PSU Bio 161 Exam 1
CQ/Preweek/Wrapup (Cell Structure)
Questions And Answers With Verified
Solutions Already Passed (GRADED A+)
Hydrophobic - ANSWER✔✔ used to describe molecules that do not interact with
water
Hydrophilic - ANSWER✔✔ used to describe molecules that can readily interact
with water
Semi-permeable - ANSWER✔✔ A barrier that allows some things to enter but not
others
Glycerol Backbone - ANSWER✔✔ holds the phosphate head to the fatty acid tails
of a phospholipid
Channel Protein - ANSWER✔✔ Allows movement of molecules across a cell
membrane, DOWN their concentration gradient from high to low concentration
Carrier Protein - ANSWER✔✔ Can help move of molecules across a cell
membrane UP their concentration gradient from low to high concentration
T/F?
The interior part (core) of a cell membrane is hydrophilic (can interact with water)
- ANSWER✔✔ False
the "core" of a lipid bilayer is the location of the fatty acids tail. These long, carbon
tails are hydrophobic, so the cell membrane core is hydrophobic (water or the
polar/ charged molecules cannot easily pass through)
T/F?
Phospholipids contain 3 fatty acid tails - ANSWER✔✔ False
They have 2 fatty acid tails.
T/F?
, Channel Proteins typically require ATP (the input of energy) to transport
molecules across the cell membrane - ANSWER✔✔ False
Channel proteins rely on a concentration gradient (from high to low) to allow
molecules to "diffuse" through the membrane. Diffusion doesn't require input of
energy
Which of the following molecules is small and non polar?
-Glucose
-Water
-Oxygen
-Benzene - ANSWER✔✔ Oxygen
Which of the following molecules is large and polar?
-Glucose
-Water
-Oxygen
-Benzene - ANSWER✔✔ Glucose
How many layers of phospholipids make up a typical cell membrane?
-One
-Two
-Three
-Four - ANSWER✔✔ Two
the cell membrane is a lipid bilayer (bi=two)
Which part of a phospholipid interacts with water?
-Phosphate head
-Glycerol Backbone
-Fatty acid Tails - ANSWER✔✔ Phosphate Head
The phosphate head of phospholipids typically has a negative charge and,
therefore, can interact with polar water
Which of the following organelles primarily consists of proteins?
-Plasma Membrane
-Endoplasmic Reticulum
-Ribosome
-Golgi Body - ANSWER✔✔ Ribosome
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