Biology Chapter 7 Quiz

Photorespiration occurs mainly in

C3 plants

Which of the following are characteristics of C4 plants? Select all that apply.

C4 plants store carbon dioxide temporarily as oxaloacetate. C4 plants are found in hot, dry climates. C4 plants have a net photosynthetic rate two or three times greater than C3 plants. C4 plants separate carbon fixation from the Calvin cycle.

Which statement is NOT true about the noncyclic electron pathway?

It produces carbohydrates through carbon dioxide fixation.

What is a characteristic of C4 leaves?

Mesophyll cells are arranged concentrically around bundle sheath cells.

Protons (H+) accumulate in the thylakoid space during electron transport between photosystems Il and I. Which of the following describes what will happen to these protons next?

The protons will move from the thylakoid space to the stroma through an ATP synthase complex that generates ATP.

Characterize these reactions involved in the Calvin cycle.

These reactions are involved in the reduction of CO2. Energy is required in the form of ATP, which is hydrolyzed to ADP. The substrate BPG is reduced, while the coenzyme NADPH is oxidized.

Why are plants green?

They reflect green wavelengths of light and absorb other colors of the visible light spectrum.

To what does the term grana refer?

a stack of thylakoid membranes

The action spectrum of photosynthesis shows a high light absorption for violet/blue and orange/red and a low absorption for green/yellow. If we were to set up an experiment where narrow bands of unicolored light were shown on an aquatic plant such as Elodea, and we counted the number of bubbles of oxygen produced as an indicator of photosynthetic rate, how would the graph appear?

just like the action spectrum with peaks at violet/blue and orange/red and a trough at yellow/green

What are the end products of photosynthesis?

oxygen and carbohydrate

Oxygen production in photosynthesis involves which of the following? Select all that apply.

photosystem lI splitting of water light reactions

Which of the following plants is an example of a CAM plant?

pineapple

Which of the following organisms are capable of photosynthesis?

plants, algae, and some bacteria

To what does the term stroma refer?

the fluid-filled space of the chloroplast

What is the ultimate destination for the energized electrons during the light reactions of photosynthesis?

they are taken up by NADP+ to produce NADPH

While C4 plants have carbon dioxide fixation and carbon dioxide uptake separated by location within the plant, CAM plants

have these processes separated by time.

A product of photosynthesis, ............... is the chief source of energy for most organisms.

glucose

............ is a product of the Calvin Cycle that is used to form glucose phosphate, amino acids, or fatty acids.

glyceraldehyde 3-phosphate (G3P)

What would happen if the stomata of a leaf remained closed all day? Select all that apply.

Carbon dioxide in the air spaces of the leaf would decrease. Oxygen in the air spaces would increase. Photorespiration would increase in C3 plants.

What would happen if a drug directly interfered with the functioning of RuBP carboxylase?

Carbon dioxide would not be fixed to RuBP, stalling the Calvin cycle.

During the light reactions, what structure is responsible for absorbing the solar energy?

Chloroplast

What structure is required for an eukaryotic organism to be classified as an autotroph?

Chloroplast

If plants were no longer able to perform the light reactions and they could only utilize the Calvin cycle, which of the following would be true? Select all that apply.

Plants would not produce oxygen G3P would be produced in much smaller quantities.

The fixation of carbon dioxide in the first step of the Calvin cycle is facilitated by which enzyme?

RuBP carboxylase

Which of the following statements about the Calvin cycle is correct?

The CO2 is absorbed and reduced to CH2O.

Which is most closely associated with the Calvin cycle?

carbon dioxide fixation

Which of the following is a common photosynthetic pigment found in plants? Select all that apply.

chlorophyll a chlorophyll b carotenoids

The function of sunlight in photosynthesis is to

excite electrons in chlorophyll

When an electron has been excited to a higher energy state, it can then drop back to the original level, re-emitting the light as fluorescence. When chlorophyll is extracted in solution, and a bright red or blue light is shown on it, the chlorophyll fluoresces brightly. However, when the chlorophyll is packaged inside chloroplasts and the red or blue light is turned on, there is no fluorescence. This most likely indicates that

excited electrons are transferred to electron acceptors in the chloroplast.

G3P (glyceraldehyde-3-phosphate) can be used by plants to form which of the following? Select all that apply.

fatty acids amino acids starch