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Bio Quiz 3

Terms in this set (16)

Which one of these figures best represents a cell membrane? Explain why you chose that figure.
C, Both layers in C have tails, and it depicts a lipid bilayer. This forms because the hydrophobic tails interact with each other while the hydrophilic ends interact with water, which is on the outside and inside of the vesicle.
Which of the following is false about an electron transport system?
a. It is a series of redox reactions.
b. It does not occur in membranes.
c. Energy is released when electrons are passed.
d. Electrons begin with high energy then lose it as they are passed.
e. There is an initial electron donor and a final electron acceptor.
b. It does not occur in membranes.
In general, what type of transport does this figure represent? Explain how Na+ helps glucose to be transported.
Active transport:
Na+ flows down its concentration gradient, releasing energy, which allows glucose to move against its concentration gradient (from low to high concentration).
Define pseudoreproduction. How is the RNA World hypothesis connected to pseudoreproduction?
Pseudoreproduction is the separation of protocells. Protocells were believed to have carried RNA as the genetic material.
Define an experimental hypothesis.
A tentative answer to an experimental question.
What would 125 ul be in milliliters (mL)?
0.125 ml
Where does photosynthesis occur in cyanobacteria?
a. In the thylakoid membrane
b. In the cell membrane
a. In the thylakoid membrane
In general terms, describe the function of chlorophyll molecules in photosynthesis.
They absorb light or they donate electrons.
ATP hydrolysis is an example of an _______________ reaction.
a. exergonic
b. endergonic
a. exergonic
A(n) _______________ reaction is when a molecule accepts an electron.
a. reduction
b. oxidation
a. reduction
In one sentence, explain how oxygen is produced in photosynthesis.
The special chlorophyll molecule will strip electrons from water, making oxygen a product.
The process of photosynthesis probably originated
in plants.
in fungi.
in protists.
in animals.
in prokaryotes.
in prokaryotes.
An _________________ reaction is when energy is released.
exergonic
List two differences between facilitated transport and active transport.
Facilitated--molecules move from high to low concentration, energy is released
Active--molecules move from low to high concentration, energy is consumed
Bacterial cells were suspended in a medium containing a salt concentration higher than their internal cellular concentration. Would water flow out of the cell or into the cell? Is this a hypertonic or hypotonic situation?
Water would flow out of the cell. This is a hypertonic situation.
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