Deck 6: Photosynthesis: Acquiring Energy From the Sun

Question 1

C₄ photosynthesis is an adaptation to hot,dry conditions in which

A) CO₂ is fixed and concentrated in the leaf.
B) water is stored in the stem.
C) oxygen is stored in the root.
D) light energy is stored in chloroplasts.

Answer 1

A

Question 2

Photosynthetic pigments are embedded into the membranes of flattened sacs within chloroplasts called

A) matrices.
B) Golgi bodies.
C) stroma.
D) cristae.
E) thylakoids.

Answer 2

E

Question 3

The full range of energy in sunlight can best be described as

A) the electromagnetic spectrum.
B) visible light.
C) ultraviolet light.
D) infrared radiation.

Answer 3

A

Question 4

When something appears blue,it is absorbing all colors except __________.

A) yellow
B) red
C) blue
D) green
E) orange

Question 5

Within the photosystem,the key chlorophyll molecule that donates a high-energy electron to the electron transport system is called the

A) proton pump.
B) ATP synthase.
C) rubisco.
D) reaction center.
E) retinal.

Question 6

When carbon dioxide is low in the leaf,the Calvin cycle cannot proceed efficiently,and the result is

A) light-independent reactions.
B) shutting down photosynthesis.
C) photorespiration.
D) cellular respiration.

Question 7

Which wavelength of light is the shortest?

A) Gamma rays
B) X-rays
C) UV light
D) Visible light
E) Infrared

Question 8

How much of the radiant energy from the sun is incorporated into organic compounds in the process of photosynthesis?

A) Almost 90%
B) 50%
C) 25%
D) 1% or less

Question 9

Light energy arrives at earth in tiny packets called

A) rays.
B) photons.
C) light waves.
D) wavelengths.

Question 10

Most of the atmospheric oxygen occurs as a result of photosynthesis.From which of the following molecules is the oxygen derived?

A) Carbon dioxide
B) Water
C) Glucose
D) Chlorophyll
E) NADH

Question 11

Which is incorrect about photosynthesis?

A) The light reactions take place in the cytoplasm and the dark reactions occur in the chloroplast.
B) The light-independent reactions don't require light but can occur in its presence.
C) The light-dependent reactions produce NADPH and ATP.
D) The light-dependent reactions release oxygen.
E) Photosystems act as antennae to capture photons.

Question 12

The overall purpose of the Calvin cycle is to

A) generate molecules of ATP.
B) generate NADP.
C) give off oxygen for animal use.
D) build organic molecules.

Question 13

Within chloroplasts,the fluid-like matrix in which the Calvin cycle occurs is called

A) thylakoids.
B) grana.
C) stroma.
D) mesophyll.

Question 14

Molecules that absorb light energy are called

A) pigments.
B) thylakoids.
C) enzymes.
D) electron transport systems.
E) grana.

Question 15

Which of the following does not participate in the Calvin cycle?

A) ATP
B) CO₂
C) NADPH
D) O₂
E) All participate in the Calvin cycle.

Question 16

Chlorophylls are important to many plants because these pigments are able to

A) remove carbon dioxide from the air.
B) absorb water so that hydrolysis can be carried out in the chloroplasts.
C) absorb red and blue wavelengths of light very efficiently.
D) capture UV radiation that is harmful to the DNA in the nucleus of plant cells.
E) store electrons for use during the "dark" reaction of photosynthesis.

Question 17

Plants absorb ______ and _________ wavelengths of light and reflect _______ wavelengths.

A) green,red,blue
B) green,blue,red
C) red,blue,green
D) white,green,blue
E) white,green,red

Question 18

How many turns of the Calvin cycle are needed to make one glucose molecule?

A) 1
B) 2
C) 3
D) 5
E) 6

Question 19

During photosynthesis,ATP molecules are directly generated by

A) the Calvin cycle.
B) chemiosmosis.
C) the splitting of water.
D) light striking the chlorophyll molecules.

Question 20

Which of the following is not located on a thylakoid membrane?

A) Rubisco
B) Chlorophyll
C) Photosystem
D) Electron transport system
E) ATP synthase

Question 21

The main products of photosynthesis are

A) glucose and oxygen.
B) glucose and carbon dioxide.
C) carbon dioxide and water.
D) water and oxygen.
E) ATP and oxygen.

Question 22

The energy to power the Calvin cycle comes from

A) cellular respiration.
B) the light-dependent reactions of photosynthesis.
C) the light-independent reactions of photosynthesis.
D) oxygen.
E) chlorophyll.

Question 23

The formation of ATP driven by the diffusion of protons down their concentration gradient through ATP synthase channels is called ________________.

Question 24

The portion of the electromagnetic spectrum visible to the human eye is known as ___________.

Question 25

Which of the following does not conduct photosynthesis?

A) Algae
B) Leaves of plants
C) Some bacteria
D) Roots of plants
E) None of the choices are correct.

Question 26

What is photorespiration and under what conditions does it occur?

Question 27

A photosystem transfers the excitation energy gathered by its pigment molecules to a specific chlorophyll at the reaction center.

Question 28

After hydrogens and electrons are stripped from NADPH,NADP⁺ is regenerated and can be used again in the

A) antenna complex.
B) the Calvin cycle.
C) the Krebs cycle.
D) the light-dependent reactions.
E) the light-independent reactions.

Question 29

Three turns of the Calvin cycle produces

A) glucose.
B) oxygen.
C) glyceraldehyde 3-phosphate.
D) rubisco.
E) 3-phosphoglyerate.

Question 30

____________ catalyzes the first step in the Calvin cycle and is also the most abundant enzyme on Earth.

Question 31

In the light-dependent reactions in plants,electrons flow from photosystem ___________ to photosystem ___________.

Question 32

Stoma open at night in plants that use _______ photosynthesis.

Question 33

A pigment appears red if it absorbs red light.

Question 34

Thylakoids are stacked on top of one another into columns called _______________.

Question 35

In chemiosmosis,a(n)_________ gradient drives the production of ATP using ATP synthase channels.

A) pigment
B) chlorophyll
C) proton
D) electron
E) NADPH

Question 36

The substrates for photosynthesis are light energy,

A) water,and oxygen.
B) oxygen,and carbon dioxide.
C) water,and carbon dioxide.
D) ATP,and oxygen.
E) glucose,and carbon dioxide.

Question 37

The Calvin cycle is also called C₃ photosynthesis because the first molecule produced in the process is a __________-carbon molecule.

Question 38

Inside the inner membranes of chloroplasts,chlorophyll pigments are grouped into a light-gathering complex called a ________________.

Question 39

What are the three stages of photosynthesis as described in section 06.01 in the discussion of the light-dependent and light-independent reactions? Which stages require light and which do not?

Question 40

_____________,which is generated by the light-dependent reactions,provides a source of hydrogens and the energetic electrons needed to bind them to carbon atoms in the Calvin cycle.

Question 41

Explain the role that water plays in the light-dependent reactions.