Photosynthesis: The Light-dependent Reactions
- 1.What metabolic reaction releases energy?
- A.
Exothermic
- B.
Endothermic
- C.
Catalyst
- 2.What is the substance that increases the rate of areaction that would otherwise be too slow?
- A.
Coupled reaction
- B.
Catalyst
- C.
Enzyme
- 3.What is the region on the enzyme where the reaction takes place?
- A.
Catalyst
- B.
Reactive site
- C.
Active site
- 4.What is it called when enzymes link reactions that release energy to reactions that require energy?
- A.
Exothermic reaciton
- B.
Oxidation
- C.
Coupled reaction
- 5.Each step in photosynthesis and respiration is mediated by what?
- A.
Catalyse
- B.
Oxygenase
- C.
Enzymes
- 6.Check which are characteristics of oxidation
- A.
Gain of electrons
- B.
More C-H bonds
- C.
More C-O bonds
- D.
Loss of electrons
- 7.When an electron is removed, a proton may follow, with a result that a hydrogen ion is often (blank) during oxidation and (blank) during reduction.
- A.
Added; removed
- B.
Removed; added
- C.
Added; added
- 8.Carbon dioxide diffuses through the stomatal pores and goes into solution in the thin film of water on the outside walls of the mesophyll cells.
- A.
True
- B.
False
- 9.What is the source of electrons used in photosynthesis?
- A.
Carbon dioxide
- B.
Water
- C.
Glucose
- 10.What is the colorless fluid matrix which contains enzymes in the chloroplast?
- A.
Grana
- B.
Thylakoids
- C.
Stroma
- 11.The grana are the double-membrane disks in the chloroplast
- A.
True
- B.
False
- 12.The thylakoid membrane contains green chlorophyll and other light capturing pigments.
- A.
True
- B.
False
- 13.About 40% of the radiant energy plants receive from the sun is in the form of UV light
- A.
True
- B.
False
- 14.Shorter wavelengths have higher energy and longer wavelenghts have less energy
- A.
True
- B.
False
- 15.What color has the shortest wavelengh; which one has the longest?
- A.
Violet; red
- B.
Red; violet
- C.
Blue; green
- 16.In 1882, who demonstrated that oxygen production is diectly related to the type of light that the chlorophyll absorbs?
- A.
Gregory V. Medel
- B.
George Chikealo
- C.
T.W. Engelmann
- D.
Henry W. Goddard
- 17.What does each cholophyll molecule contain?
- A.
A long lipid tail which is anchored into the interior of a thylacoid membrane
- B.
A phosphate group
- C.
One atom of magnesium
- D.
A Hydroxyl group
- 18.Chlorophyll a reflects bluish green light
- A.
True
- B.
False
- 19.There is 3x more chlorophyll b than a in a chlorolplast.
- A.
True
- B.
False
- 20.What is the yellowish-orange pigment found in all plants?
- A.
Chlorophyll a
- B.
Chlorophlyll b
- C.
Carotenoids
- 21.The maximum absorption of Carotenouds is in the blue and red wavelength
- A.
True
- B.
False
- 22.Light dependent photosynthesis is a (blank) pathway
- A.
Cyclic
- B.
Non-cyclic
- 23.For both photosystems involved in the non-cyclic pathway, their individual units are made up of:
- A.
Mostly chlorophyll b
- B.
Mostly chlorophyll a
- C.
Much smaller amounts of chlorophyll b and carotenoid pigments
- D.
Much larger amounts of chlorophyll b and carotenoid pigments
- E.
A reaction-center molecule of chlorophyll a
- 24.The reaction-center molecule is the only molecule in the unit where an electron can be raised to an excited state.
- A.
True
- B.
False
- 25.The other pigments in the unit are called (blank) because they gather light energy and pass that energy on to the reaction-molecule.
- A.
Reacrtion-center
- B.
Antenna pigments
- C.
UV pigments
Questions: 14 | Attempts: 14406 | Last updated: Jan 4, 2021
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