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Return to Biochemistry: The Molecular Basis of Life 7e Student Resources
Chapter 13 Review Quiz
Photosynthesis
Quiz Content
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Chlorophyll bears some structural resemblance to the molecule:
Starch
correct
incorrect
Triacylglycerols
correct
incorrect
Protein
correct
incorrect
Hemoglobin
correct
incorrect
Thyroxine
correct
incorrect
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An excited electron eventually returns to its ground state. If it returns by radiationless decay without emission of a photon, the energy is often found as:
Electrons
correct
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Ultraviolet light which causes the atom to glow
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Heat waves
correct
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Heat which causes the molecule to vibrate faster
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Energy which causes an electron to jump to another atom or molecule
correct
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Both chlorophyll and the carotenoids are found within plant cells in organelles called:
Stroma
correct
incorrect
Mitochondria
correct
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Lysosomes
correct
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Endoplasmic reticula
correct
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Chloroplasts
correct
incorrect
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In addition to chlorophyll and carotenoids, plant cells contain phycocyanins and phycoerythrins which assist in light absorption. If light made up of continuous wavelengths from400 to 700 nm is passed through solutions of the pigments, the pigments exhibit different absorption spectra. Chlorophyl b, for example, absorbs strongly near 450 nm and 650 nm, while the phycocyanins and phycoerythrins absorb more strongly in the region from 475 to 525 nm. What value might these different absorptions have to the plant cell?
A wide range of pigments is more attractive to gardeners who select the most beautiful plants
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A wide range of pigments allows the plant cell to harvest more of the available light
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The different absorption peaks are very useful to analytical chemists and evolved for that reason
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There is no actual advantage to the distribution of pigments
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The distribution of pigments allows plants to avoid predators
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The term "rubisco" is frequently used in connection with photosynthesis. Rubisco is:
A guide for assigning scores
correct
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A breakfast cereal
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A cereal killer
correct
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A set of criteria
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An important enzyme in the Calvin cycle
correct
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When one considers the vast array of metabolic choices an organism can make, control of metabolism is essential. If all the enzymes needed for any type of metabolism were present, what would determine whether photosynthesis would occur?
The availability of light
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The availability of heat
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The availability of water
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The availability of salt
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The availability of acid
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The primitive organisms which possessed photosystems are believed to have had survival value superior to organisms which lacked photosynthetic mechanisms. The primitive organisms are likely to have been similar in metabolism to the present-day:
Mitochondria
correct
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Green sulfur bacteria
correct
incorrect
Chloroplasts
correct
incorrect
. C
3
plants
correct
incorrect
C
4
plants
correct
incorrect
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There is no direct need for humans to consume chlorophyll, but β-carotene is essential as a source of vitamin A. In rare cases, persons trying to improve their night vision consume too much vitamin A and may turn orange, as did the skin of residents of Biosphere II. Hypervitaminosis A may result in headaches, impairment of vision, and liver damage. Hunters know that they must not consume livers of carnivores killed north of the Arctic Circle. Why would consumption of polar bear liver be more dangerous than eating rabbit liver?
