1)Which of the following is a disadvantage of being a multicellular organism? Gr
ID: 204923 • Letter: 1
Question
1)Which of the following is a disadvantage of being a multicellular organism?
Greater energy needs
More difficult to absorb nutrients
Reproduction more difficult
All of the above
2)If you had a patient in which the lung epithelium was leaking fluids from the bloodstream into the lumen of the lung, which of the following is the most likely cause?
A mutation in a proteoglycan
Very high levels of cholesterol in cellular membranes
A collagen disorder
A mutation in a cell adhesion molecule
3)Which of the following is NOT consistent with the fluid mosaic model of cell membranes?
Cell membranes are lipid bilayers
There are proteins that don’t diffuse laterally in the plane of the membrane.
Membrane-spanning proteins are always oriented in the same way in the membrane.
The same phospholipids are found in the inner and outer leaflets of cell membranes.
4)
For solutes that cannot diffuse through the membrane, water diffuses across the membrane from a region of ______ to a region of ______ solute concentration.
High to low (solute concentration)
Low to high (solute concentration)
5) Protons (H+) are moved up their concentration gradients into the lysosome in order to activate lysosomal enzymes. This is an example of:
Simple diffusion.
Facilitated diffusion.
Ion channels.
high extracellular glucose
Facilitated diffusion
The Na+/K+ ATPase
Ca++ channels
7) Which of the following is a DISADVANTAGE of endocrine signaling?
It is so complex that things can easily go wrong.
By the time it reaches the target cell, the ligand concentration is likely to be low.
It usually involves regulated secretion, which requires a signal.
It may involve second messengers, which require an enzyme-catalyzed reaction
Active transport
Greater energy needs
More difficult to absorb nutrients
Reproduction more difficult
All of the above
2)If you had a patient in which the lung epithelium was leaking fluids from the bloodstream into the lumen of the lung, which of the following is the most likely cause?
A mutation in a proteoglycan
Very high levels of cholesterol in cellular membranes
A collagen disorder
A mutation in a cell adhesion molecule
3)Which of the following is NOT consistent with the fluid mosaic model of cell membranes?
Cell membranes are lipid bilayers
There are proteins that don’t diffuse laterally in the plane of the membrane.
Membrane-spanning proteins are always oriented in the same way in the membrane.
The same phospholipids are found in the inner and outer leaflets of cell membranes.
4)
For solutes that cannot diffuse through the membrane, water diffuses across the membrane from a region of ______ to a region of ______ solute concentration.
High to low (solute concentration)
Low to high (solute concentration)
5) Protons (H+) are moved up their concentration gradients into the lysosome in order to activate lysosomal enzymes. This is an example of:
Simple diffusion.
Facilitated diffusion.
Ion channels.
6) Extracellular chloride ion (Cl-) concentrations are much higher than intracellular. This gradient is maintained in part by co-transport of K+and Cl- out of the cell using indirect active transport. Maintenance of the Cl- concentration gradient using this mechanism is therefore dependent on:high extracellular glucose
Facilitated diffusion
The Na+/K+ ATPase
Ca++ channels
7) Which of the following is a DISADVANTAGE of endocrine signaling?
It is so complex that things can easily go wrong.
By the time it reaches the target cell, the ligand concentration is likely to be low.
It usually involves regulated secretion, which requires a signal.
It may involve second messengers, which require an enzyme-catalyzed reaction
Active transport
Explanation / Answer
1- D - All of the above.
2- Last option - A mutation in cell adhesion molecule. This is what causing the leakiness of epithelium.
3-Last - Same phospholipds are present on both outer amd inner segments of the lipid membrane .
4- low to high solute concentration
5- Active transport , Anything moving against a concentration gradient is active transport.
6- Na / K ATPase. which sets up concentration gradient for K driving this co transport of K and Cl.
7 - By the time it reaches target , the concentration of ligand is very low
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