Which of the following processes could still occur in a chloroplast in the presence of an inhibitor that prevents H+ from passing through ATP synthasecomplexes?

generation of proton-motive force

What is the relationship between wavelngth of light and the quanitity of energy per photon?

only related in certain parts of the spectrum

What does light do when it strikes the chlorophyll molecules of photosystems I and II?

Light causes electrons to get excited (gain energy) and travel down the electron transport chain embedded in the thylakoid membrane.

Light causes glucose to be synthesized directly inside the chlorophyll molecules of the photosystems.

Light causes the conversion of water into carbon dioxide, oxygen, and electrons.

Light directly causes carbon dioxide to attach to RuBP during the carbon fixation stage of the Calvin Cycle.

As the electrons travel from photosystem II down the first electron transport chain, their energy is used to….

pump hydrogen ions into the thylakoid space, producing a concentration gradient that will later be used by ATP synthase to form ATP.

form oxygen, water, NADPH, and glucose.

pump hydrogen ions into the stroma, producing a concentration gradient that will later be used by an enzyme to form ADP and phosphate.

Why do hydrogen ions flow from the thylakoid space to the stroma through ATP synthase?

They flow passively from the high to low concentration via facilitated diffusion. As they flow through ATP synthase, the enzyme spins and produces ATP.

They are pumped actively through the ATP synthase. This uses ATP energy and causes the production of ADP and phosphate.

They flow through the Calvin cycle and produce light.

Hydrogen ions do not actually flow from the thylakoid space to the stroma. They flow the opposite way.

What happens to the remaining G3P molecules in the last step of the dark reactions?

They are reshuffled to make RuBP by adding ATP.

They are reshuffled to make CO 2 by adding ATP.

If ADP is phosphorylated then what is this indicating in the reaction?

ADP is being used to power other reactions

ADP is being created by the reaction

The molecule that functions as the reducing agent (electron donor) in a redox or oxidation-reduction reaction _____.

loses electrons and loses potential energy

gains electrons and gains potential energy

gains electrons and loses potential energy

loses electrons and gains potential energy

In chemiosmosis, what is the most direct source of energy that is used to convert ADP + i to ATP?

energy released from movement of protons through ATP synthase, down their electrochemical gradient

energy released as electrons flow through the electron transport system

energy released from substrate-level phosphorylation

No external source of energy is required because the reaction is exergonic.

What is the main purpose of photosynthesis?

to create a food source for the plant

to create CO2 for the atmosphere

Which of the following statements is a correct distinction between autotrophs and heterotrophs?

Autotrophs, but not heterotrophs, can nourish themselves beginning with CO2 and other nutrients that are inorganic

Cellular respiration is unique to heterotrophs

Only heterotrophs have mitochondria

Only heterotrophs require oxygen

The figure shows the absorption spectrum for chlorophyll a and the action spectrum for photosynthesis. Why are they different?

Other pigments absorb light in addition to chlorophyll a .

Green and yellow wavelengths inhibit the absorption of red and blue wavelengths

Oxygen given off during photosynthesis interferes with the absorption of light

Aerobic bacteria take up oxygen, which changes the measurement of the rate of photosynthesis

Why are there several structurally different pigments in the reaction centers of photosystems?

This arrangement enables the plant to absorb light energy of a variety of wavelengths.

Excited electrons must pass through several pigments before they can be transferred to electron acceptors of the electron transport chain

They enable the plant to absorb more photons from light energy, all of which are at the same wavelength.

They enable the reaction center to excite electrons to a higher energy level.

As electrons are passed through the system of electron carriers associated with photosystem II, they lose energy. What happens to this energy?

It is used to establish and maintain a proton gradient

It excites electrons of the reaction center of photosystem I.

It is used to phosphorylate NAD+ to NADPH, the molecule that accepts electrons from photosystem I

Carotenoids are often found in foods that are considered to have antioxidant properties in human nutrition. What related function do they have in plants?

They protect against oxidative damage from excessive light energy.

They serve as accessory pigments to increase light absorption

They shield the sensitive chromosomes of the plant from harmful ultraviolet radiation

They reflect orange light and enhance red light absorption by chlorophyll.

In a plant, the reactions that produce molecular oxygen (O2) take place in _____.

the light reactions and the Calvin cycle

neither the light reactions nor the Calvin cycle

A gardener is concerned that her greenhouse is getting too hot from too much light and seeks to shade her plants with colored translucent plastic sheets, the color of which allows passage of only that wavelength. What color should she use to reduce overall light energy but still maximize plant growth?

any color will work equally well

In the process of carbon fixation, RuBP attaches a CO2 to produce a six-carbon molecule, which is then split to produce two molecules of 3-phosphoglycerate. After phosphorylation and reduction produces glyceraldehyde 3-phosphate (G3P), what more needs to happen to complete the Calvin cycle?

addition of a pair of electrons from NADPH

Which of the following does NOT occur during the Calvin cycle?

regeneration of the CO2 acceptor

Photosynthesis Onramps Bio

Authored by Charles Martinez

Biology

10th - 12th Grade

NGSS covered

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which of the following does not occur during photosystem II?

splitting of water

capturing of light energy

releasing oxygen

formation of carbohydrates

When are ATP and NADPH produced?

light-dependent reactions

Calvin Cycle

Krebs Cycle

light- independent reactions

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

During photosystem II, the hydrogen ions are pumped

out of the thylakoid lumen

into the thylakoid lumen

out of the chloroplast

into the chloroplast

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

During photosynthesis sugars are assembled during

photosystem II

photosystem I

Calvin cycle

Krebs cycle

Where is ATP synthase used during photosynthesis located?

stroma

chloroplast membrane

thylakoid membrane

cell membrane

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Where does the Calvin cycle take place?

Stroma

thylakoid

thylakoid space

matrix

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

When oxygen is released as a result of photosynthesis, it is a direct by-product of____

reducing NADP+

splitting water molecules

chemiosmosis

electron transfer in photosystem 1

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Photosynthesis Onramps Bio

Which of the following does not occur during photosystem II?

When are ATP and NADPH produced?

During photosystem II, the hydrogen ions are pumped

During photosynthesis sugars are assembled during

Where is ATP synthase used during photosynthesis located?

Where does the Calvin cycle take place?

When oxygen is released as a result of photosynthesis, it is a direct by-product of____

A plant has reddish leaves. What wavelengths of visible light are being absorbed by this pigment

Which of the following processes could still occur in a chloroplast in the presence of an inhibitor that prevents H+ from passing through ATP synthasecomplexes?

T or F: Autotrophs, but not heterotrophs, can nourish themselves beginning with carbon dioxide and other nutrients that are entirely organic

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