1|Page
Biology I Exam #2 | Comprehensive
Q&A For Certification Success 2026
cell theory - correct-answer -the cell is the fundamental unit of life in all
organisms & cells come only from preexisting cells
key functions of lipids - correct-answer -makes up cell membrane, energy storage
2 primary functions of the cell membrane - correct-answer -1. define cell
boundary
2. regulation of molecules
main components of the cell membrane - correct-answer -- lipids
- proteins
- carbohydrates
what contributes to the fluidity of a membrane? - correct-answer -lipid types &
characteristics of fatty acid chains
,2|Page
amphipathic - correct-answer -having both hydrophilic & hydrophobic regions
which part of a phospholipid is hydrophilic? - correct-answer -head
which part of a phospholipid is hydrophobic? - correct-answer -fatty acid tails
main function of a phospholipid - correct-answer -forms the cell membrane
lipid bilayer - correct-answer -2 layers of lipids
which part of the phospholipid is tucked inside the membrane? - correct-answer -
nonpolar, hydrophobic tail
why is the polar part of the phospholipid facing outward? - correct-answer -can
form bonds
, 3|Page
liposome - correct-answer -spherical bilayer structure
- forms in aqueous environment at neutral pH
why is pH important? - correct-answer -ensures polar head is in ionized form--
makes them hydrophilic
van der Waals forces - correct-answer -weak binding of temporarily polarized
molecules due to attraction of opposite charges
- helps w/ sticking of cholesterol/phospholipids in a cell membrane
saturated fats - correct-answer -- NO carbon=carbon double bonds
- straight structure
- tight packing --> reduces mobility (fluidity)
unsaturated fats - correct-answer -- carbon=carbon double bonds
- kinked structure
- reduced tightness of packing --> enhances mobility (fluidity)
Biology I Exam #2 | Comprehensive
Q&A For Certification Success 2026
cell theory - correct-answer -the cell is the fundamental unit of life in all
organisms & cells come only from preexisting cells
key functions of lipids - correct-answer -makes up cell membrane, energy storage
2 primary functions of the cell membrane - correct-answer -1. define cell
boundary
2. regulation of molecules
main components of the cell membrane - correct-answer -- lipids
- proteins
- carbohydrates
what contributes to the fluidity of a membrane? - correct-answer -lipid types &
characteristics of fatty acid chains
,2|Page
amphipathic - correct-answer -having both hydrophilic & hydrophobic regions
which part of a phospholipid is hydrophilic? - correct-answer -head
which part of a phospholipid is hydrophobic? - correct-answer -fatty acid tails
main function of a phospholipid - correct-answer -forms the cell membrane
lipid bilayer - correct-answer -2 layers of lipids
which part of the phospholipid is tucked inside the membrane? - correct-answer -
nonpolar, hydrophobic tail
why is the polar part of the phospholipid facing outward? - correct-answer -can
form bonds
, 3|Page
liposome - correct-answer -spherical bilayer structure
- forms in aqueous environment at neutral pH
why is pH important? - correct-answer -ensures polar head is in ionized form--
makes them hydrophilic
van der Waals forces - correct-answer -weak binding of temporarily polarized
molecules due to attraction of opposite charges
- helps w/ sticking of cholesterol/phospholipids in a cell membrane
saturated fats - correct-answer -- NO carbon=carbon double bonds
- straight structure
- tight packing --> reduces mobility (fluidity)
unsaturated fats - correct-answer -- carbon=carbon double bonds
- kinked structure
- reduced tightness of packing --> enhances mobility (fluidity)
