvin cycle?

CO2 NADPH ATP

Beginning with the influx of CO2 from the air, list the three steps of the Calvin cycle in the correct order:

Co2 Fixation CO2 reduction Regeneration OF RuBP

Select the three steps of the Calvin cycle from the options listed here.

Regeneration of RuBP Carbon dioxide fixation Carbon dioxide reduction

True or false: Plants are the only organisms that are autotrophs.

False

True or false: The flow of water molecules fuels the synthesis of ATP.

False

3PG, BPG, and G3P are similar 3-carbon molecules. Which of these molecules, produced during the Calvin cycle, is reduced, is more chemically able to store energy, and can form larger organic molecules such as glucose?

G3P

The product of the Calvin cycle that is the first reactant in many metabolic reactions in a plant cell is ______.

G3P

The production of all plant carbohydrates begins with the formation of _______.

G3P

Select all of the major inputs of the light reactions of photosynthesis.

H2O NADP+ Solar energy ADP

If photosystem II were absent, which of the following would be true?

H2O molecules would not be split.

Where does photosynthesis take place in a flowering plant?

In organelles called chloroplasts

Which enzyme begins the Calvin cycle reactions by catalyzing attachment of the carbon atom from CO2 to a 5-C sugar, RuBP?

RuBP carboxylase

Which two of the following are true about the relationship between the light reactions and the Calvin cycle reactions?

Some of the products of the Calvin cycle reactions feed back into the light reactions so that carbohydrate production can continue. The outputs of the light reactions are the inputs for the Calvin cycle.

Which answer below is the coenzyme that transports electrons during photosynthesis?

NADP+

Which of the following are products of the Calvin cycle?

NADP+ ADP CH2O

Which of the following take place during the light reactions?

NADP+ is reduced Solar energy energized electrons ATP is produced

Select all of the products of the light reactions of photosynthesis.

NADPH ATP

Select all that apply. During the light reactions, electrons that are energized by sunlight move down an electron transport chain, releasing energy that is captured to produce

NADPH ATP

Which molecules are needed for the reduction of 3PG to G3P?

NADPH ATP

Which of the following are products of the light reactions that then serve as reactants for the Calvin cycle?

NADPH and ATP

The products of photosynthesis are

O2 and glucose.

Which of these is a molecular complex that uses light energy to reduce NADP+ to NADPH?

Photosystem I

Which of these is a molecular complex that uses light energy to oxidize water molecules, releasing oxygen?

Photosystem II

Identify the roles played by the molecular complexes of the thylakoid membrane by matching each with its description.

Photosystem II matches Choice, A molecular complex that uses light energy to oxidize water molecules and fuel ATP synthesis Photosystem I matches Choice, A molecular complex that uses light energy to reduce NADP+ to NADPH Electron transport chain matches Choice, Carries electrons from PSII to PSI via redox reactions ATP synthase complex matches Joins ADP + P to form ATP

Which molecular complex of the thylakoid membrane results in the production of oxygen during the light reactions?

Photosystem II (PSII)

True or false: When NADP+ is reduced, it accepts electrons.

True

A heterotrophic organism is best described as an organism that:

cannot synthesize organic compounds from inorganic substances and therefore must take in organic food

Select the reactants for the process of photosynthesis.

carbon dioxide water

Pigments that serve as an accessory to chlorophyll in photosynthesis and that can give cells a yellow to red color are called ___.

carotenoids

While chlorophyll is the major pigment used in photosynthesis, plants also use yellow and orange accessory pigments called

carotenoids

The term used to describe the method by which ATP is produced by the flow of H+ from high concentration to low concentration is

chemiosmosis

What is the term for the process by which the light reactions of photosynthesis generate energy in the form of ATP?

chemiosmosis

A green pigment that absorbs solar energy and is important in algal and plant photosynthesis is called

chlorophyll

The primary photosynthetic pigment that plants use to absorb solar energy is

chlorophyll

The organelle in plant cells that contains chlorophyll and is the site of photosynthesis is the

chloroplast

Photosystem I functions to

form NADPH.

Match the carbohydrate on the left to the correct function in plants on the right.

glucose matches Choice, substrate for ATP synthesis sucrose matches Choice, energy transport cellulose matches Choice, cell wall structure starch matches Choice, energy storage

Organisms that cannot synthesize organic compounds from inorganic substances and therefore must take in organic molecules (food) are

heterotrophs

Electrons moving from water to NADP+ are in the ___________ pathway.

noncyclic

Which of the following are examples of autotrophic organisms?

palm tree algae cyanobacteria

Which process converts solar energy into chemical energy in the form of a carbohydrate?

photosynthesis

A light-capturing unit found in a thylakoid membrane that consists of a pigment complex and electron acceptor molecules is called a(n)

photosystem

Which of the following are examples of heterotrophic organisms?

reindeer rabbit

Photosynthesis is the process that converts energy into the energy of a carbohydrate.

solar; chemical

The pigments of chloroplasts only absorb a specific range of wavelengths. This is the pigment's absorption

spectrum

During photosynthesis, carbon dioxide enters the leaf of a plant through small openings called _____.

stomata

Energy to move electrons down the electron transport chain during the light reactions of photosynthesis comes from _____.

sunlight

What is the energy source for the light reactions of photosynthesis, which serves to energize electrons?

sunlight

RuBP carboxylase is an enzyme found in chloroplasts and is also

the first enzyme in the Calvin cycle.

Plants use wavelengths of ______ to power the process of photosynthesis.

visible light

In the noncyclic pathway, electrons are moved from _____ to _______.

water; NADP+