Bio 161 Exam 1 John Waters quizzes with
Complete Solutions 100% Correct | New
Update 2025
hydrophobic - ANSWERS Term used to describe molecules that do not interact
with water
hydrophilic - ANSWERS Term used to describe molecules that can readily
interact with water
semi-permeable membrane - ANSWERS A barrier that allows some things to
enter but not others
glycerol backbone - ANSWERS Holds the phosphate head to the fatty acid tails
of a phospholipid
channel proteins - ANSWERS allows movement of molecules across a cell
membrane, DOWN their concentration gradient from high concentration to low
concentration
carrier protein - ANSWERS Can help move of molecules across a cell
membrane UP their concentration gradient from low concentration to high
concentration
, The interior part (core) of a cell membrane is hydrophilic (can interact with water).
- ANSWERS False
The "core" of a lipid bilayer is the location of the fatty acids tails. These long,
carbon tails are hydrophobic, so the cell membrane core is hydrophobic (water or
the polar/charged molecules cannot easily pass through).
Phospholipids contain three fatty acid tails - ANSWERS False
Phospholipids have two fatty acids tail. Triglycerides, another type of lipid, have
three fatty acid tails (tri=three
Channel proteins typically require ATP (the input of energy) to transport
molecules across the cell membrane. - ANSWERS False
Channel proteins rely on a concentration gradient (from high to low) to allow
molecules to "diffuse" through the membrane. Diffusion does not require input of
energy.
Which of the following molecules is small and non-polar? - ANSWERS oxygen
Which of the following molecules is large and polar? - ANSWERS glucose
How many layers of phospholipids make up a typical cell membrane? -
ANSWERS two
Which part of a phospholipid interacts with water? - ANSWERS phosphate
head
Complete Solutions 100% Correct | New
Update 2025
hydrophobic - ANSWERS Term used to describe molecules that do not interact
with water
hydrophilic - ANSWERS Term used to describe molecules that can readily
interact with water
semi-permeable membrane - ANSWERS A barrier that allows some things to
enter but not others
glycerol backbone - ANSWERS Holds the phosphate head to the fatty acid tails
of a phospholipid
channel proteins - ANSWERS allows movement of molecules across a cell
membrane, DOWN their concentration gradient from high concentration to low
concentration
carrier protein - ANSWERS Can help move of molecules across a cell
membrane UP their concentration gradient from low concentration to high
concentration
, The interior part (core) of a cell membrane is hydrophilic (can interact with water).
- ANSWERS False
The "core" of a lipid bilayer is the location of the fatty acids tails. These long,
carbon tails are hydrophobic, so the cell membrane core is hydrophobic (water or
the polar/charged molecules cannot easily pass through).
Phospholipids contain three fatty acid tails - ANSWERS False
Phospholipids have two fatty acids tail. Triglycerides, another type of lipid, have
three fatty acid tails (tri=three
Channel proteins typically require ATP (the input of energy) to transport
molecules across the cell membrane. - ANSWERS False
Channel proteins rely on a concentration gradient (from high to low) to allow
molecules to "diffuse" through the membrane. Diffusion does not require input of
energy.
Which of the following molecules is small and non-polar? - ANSWERS oxygen
Which of the following molecules is large and polar? - ANSWERS glucose
How many layers of phospholipids make up a typical cell membrane? -
ANSWERS two
Which part of a phospholipid interacts with water? - ANSWERS phosphate
head
