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Worksheets2.2 Cell Membrane
Total questions: 30
Worksheet time: 15mins
The majority of the plasma membrane is composed of ______.
phospholipids
proteins
carbohydrates
cholesterol
What property does the phospholipid bilayer give to a plasma membrane?
provides the barrier between the inside and outside of the cell
communicates between cells
conducts electrical impulses in nerve cells
allows cells to bind to each other
Which type of biological macromolecule is the main component of the plasma membrane?
carbohydrate
lipid
protein
nucleic acid
Where can carbohydrates be found when part of a plasma membrane?
On the outside of the membrane
On the inside of the membrane
Embedded part of the way into the membrane
Embedded the whole way through the membrane
Where can PROTEINS be found when part of a plasma membrane?
On the outside of the membrane
On the inside of the membrane
Embedded part of the way into the membrane
Embedded the whole way through the membrane
All of these
What is the function of cholesterol in a plasma membrane?
To make the membrane flexible
To control the effect of temperature changes
To attract water molecules
To allow nutrients and other essential molecules into the cell
What is the outer boundary called on ALL cells that controls what goes in and out of that cell?
Cell Wall
Nuclear Membrane
Plasma Membrane
Permeable Membrane
Which one of these would be considered a hypertonic solution to human cells?
Distilled Water
Saline Solution
Ringer's Solution
Tap Water
Which of the following would be considered Hypotonic to Human cells?
Distilled water
Saline solution
Ringer's solution
Seawater
Interstitial fluid is _________
considered mostly isotonic to intracellular fluid
found in-between cells
composed of water and solutes like sugars, fats, proteins and ions
all of these
Which statement is correct about diffusion?
It's very rapid over long distances.
It's a passive process which molecules move from a region of higher to lower concentration.
It requires an energy expenditure by the cell.
It's an active process where molecules move from a region of lower to higher concentration.
Plasma membranes are relatively impermeable to water-soluble molecules because the membranes
are waxy
water molecules are nonpolar
their bilayer is comprised of phospholipids
they have salt crystals embedded within them
Which statement about diffusion is false?
Diffusion does not require ATP
Simple diffusion depends upon specific carrier proteins
In diffusion, molecules move from areas of greater concentration to areas of lesser concentration
Diffusion continues until the molecular concentrations are in equilibrium
If aquaporins are injected into the membranes of epithelial cells that line blood vessels,
the flow of Na+ through aquaporins will increase
the intracellular concentration of K+ will increase
the membranes will become more permeable to water
the electrical properties of the cells will be altered
In a hypothetical study, cells are placed in a solution of glucose. At first, glucose enters the cell at a rapid rate, but after a few minutes facilitated diffusion of glucose seems to stop. Which of the following is NOT likely reason glucose stopped entering the cell?
the concentration of glucose reached equilibrium inside and outside of the cell
the concentration gradient no longer favors directional movement of glucose
the cell can no longer perform diffusion because it ran out of ATP
the rate of glucose exiting the cell matched the rate of glucose entering the cell
Define plasma membrane
lipid that helps minimize effects of temperature
only on the outer surface of the plasma membrane and are attached to proteins or lipids; form distinctive cellular markers
flexible boundary of a cell that separates a cell from its surroundings
may extend partway into the plasma membrane, cross the membrane entirely, or be loosely attached to its inside or outside face
Which of the following is the main component of the plasma membrane?
glycolipid
phospholipid
glycoprotein
cholesterol
What does "hydrophobic" mean?
water loving, associates with water
water fearing, does not associate with water
usually polar or ionic
an example would be solutes like sugar or salt
What does "hydrophilic" mean?
water loving, associates with water
water fearing, does not associate with water
usually nonpolar
an example would be solutes like oil or fat
Which are example is hydrophobic in nature.
Oil
Sugar
Salt
Water
Plasma membrane…
is selectively permeable
consist of triglyceride and cholesterol
separate cytoplasm and extracellular fluid
have proteins embedded the phospholipid bilayer
All of these
Statements below are true about receptor mediated endocytosis EXCEPT
It is a specialized type of pinocytosis.
It is a type of passive transport
Substance can be acquired even in low quantities in extracellular fluid
It enables cells to acquire bulk quantities of specific substance.
Which statements are true about active transport?
molecules move from low concentration to high concentration.
molecules move with the concentration gradient
ATP is required
Uses channel proteins
Small non-polar molecules like O2 and CO2 enter a cell throughnon-
simple diffusion
osmosis
facilitated diffusion
phagocytosis
An egg is placed in distilled water. What type of solution is it in? What will happen to the egg?
hypotonic, the egg increases in size
hypertonic, the egg reduces in size
isotonic, the egg remains the same in size
Osmosis is the movement of _____ across a membrane.
food
energy
oxygen
water
Name small compartment enclosed by a membrane formed to transport of material during bulk transport.
vesicles
large vacuole
mitochondria
lysosome
White blood cells engulf bacteria through what process?
pinocytosis
osmosis
phagocytosis
exocytosis
A patient has had a serious accident and lost a lot of blood. Unfortunately, there is no available blood in his blood type. In an attempt to replenish body fluids, which of the following is the best choice for an IV drip?
None of these
Distilled water, since its hypotonic to the blood cells
Saline solution, since its hypertonic to the blood cells
Ringer's solution, since its isotonic to the blood cells
Transport across a membrane which must utilize a transport protein, but does NOT use ATP is referred to as _____________.
Passive Transport
Facilitated Diffusion
Osmosis
Active Transport
