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APHY 201 - Midterm Questions and
Correct Answers/ Latest Update / Already
Graded
Describe the structure of the cell membrane?
Ans: Phospholipid bilayer, selectively permeable, proteins,
cholesterol, carbohydrates
What is solubility? Why is this important in regards to the cell
membrane?
Ans: Product of time & amount on the outside to get in.
Ability to dissolve.
Diffusion
Ans: Movement of molecule from higher concentration to
lower concentration
Osmosis
Ans: Movement of H2O across membrane, solute
concentration gradient
What is osmolarity?
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Osmotic pressure?
Ans: Number osmotically active particles per liter of solution.
Pressure exactly opposes given concentration
What is receptor mediated endocytosis?
Ans: Importing of lg molecules to cell using vesicles (ATP
required)
What is phagocytosis?
Ans: Engulfment of microorganisms
What is exocytosis?
Ans: Exporting lg molecules
What is facilitated diffusion?
Ans: Movement of molecules across cell membranes in
response to concentration gradient w/aid of membrane protein
What is active transport?
All rights reserved © 2025/ 2026 |
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Ans: Primary, requires input of energy from some outside
source.
High-energy phosphate bond of ATP
What are symporters (Cotransporters)
Ans: 2 or more molecules transport in same direction across
membrane
What are antiporters (Exchangers)
Ans: 2 or more molecules transport in opposite directions
What is cystic fibrosis?
Ans: Gene controls the movement of salt and water in and out
of your cells, so the lungs and digestive system become clogged
with mucus, making it hard to breathe and digest food
What are other categories of proteins found in the cell membrane?
Ans: Integral proteins,
Peripheral proteins,
Transmembrane,
Lipid anchored
All rights reserved © 2025/ 2026 |
APHY 201 - Midterm Questions and
Correct Answers/ Latest Update / Already
Graded
Describe the structure of the cell membrane?
Ans: Phospholipid bilayer, selectively permeable, proteins,
cholesterol, carbohydrates
What is solubility? Why is this important in regards to the cell
membrane?
Ans: Product of time & amount on the outside to get in.
Ability to dissolve.
Diffusion
Ans: Movement of molecule from higher concentration to
lower concentration
Osmosis
Ans: Movement of H2O across membrane, solute
concentration gradient
What is osmolarity?
All rights reserved © 2025/ 2026 |
, Page |2
Osmotic pressure?
Ans: Number osmotically active particles per liter of solution.
Pressure exactly opposes given concentration
What is receptor mediated endocytosis?
Ans: Importing of lg molecules to cell using vesicles (ATP
required)
What is phagocytosis?
Ans: Engulfment of microorganisms
What is exocytosis?
Ans: Exporting lg molecules
What is facilitated diffusion?
Ans: Movement of molecules across cell membranes in
response to concentration gradient w/aid of membrane protein
What is active transport?
All rights reserved © 2025/ 2026 |
, Page |3
Ans: Primary, requires input of energy from some outside
source.
High-energy phosphate bond of ATP
What are symporters (Cotransporters)
Ans: 2 or more molecules transport in same direction across
membrane
What are antiporters (Exchangers)
Ans: 2 or more molecules transport in opposite directions
What is cystic fibrosis?
Ans: Gene controls the movement of salt and water in and out
of your cells, so the lungs and digestive system become clogged
with mucus, making it hard to breathe and digest food
What are other categories of proteins found in the cell membrane?
Ans: Integral proteins,
Peripheral proteins,
Transmembrane,
Lipid anchored
All rights reserved © 2025/ 2026 |
