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