Biology 121 Test 2 Chapter 7
What name is given to a discrete packet of light?
photon
Which of the following is an autotroph?
pine tree
How many times must the Calvin cycle turn for the plant cell to be able to produce one molecule of glucose?
6
Which of the following equations best summarizes photosynthesis?
6 CO2 + 6 H2O → C6H12O6 + 6 O2
The Calvin cycle requires ______ and ______ from the light reactions in order to operate.
ATP... NADPH
The products of the light reactions of photosynthesis are ______.
ATP and NADPH
One of the compounds that is a direct output of the Calvin cycle is ______.
G3P
In photosynthesis, redox reactions ultimately transfer electrons from ______ to ______.
H2O... CO2
If an herbicide blocked the Calvin cycle before the generation of glyceraldehyde 3-phosphate (G3P), which of the following statements would be true?
No sugar would be made by the plant.
Which of the following is produced during the light reactions of photosynthesis?
O2
Which of the following is a way that a molecule releases energy gained by absorption of a photon?
all of the above
What is responsible for the yellow-orange coloration of leaves in the fall?
carotenoids
What compound is found at the reaction center of a photosystem?
chlorophyll a
What is the function of stomata?
gas exchange
The shorter the wavelength of visible light, the ______.
greater the energy
The energy of wavelengths that appear ______ is least useful to photosynthesis.
green
Which of the following is the source of electrons for the light reactions?
h2o
______ is the source of the oxygen gas released by a photosystem.
h2o
The light reactions of photosynthesis take place ______.
in the thylakoid membrane
C4 plants conserve water by ______.
keeping their stomata closed when the weather is hot and dry
CAM plants conserve water by ______.
opening their stomata only at night
If you provided your shade-tolerant plants with their preferred wavelength of light, but only minimal amounts of water, which of the following would you expect to occur?
decreased amounts of ATP being produced by the plants
Photosynthesis contributes to plant growth by _____.
taking in carbon dioxide and making sugars (carbohydrates)
In photosynthesis, an H+ ion gradient forms across the ______.
thylakoid membrane
Where are photosystems located?
thylakoid membrane
What name is given to the membranous sacs found within a chloroplast?
thylakoids
Within the inner membrane of a chloroplast, interconnected sacs of membrane called ______ are suspended in a thick fluid called the ______.
thylakoids... stroma
What is one reason why plants have accessory pigment molecules, like chlorophyll b and carotenoids?
to absorb energy in parts of the electromagnetic spectrum that chlorophyll a cannot
The color that we see when looking at a pigmented object is ______.
the wavelengths that are reflected or transmitted by the pigmented object
The Calvin cycle makes direct use of ______ to make ______.
CO2, ATP, and NADPH... sugar
The first step of the Calvin cycle is the incorporation of ______ into ______.
CO2... RuBP
If a plant appears blue to us, what wavelength of light is being reflected?
blue
Which of the following is found in both cellular respiration and in the light reactions of photosynthesis?
electron transport chain
When a molecule absorbs a photon, one of its electrons is raised to the ______ state.
excited
The last stage of one complete turn of the Calvin cycle involves ______.
regeneration of RuBP
What are grana?
stacks of membranous sacs