Where does the Calvin cycle occur?
a. thylakoid membrane
b. thylakoid lumen
c. stromal lamellae
d. cytosol
e. stroma
ANSWER: e
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What is the organism with the longest evolutionary history in this diagram?
a. human b. pig c. snake d. yeast
According to pressure-flow theory, how does sap move from the sieve tube into a sink?
A. a positive pump pressure B. osmosis of the dissolved sugars across the sieve tube and the sink plasma membranes C. a negative pump pressure D. gravitational action as phloem moves down from the source E. active membrane transport through the plasma membranes
Referring to Figure 43-4, which of the following would not be involved in producing a receptor
potential?
a. depolarization
b. the opening of a voltage-gated channel
c. the activation of a G protein
d. Na+
e. ADP
How are the X and Y chromosomes different?
a. only females have a Y b. only one is an autosome c. the X is smaller than the Y d. the Y carries fewer genes than the X