BMSC 207: Cell Membranes – Verified Questions & Answers for Exam Success | 2025 Exam
UPDATES.
About This Guide:
This targeted study guide focuses on the Cell Membranes unit from BMSC 207, covering everything from
membrane structure and fluidity to transport mechanisms and membrane potentials. Packed with
verified questions and clear, concise answers, it’s designed to help you prep smarter and feel confident
walking into your quiz, midterm, or exam.
Absorption - ✔✔-- from lumen to ECF
Active transport - ✔✔-- moves substances against concentration gradient (from an area of low to an area
of high concentration); supports disequilibrium
- Requires energy
- uses only carrier proteins
Adipose tissue vs skeletal muscle - ✔✔-Adipose:
- ~ 90% lipids, small fraction of water
Skeletal:
- ~75% water
~18% protein
Amphipathic - ✔✔-has both a hydrophilic and hydrophobic side
antiporter - ✔✔-A carrier protein that transports two molecules across the plasma membrane in opposite
directions.
Apical surface - ✔✔-free surface that faces the lumen of the organ
basolateral membrane - ✔✔-- non-free side, isn't facing the lumen
- links epithelium to underlying surface
- exposed to ECF
, bicarbonate (HCO3) is slightly elevated in which cellular fluid? (ECF or ICF) - ✔✔-ECF
Body cavities - ✔✔-Cranial, thoracic, pelvic
Can polar molecules diffuse across the cell membrane? what is an exception to this? - ✔✔-- no
- water is an exception because of the molecule's size (small)
Carrier proteins - ✔✔--a protein that transports substances across a cell membrane
- change conformation to move molecules
Cell membrane (plasma membrane) - ✔✔-- double layer (lipid bilayer) with phospholipids and protein
molecules inserted in them
- Carbohydrates are attached to extracellular side
Cell membrane composition (% of each) - ✔✔-- 55% proteins
- 45% lipids
- small amount of carbohydrates
- note not all membranes are the same
Channel proteins - ✔✔--provide corridors that allow a specific molecule or ion to cross the membrane
- include open channels "leak channels" and closed channels "gated channels"
Cholesterol Function - ✔✔--Increases viscosity, decreases permeability
- shimmies in between phospholipids ; extra security guard for the membrane
- makes membrane less delicate
Cl- entering the cell causes the cell to _____________ - ✔✔-hyperpolarize
UPDATES.
About This Guide:
This targeted study guide focuses on the Cell Membranes unit from BMSC 207, covering everything from
membrane structure and fluidity to transport mechanisms and membrane potentials. Packed with
verified questions and clear, concise answers, it’s designed to help you prep smarter and feel confident
walking into your quiz, midterm, or exam.
Absorption - ✔✔-- from lumen to ECF
Active transport - ✔✔-- moves substances against concentration gradient (from an area of low to an area
of high concentration); supports disequilibrium
- Requires energy
- uses only carrier proteins
Adipose tissue vs skeletal muscle - ✔✔-Adipose:
- ~ 90% lipids, small fraction of water
Skeletal:
- ~75% water
~18% protein
Amphipathic - ✔✔-has both a hydrophilic and hydrophobic side
antiporter - ✔✔-A carrier protein that transports two molecules across the plasma membrane in opposite
directions.
Apical surface - ✔✔-free surface that faces the lumen of the organ
basolateral membrane - ✔✔-- non-free side, isn't facing the lumen
- links epithelium to underlying surface
- exposed to ECF
, bicarbonate (HCO3) is slightly elevated in which cellular fluid? (ECF or ICF) - ✔✔-ECF
Body cavities - ✔✔-Cranial, thoracic, pelvic
Can polar molecules diffuse across the cell membrane? what is an exception to this? - ✔✔-- no
- water is an exception because of the molecule's size (small)
Carrier proteins - ✔✔--a protein that transports substances across a cell membrane
- change conformation to move molecules
Cell membrane (plasma membrane) - ✔✔-- double layer (lipid bilayer) with phospholipids and protein
molecules inserted in them
- Carbohydrates are attached to extracellular side
Cell membrane composition (% of each) - ✔✔-- 55% proteins
- 45% lipids
- small amount of carbohydrates
- note not all membranes are the same
Channel proteins - ✔✔--provide corridors that allow a specific molecule or ion to cross the membrane
- include open channels "leak channels" and closed channels "gated channels"
Cholesterol Function - ✔✔--Increases viscosity, decreases permeability
- shimmies in between phospholipids ; extra security guard for the membrane
- makes membrane less delicate
Cl- entering the cell causes the cell to _____________ - ✔✔-hyperpolarize
