BIOLOGY I EXAM #2 UPDATED ACTUAL QUESTIONS
AND CORRECT ANSWERS
Question:
1. cell theory
Answer:
the cell is the fundamental unit of life in all organisms & cells come only from
preexisting cells
Question:
2. key functions of lipids
Answer:
makes up cell membrane, energy storage
Question:
3. 2 primary functions of the cell membrane
Answer:
1. define cell boundary
2. regulation of molecules
Question:
4. main components of the cell membrane
Answer:
- lipids
- proteins
- carbohydrates
Question:
5. what contributes to the fluidity of a membrane?
Answer:
lipid types & characteristics of fatty acid chains
Question:
6. amphipathic
Answer:
having both hydrophilic & hydrophobic regions
,Question:
7. which part of a phospholipid is hydrophilic?
Answer:
head
Question:
8. which part of a phospholipid is hydrophobic?
Answer:
fatty acid tails
Question:
9. main function of a phospholipid
Answer:
forms the cell membrane
Question:
10. lipid bilayer
Answer:
2 layers of lipids
Question:
11. which part of the phospholipid is tucked inside the
membrane?
Answer:
nonpolar, hydrophobic tail
, Question:
12. why is the polar part of the phospholipid facing outward?
Answer:
can form bonds
Question:
13. spherical bilayer structure
- forms in aqueous environment at neutral pH
Answer:
liposome
Question:
14. why is pH important?
Answer:
ensures polar head is in ionized form--makes them hydrophilic
Question:
15. van der Waals forces
Answer:
weak binding of temporarily polarized molecules due to attraction of opposite
charges
- helps w/ sticking of cholesterol/phospholipids in a cell membrane
Question:
16. - NO carbon=carbon double bonds
- straight structure
- tight packing --> reduces mobility (fluidity)
Answer:
saturated fats
AND CORRECT ANSWERS
Question:
1. cell theory
Answer:
the cell is the fundamental unit of life in all organisms & cells come only from
preexisting cells
Question:
2. key functions of lipids
Answer:
makes up cell membrane, energy storage
Question:
3. 2 primary functions of the cell membrane
Answer:
1. define cell boundary
2. regulation of molecules
Question:
4. main components of the cell membrane
Answer:
- lipids
- proteins
- carbohydrates
Question:
5. what contributes to the fluidity of a membrane?
Answer:
lipid types & characteristics of fatty acid chains
Question:
6. amphipathic
Answer:
having both hydrophilic & hydrophobic regions
,Question:
7. which part of a phospholipid is hydrophilic?
Answer:
head
Question:
8. which part of a phospholipid is hydrophobic?
Answer:
fatty acid tails
Question:
9. main function of a phospholipid
Answer:
forms the cell membrane
Question:
10. lipid bilayer
Answer:
2 layers of lipids
Question:
11. which part of the phospholipid is tucked inside the
membrane?
Answer:
nonpolar, hydrophobic tail
, Question:
12. why is the polar part of the phospholipid facing outward?
Answer:
can form bonds
Question:
13. spherical bilayer structure
- forms in aqueous environment at neutral pH
Answer:
liposome
Question:
14. why is pH important?
Answer:
ensures polar head is in ionized form--makes them hydrophilic
Question:
15. van der Waals forces
Answer:
weak binding of temporarily polarized molecules due to attraction of opposite
charges
- helps w/ sticking of cholesterol/phospholipids in a cell membrane
Question:
16. - NO carbon=carbon double bonds
- straight structure
- tight packing --> reduces mobility (fluidity)
Answer:
saturated fats
