BIOL 1201: Biology for Science Majors 1 Biology I Exam
#2 Louisiana State University and Agricultural &
Mechanical College Questions with 100% Verified
Answers Latest Update
Question: cell theory
Answer:
the cell is the fundamental unit of life in all organisms & cells come only from preexisting
cells
Question: key functions of lipids
Answer:
makes up cell membrane, energy storage
Question: 2 primary functions of the cell membrane
Answer:
1. define cell boundary
2. regulation of molecules
Question: main components of the cell membrane
Answer:
- lipids
- proteins
- carbohydrates
Question: what contributes to the fluidity of a membrane?
Answer:
lipid types & characteristics of fatty acid chains
Question: amphipathic
Answer:
having both hydrophilic & hydrophobic regions
Question: which part of a phospholipid is hydrophilic?
Answer:
head
,Question: which part of a phospholipid is hydrophobic?
Answer:
fatty acid tails
Question: main function of a phospholipid
Answer:
forms the cell membrane
Question: lipid bilayer
Answer:
2 layers of lipids
Question: which part of the phospholipid is tucked inside the membrane?
Answer:
nonpolar, hydrophobic tail
Question: why is the polar part of the phospholipid facing outward?
Answer:
can form bonds
Question: liposome
Answer:
spherical bilayer structure
- forms in aqueous environment at neutral pH
, Question: why is pH important?
Answer:
ensures polar head is in ionized form--makes them hydrophilic
Question: 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: saturated fats
Answer:
- NO carbon=carbon double bonds
- straight structure
- tight packing --> reduces mobility (fluidity)
Question: unsaturated fats
Answer:
- carbon=carbon double bonds
- kinked structure
- reduced tightness of packing --> enhances mobility (fluidity)
Question: cholesterol
Answer:
makes up 30% of cell membrane
Question: which part of cholesterol is hydrophilic?
Answer:
hydroxyl group on steroid ring A
#2 Louisiana State University and Agricultural &
Mechanical College Questions with 100% Verified
Answers Latest Update
Question: cell theory
Answer:
the cell is the fundamental unit of life in all organisms & cells come only from preexisting
cells
Question: key functions of lipids
Answer:
makes up cell membrane, energy storage
Question: 2 primary functions of the cell membrane
Answer:
1. define cell boundary
2. regulation of molecules
Question: main components of the cell membrane
Answer:
- lipids
- proteins
- carbohydrates
Question: what contributes to the fluidity of a membrane?
Answer:
lipid types & characteristics of fatty acid chains
Question: amphipathic
Answer:
having both hydrophilic & hydrophobic regions
Question: which part of a phospholipid is hydrophilic?
Answer:
head
,Question: which part of a phospholipid is hydrophobic?
Answer:
fatty acid tails
Question: main function of a phospholipid
Answer:
forms the cell membrane
Question: lipid bilayer
Answer:
2 layers of lipids
Question: which part of the phospholipid is tucked inside the membrane?
Answer:
nonpolar, hydrophobic tail
Question: why is the polar part of the phospholipid facing outward?
Answer:
can form bonds
Question: liposome
Answer:
spherical bilayer structure
- forms in aqueous environment at neutral pH
, Question: why is pH important?
Answer:
ensures polar head is in ionized form--makes them hydrophilic
Question: 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: saturated fats
Answer:
- NO carbon=carbon double bonds
- straight structure
- tight packing --> reduces mobility (fluidity)
Question: unsaturated fats
Answer:
- carbon=carbon double bonds
- kinked structure
- reduced tightness of packing --> enhances mobility (fluidity)
Question: cholesterol
Answer:
makes up 30% of cell membrane
Question: which part of cholesterol is hydrophilic?
Answer:
hydroxyl group on steroid ring A
