Biology I Exam #2
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1. cell theory the cell is the fundamental unit of life in all organisms & cells come only from
preexisting cells
2. key functions of makes up cell membrane, energy storage
lipids
3. 2 primary func- 1. define cell boundary
tions of the cell 2. regulation of molecules
membrane
4. main compo- - lipids
nents of the cell - proteins
membrane - carbohydrates
5. what contributes lipid types & characteristics of fatty acid chains
to the fluidity of a
membrane?
6. amphipathic having both hydrophilic & hydrophobic regions
7. which part of a head
phospholipid is
hydrophilic?
8. which part of a fatty acid tails
phospholipid is
hydrophobic?
9. main function of forms the cell membrane
a phospholipid
10. lipid bilayer 2 layers of lipids
, Biology I Exam #2
Study online at https://quizlet.com/_jn5f3d
11. which part of the nonpolar, hydrophobic tail
phospholipid is
tucked inside the
membrane?
12. why is the po- can form bonds
lar part of the
phospholipid fac-
ing outward?
13. liposome spherical bilayer structure
- forms in aqueous environment at neutral pH
14. why is pH impor- ensures polar head is in ionized form--makes them hydrophilic
tant?
15. van der Waals weak binding of temporarily polarized molecules due to attraction of opposite
forces charges
- helps w/ sticking of cholesterol/phospholipids in a cell membrane
16. saturated fats - NO carbon=carbon double bonds
- straight structure
- tight packing --> reduces mobility (fluidity)
, Biology I Exam #2
Study online at https://quizlet.com/_jn5f3d
17. unsaturated fats - carbon=carbon double bonds
- kinked structure
- reduced tightness of packing --> enhances mobility (fluidity)
18. cholesterol makes up 30% of cell membrane
19. which part of hydroxyl group on steroid ring A
cholesterol is hy-
drophilic?
20. what role does helps with tight-packing
cholesterol play
in a cell mem-
brane?
21. what is the orien- amphipathic
tation of choles- - hydrophobic, rigid planar group of rings & hydrophobic hydrocarbon tail
terol? (interacts w/ hydrophobic fatty acid tails of phospholipid)
- hydrophilic head group
(interact w/ hydrophilic head of phospholipid)
22.
Study online at https://quizlet.com/_jn5f3d
1. cell theory the cell is the fundamental unit of life in all organisms & cells come only from
preexisting cells
2. key functions of makes up cell membrane, energy storage
lipids
3. 2 primary func- 1. define cell boundary
tions of the cell 2. regulation of molecules
membrane
4. main compo- - lipids
nents of the cell - proteins
membrane - carbohydrates
5. what contributes lipid types & characteristics of fatty acid chains
to the fluidity of a
membrane?
6. amphipathic having both hydrophilic & hydrophobic regions
7. which part of a head
phospholipid is
hydrophilic?
8. which part of a fatty acid tails
phospholipid is
hydrophobic?
9. main function of forms the cell membrane
a phospholipid
10. lipid bilayer 2 layers of lipids
, Biology I Exam #2
Study online at https://quizlet.com/_jn5f3d
11. which part of the nonpolar, hydrophobic tail
phospholipid is
tucked inside the
membrane?
12. why is the po- can form bonds
lar part of the
phospholipid fac-
ing outward?
13. liposome spherical bilayer structure
- forms in aqueous environment at neutral pH
14. why is pH impor- ensures polar head is in ionized form--makes them hydrophilic
tant?
15. van der Waals weak binding of temporarily polarized molecules due to attraction of opposite
forces charges
- helps w/ sticking of cholesterol/phospholipids in a cell membrane
16. saturated fats - NO carbon=carbon double bonds
- straight structure
- tight packing --> reduces mobility (fluidity)
, Biology I Exam #2
Study online at https://quizlet.com/_jn5f3d
17. unsaturated fats - carbon=carbon double bonds
- kinked structure
- reduced tightness of packing --> enhances mobility (fluidity)
18. cholesterol makes up 30% of cell membrane
19. which part of hydroxyl group on steroid ring A
cholesterol is hy-
drophilic?
20. what role does helps with tight-packing
cholesterol play
in a cell mem-
brane?
21. what is the orien- amphipathic
tation of choles- - hydrophobic, rigid planar group of rings & hydrophobic hydrocarbon tail
terol? (interacts w/ hydrophobic fatty acid tails of phospholipid)
- hydrophilic head group
(interact w/ hydrophilic head of phospholipid)
22.
