Deck 6: Photosynthesis: Acquiring Energy From the Sun

Question 1

The fluid portion of the chloroplast is called the:

A) matrix
B) stroma
C) cytoplasm
D) gel
E) thylakoid

Answer 1

B

Question 2

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

A) electromagnetic radiation
B) visible light
C) ultraviolet light
D) infrared radiation

Answer 2

A

Question 3

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

A) CO₂ is fixed and stored 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 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

What is the metal ion in chlorophyll?

A) Magnesium
B) Iron
C) Zinc
D) Copper
E) Sulfur

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 of the following is not present during the Calvin cycle?

A) ATP
B) CO₂
C) NADPH
D) O₂
E) All are present during the Calvin cycle.

Question 8

Light energy arrives at earth in little packets called:

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

Question 9

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 10

During photosynthesis,ATP molecules are generated by:

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

Question 11

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

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

Question 12

Carotenoids 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 violet and blue-green wavelengths of light that are not absorbed by chlorophyll
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 13

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 14

Plants use ______ and _________ wavelengths of light and reflect the _______ wavelength.

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

Question 15

Which wavelength of light is the shortest?

A) gamma rays
B) X-rays
C) UV light
D) visible light
E) infrared

Question 16

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 17

After the phosphate bonds are broken in ATP in the Calvin cycle,what happens to the ADP?

A) It evaporates from the cell.
B) It is used in cellular respiration.
C) It breaks down further into AMP plus phosphate.
D) It is recycled back to the light-dependent reactions.
E) It is re-used again in the Calvin cycle,losing another phosphate.

Question 18

Which is incorrect about photosynthesis?

A) The light reactions take place in the cytoplasm and the light-independent 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 antenna to capture photons.

Question 19

The most abundant protein on earth is:

A) cellulose
B) rubisco
C) ATPase
D) NADPH
E) chlorophyll

Question 20

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 (carbon)molecules

Question 21

Thylakoids are stacked on top of one another into little piles called ______________.

Question 22

The substrates for photosynthesis are:

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

Question 23

What are the three stages of photosynthesis? Which stages require light and which do not?

Question 24

____________,which is provided by the photosystem,provides a source of hydrogen and the energetic electrons needed to bind them to carbon atoms.

Question 25

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 26

After hydrogens and electrons are stripped from NADPH,NADP+:

A) is sent to the electron transport chain of cellular respiration
B) is broken down further to NAD plus phosphate in the Calvin cycle
C) is sent to the Krebs cycle
D) is recycled back to the light-dependent reactions
E) evaporates from the cell

Question 27

Molecules capable of absorbing lots of light are _______________.

Question 28

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 29

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

Question 30

The internal membranes within the chloroplast are organized into flattened sacs called ____________.

Question 31

Stoma open at night in plants that use _______ photosynthesis.

Question 32

A pigment appears red if it absorbs red light.

Question 33

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

Question 34

One turn of the Calvin cycle produces one molecule of:

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

Question 35

The production of ATP in photosynthesis is called:

A) catabolism
B) oxidative phosphorylation
C) photophosphorylation
D) the Calvin cycle
E) photorespiration

Question 36

The molecule that supplies energy in the body is ___________.

Question 37

Which of the following does not do photosynthesis?

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

Question 38

What is the purpose of accessory pigments,such as carotenoids,in photosynthesis?

Question 39

For every 3 molecules of CO₂ that enter the Calvin cycle,one molecule of __________________ is produced.

Question 40

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

Question 41

How are photosynthesis and cellular respiration intimately related?

Question 42

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