Below is a diagram of a phospholipid. This macromolecule composes all of the membranes in a cell. To understand the general structure of a phospholipid bilayer you must first be able to identify the location of the phosphate in this molecule as well as the fatty acid or lipid area.
Question 5
5.
Question 6
6.
Question 7
7.
Question 8
8.
Knowing that all membranes are bilayers, made of phospholipids, and the fact that there is water in and around every cell in your body (or a dog or plant) anwer the next question!
Question 9
9.
Question 10
10.
On the diagram like the one shown above and over the model you believe to be correct, label the parts of the cell membrane that would be "hydrophilic" and "hydrophobic" by inserting a text box or ddrawing the words.
Question 11
11.
Question 12
12.
Question 13
13.
Question 14
14.
Question 15
15.
Exactly what do you expect to see knowing that cell membranes are bilayers?
1 layer big
2 layers big
3 layers big
4 layers big
Quick vocab refresher, what does hydro mean when you see it in a word?
to love
to fear or hate
water
Quick vocab refresher, what does phobic mean when you see it in a word?
water
to love
to fear or hate
Quick vocab refresher, what does philic or phile mean when you see it in a word?
water
to love
to fear or hate
Which letter shows, or which letters show, the location of the phosphate group?
A
B
C
Look carefully at the make up of the phosphate group. Based on what you see, and using what you know about water, what is true of phosphate groups?
they are non-polar and hydrophobic
they are non-polar and hydrophilic
they are polar and hydrophobic
they are polar and hydrophilic
Which letter shows, or which letters show, the location of the fatty acid or lipid area of the phospholipid?
A
B
C
Look carefully at the make up of the fatty acid or lipid area. Based on what you see, and using what you know from chapter 2, what is true of all lipids?
they are polar and hydrophilic
they are non-polar and hydrophilic
they are polar and hydrophobic
they are non-polar and hydrophobic
Which model of the phospholipid bilayer (shown in the image above) makes the most sense chemically speaking? Use what you know from the first 8 questions to make the right choice and that fact that molecules are clique like in the movie Mean Girls where the plastics only associate with the plastics
A
B
C
Based on the answer to #10 and using what you know, what types of substances can easily pass through the fatty inside of a phospholipid bilayer?
polar items
non-polar items
Know the idea that some substances can move through a cell’s membrane while others can’t is what makes cell membranes semipermeable. Google "semi meaning" and "permeable" to determine exactly what this term means then select the best definition below.
allows no substances to pass through
allows all substances ot pas through
allows some substances to pass through but not all
Phospholipids are not the only macromolecule in a cell membrane. State why cell membranes also have proteins.
proteins are important in making sure the phospholipids don't move too far apart or get too close together
proteins are important in transporting some substances through the membrane
proteins are important for cell recognition so your immune system cells can identify foreign cells like bacteria
Phospholipids are not the only macromolecule in a cell membrane. State why cell membranes also have cholesterol (a type of fat molecule) embedded in cell membranes.
cholesterols are important for cell recognition so your immune system cells can identify foreign cells like bacteria
cholesterols are important in making sure the phospholipids don't move too far apart or get too close together
cholesterols are important in transporting some substances through the membrane
Phospholipids are not the only macromolecule in a cell membrane. State why cell membranes also have carbohydrates (or sugars) attached to the surface of cell membranes.
sugar groups are important in making sure the phospholipids don't move too far apart or get too close together
sugar groups are important for cell recognition so your immune system cells can identify foreign cells like bacteria
sugar groups are important in transporting some substances through the membrane