β-carotene is nonpolar and becomes concentrated in the liver of carnivores
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Polar bears are much larger and have sharper teeth than rabbits
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Polar bears are an endangered species
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Polar bears have larger livers and provide too many calories
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Polar bear liver is more likely to harbor trichinosis-producing parasites and must be cooked longer
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Chloroplasts have membranes which contain ATP synthase similar to:
Mitochondria
correct
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Peroxisomes
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Golgi apparatus
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Nuclei
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Osteoblasts
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The amount of energy carried by light is directly proportional to the frequency of the radiation. The temperature of heavenly bodies can be estimated by examining the light emitted. A distant star is considered hottest if it emits:
Ultraviolet light
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IR
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Visible light
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Red light
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Yellow light
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Global climate changes concern farmers. In particular, their attempts to grow corn in northern latitudes may suffer because:
C
3
plants such as soybeans thrive in very dry climates
correct
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C
4
plants such as corn are tropical plants and may do well in warm, dry climates
correct
incorrect
C
4
plants don't rely on sunlight
correct
incorrect
C
4
plants store carbon dioxide at night
correct
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C
3
plants can live with very little sunlight
correct
incorrect
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The chlorophylls and carotenoids capture light for photosynthesis The light energy is absorbed and transmitted to the reactive center of Photosystem I by chlorophylls and carotenoids in their capacity as:
Mitochondria
correct
incorrect
Starch
correct
incorrect
Antenna pigments
correct
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Photosystem II
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Grana
correct
incorrect
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In order to carry out photosynthesis in the pitch-black depths of the ocean, the green sulfur bacterium GS1 obtains energy from:
Consumption of dead fish
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Black body radiation of the hot water
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Cosmic rays
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Freezing lava
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Underwater glaciers
correct
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In Chapter 13, you study some of the reactions which produce NADPH. Both NADH and NADPH are valuable sources of energy for physiological reactions. How is NADPH used in biosynthesis of carbohydrates?
NADPH is a source of energy for formation of glyceraldehyde-3-phosphate
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NADPH is a source of energy for formation of protein
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NADPH is a source of energy for formation of starch from glucose
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NADPH is a source of energy for formation of maintenance of the TCA cycle
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NADPH is a source of energy for formation of vitamin C
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An example of a plant you may have seen which has crassulacean acid metabolism is:
Pineapple
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Citrus trees
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Olives
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Lawn grass
correct
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Prickly pear cactus
correct
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Because the reactions of the Calvin cycle can occur in darkness, this portion of photosynthesis is often referred to as the dark reactions. Although they can occur in darkness, in reality, they take place most often in periods of sunlight because:
The enzymes can not find each other in the dark
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Sunlight activates the enzymes of the Calvin cycle
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The reactions of the Calvin cycle require ATP and NADPH, necessitating sunlight for generation
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Dark reactions are too sinister for life forms on this planet
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In reality, no sunlight is needed for extended periods of Calvin cycle operation
correct
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Many molecules which readily absorb visible light are brightly colored. In order to absorb electromagnetic radiation, the organic molecule must possess a portion called a:
Chromoplast
correct
incorrect
Chromophore
correct
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Ionophore
correct
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Stomata
correct
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Nucleus
correct
incorrect
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Photosynthesis can best be represented by the reaction:
6 H
2
O + 6 CO
2
----> C
6
H
12
O
6
+ 6 O
2
correct
incorrect
C
6
H
12
O
6
+ 6 O
2
----> 6 H
2
O + 6 CO
2
correct
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2 CH
3
CH
2
CH
2
CH
2
CH
2
CH
3
+ 19 O
2
----> 14 H
2
O + 12 CO
2
correct
incorrect
14 H
2
O + 12 CO
2
----> 2 CH
3
CH
2
CH
2
CH
2
CH
2
CH
3
+ 19 O
2
correct
incorrect
2 Chlorophyll molecules + sugar ----> water + light
correct
incorrect
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Photosystem II is found in the appressed regions of lamellae of the thylakoid membrane. What does the term "appressed" mean?
Stacked
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Held down by oppressive forces
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Curvy
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Groovy
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Wavy
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incorrect
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During very active photosynthesis, much of the reduced carbon fixed by the Calvin cycle as glyceraldehyde-3-phosphate is converted to starch. During the dark periods which follow, much of the starch is converted to:
Fats
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Cellulose
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Sucrose
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Lactose
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Protein
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Some of the reactions of the Calvin cycle are similar to reactions of the:
Tricarboxylic acid cycle
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Glycolysis
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Fatty acid synthesis
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Fatty acid oxidation
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Pentose phosphate pathway
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Many natural and synthetic materials fluoresce. The light absorbed by a molecule has:
A longer wavelength than the light emitted
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A shorter wavelength than the light emitted
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The same wavelength as the light emitted
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A brighter color than the light emitted
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The same color as the light emitted
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