Chapter 9 TEST: Photosynthesis: Capturing Light Energy Biology 1306
During which phase of photosynthesis is ATP and NADPH synthesized?
light-dependent phase
A chlorophyll molecule has a porphyrin ring containing a single atom of:
magnesium
What are the reactants of the light-dependent reactions of photosynthesis?
H2O, ADP, and NADP+
A group of thylakoid discs make up what part of a chloroplast?
granum
The graph in the accompanying figure represents the:
absorption spectra for chlorophylls a and b
The synthesis of ATP during photosynthesis or respiration occurs as a result of what process?
phosphorylation of ADP
Which process not only yields electrons during photosystem I and II, but also is the source of almost all the oxygen in Earth's atmosphere?
photolysis
The energy of a(n) ____ is inversely proportional to its wavelength.
photon
Which photosynthetic unit consists of a pair of chlorophyll a molecules with an absorption peak of 700nm?
photosystem I
By definition, substances that absorb visible light are called:
pigments.
Which part of the chlorophyll molecule is responsible for absorbing light?
porphyrin ring
Each antenna complex absorbs light energy and transfers it to its reaction center, which consists of chlorophyll molecules and ____.
proteins
According to the graph in the accompanying figure, chlorophyll absorbs light most strongly in what region of the electromagnetic spectrum?
red and blue wavelengths
How many carbon fixation reactions make up the Calvin cycle?
13
Which best summarizes the overall reactions of photosynthesis?
6 CO2 + 12 H2O → C6H12O6 + 6 O2 + 6 H2O
Thylakoid membranes are involved in ____ synthesis.
ATP
What is the first step in the Calvin cycle?
CO2 attaches to RuBP.
Engelmann concluded that chlorophyll in the chloroplasts is responsible for photosynthesis based on the which of the following results?
The action spectrum of photosynthesis matched the maximum production of oxygen by Spirogyra, with the greatest accumulation of bacteria in the blue and red regions of the spectrum.
Why does red and blue light support the highest rates of photosynthesis?
These wavelengths are absorbed by chlorophyll more than any other wavelength.
ATP synthesis during the light-dependent reactions occurs by which process?
chemiosmosis
Which type of electromagnetic waves have the shortest wavelength?
gamma waves
What color does chlorophyll reflect?
green
ATP is formed when ____ the thylakoid lumen.
hydrogen ions leave
In C3 plants, the ____ are typically closed at night and open during the daytime to allow for gas exchange.
stomata
In which part of the chloroplast do the carbon fixation reactions take place?
stroma
What is the fluid-filled sac within the inner membrane of a chloroplast called?
stroma
Where is the electron transport chain of photosynthesis located?
thylakoid membrane
How many electrons are needed to reduce one molecule of NADP+ to NADPH?
two
What is the ultimate source of electrons for noncyclic electron transport, and thus photosynthesis?
water
