Cells
Membranes
Potpourri
100 100 100
200 200 200
300 300 300
DOUBLE JEOPARDY!
Cells for 100
Why are cells limited to such small sizes?
As cells grow larger, the volume grows
faster than the surface area. Therefore, the
nutrient needs of the organelles that make
up the volume of the cell outpace the ability
of a cell to take in nutrients across the
surface of the cell membrane.
Cells for 200
Name the function of each of the following cellular components.
Microtubule
Determine cell shape
Serve as tracks for intracellular movement
Extracellular movement as part of cilia and flagella
Microfilament
Increase surface area as part of microvilli
Enable muscle contraction
Nucleolus
Produce ribosomes
Cells for 300
What are three pieces of evidence supporting the endosymbiotic
theory?
1.
2.
3.
4.
5.
M&C have their own DNA in single, circular chromosomes
M&C have their own ribosomes which are similar to prokaryotic
ribosomes
M&C have a double lipid bilayer that resulted from endocytosis
M&C reproduce on their own via binary fission
M&C are similar in size to prokaryotic cells
Membranes for 100
What are TWO ways that membrane structure can
be altered to prevent solidification in cold temps?
More unsaturated fatty acids in phospholipids will
prevent clumping and loss of flexibility of the
membrane
Cholesterol in animal membranes will prevent
phospholipid clumping as well.
Membranes for 200
What type of organism might have a
contractile vacuole, and where might it live?
Single-celled protist
A hypotonic environment (lake, pond, river,
stream)
Membranes for 300
What is the difference between carrier proteins and channel
proteins?
Carrier – the protein binds to a particle, changes shape,
and moves it across the membrane
Channel – the protein opens a pathway for movement
through the membrane
Potpourri for 100
List three effects of a Na-K pump on a cell.
Builds up concentration of Na+ outside a cell.
Builds up concentration of K+ inside a cell.
Builds up an electrochemical gradient.
Potpourri for 200
Give two differences between gap junctions and
plasmodesmata.
Gap junctions
Animal cells
A few small pathways
Plasmodesmata
Plant cells
Many large pathways
Potpourri for 300
For each protein below, would it have been produced by a
free or bound ribosome?
A)
Insulin
Bound
B)
Tubulin (unit of mitotic spindle)
Free
C)
Digestive enzyme in lysosome
Bound
Cells
Membranes
Potpourri
200 200 200
400 400 400
600 600 600
FINAL JEOPARDY!
Cells for 200
What material makes up the internal
structure of a flagellum?
microtubules
Cells for 400
What is the purpose of the mitotic
spindle?
These microtubules serve as guides for
movement of chromosomes during cell
division
Cells for 600
If a ribosome moves to the ER as it works, what might be
its ultimate product?
A membrane protein
A secreted protein
A lysosome
Membranes for 200
A paramecium has a contractile vacuole.
What must be true of its environment if the
vacuole empties very infrequently?
Only a slightly hyptonic environment
Membranes for 400
A cell just experienced an increase in temperature in
relation to its isotonic surroundings. How will this
affect the osmotic flow of water?
It decreases the solute potential, so it increases the
likelihood that water will flow into the cell.
Membranes for 600
What are two functions of membrane proteins
other than transport?
Potpourri for 200
Why do liver cells have large amounts
of smooth endoplasmic reticulum?
It’s helpful in one of the main functions
of the liver – detoxification.
Potpourri for 400
What impact will a phosphatase have
on signal transduction?
It will dephosphorylate a molecule.
This stops signal transduction.