Importance of Chlorophyll and Other Pigments

Question 1

Chlorophylls are greenish pigments which contain a porphyrin ring. What purpose is set by this structure?

Answer 1

A stable molecule from which electrons are free to migrate.

Question 2

Which chlorophyll molecule makes photosynthesis possible, by passing its energized electrons on to molecules which will manufacture sugars?

A. chlorophyll a
B. chlorophyll b
C. chlorophyll c
D.chlorophyll d

Answer 2

C. chlorophyll c

Question 3

Which of the following statements dos NOT describe a carotenoid as a pigment?

A. They are also called accessory pigments.
B. It is water-soluble and must be attached to membranes within the cell.
C. It is composed of two small six-carbon rings connected by a “chain”
of carbon atoms.
D. Carotenoids cannot transfer sunlight energy directly to the photosynthetic pathway, but must pass their absorbed energy to
chlorophyll.

Answer 3

B. It is water-soluble and must be attached to membranes within the cell.

Question 4

Which water-soluble pigment gives a reddish color appearance which gives the red algae their common name?

A. carotene
B. phycocyanin
C. phycoerythrin
D. fucoxanthin

Answer 4

C. phycoerythrin

Question 5

Pigments have extensive use in cancer research, for identifying tumor cells. When the solution is sprayed as a stream of fine droplets past a laser and computer sensor, a machine can identify whether the cells in
the droplets have been identified by the antibodies. Which of the following sentences supports this claim?

A. The light produced by fluorescence may be used as chemical “tags”
B. The light produced by fluorescence may categorize illnesses
C. Pigments are utilized to absorb light energy
D. Pigments are used as antibodies.

Answer 5

A. The light produced by fluorescence may be used as chemical “tags”

Question 6

How do chlorophyll – a and accessory pigments differ?

Answer 6

Pigments are chemical compounds that absorb particular wavelengths of light, and so appear that color in our eyes.

Question 7

Electrons that are excited to a higher energy level may be transferred to an electron acceptor or may return to a ground state. If the latter occurs, energy will be released in a process known as:

Answer 7

photoelectron deconfiguration

Question 8

Chlorophyll and accessory photosynthetic pigments are associated with the:

Answer 8

thylakoid membranes

Question 9

Chlorophyll molecules are attached to thylakoid membranes by:

Answer 9

the methyl group

Question 10

Chlorophyll absorbs most light in which colors of the visible range?

A. Blue and red
B. Green and red
C. Violet and red
D. Violet and green

Answer 10

A. Blue and red