Bio 201: Exam 1 (Chapter 3 Cells and
Membrane Transport) UPDATED ACTUAL
Exam Questions and CORRECT Answers
Explain how compartmentalization of cells relates to the complexity of an organism -
CORRECT ANSWER - The complexity of multicellular organisms is due to the
organization of specialized organs
Cells in tissues are specifically designed to perform different tasks
Compartmentalization within eukaryotic cells allows them to do this
Draw and label the components of a typical cell, including the organelles - CORRECT
ANSWER -
Selective permeability - CORRECT ANSWER - Allows some things through, and
prevents other things from entering and leaving the cell
Structure of a plasma membrane:
Which portions are hydrophyllic and hydrophobic? - CORRECT ANSWER - A barrier
and a gateway between the cytoplasm and Extra Cellular Fluid.
Called a Phospholipid bilayer because the structure is composed of TWO layers of
phospholipids.
Explain why a plasma membrane can be described as a "fluid-mosaic" - CORRECT
ANSWER - The plasma membrane is described as a fluid mosaic model because its made
up of a phospholipid bilayer, allowing it easily to bend and move along without breaking or
ripping the membrane due to the hydrophobic and hydrophilic poles of the bilayer.
, Draw and label the components of a plasma membrane - CORRECT ANSWER -
List the 6 types of membrane proteins and describe their functions - CORRECT
ANSWER - - Channel/ carrier proteins -> passive transport across the membrane
- Protein pumps -> active transport across the membrane
- Receptor proteins ->hormone binding and recognition
- Enzymes -> used in cell surface reactions
- Adhesion proteins -> binding cells together
- Neurotransmitter receptors -> communication between cells
Glycocalyx (Structure & function) - CORRECT ANSWER - Unique fuzzy coat external to
the plasma membrane
Functions: protection, immunity to infection, defense against cancer, transport compatibility, cell
adhesion, fertilization, embryonic development
Microvilli (Structure & function) - CORRECT ANSWER - Extensions of membrane (1-
2um)
Function: to increase cell's surface area, 15-40 times more absorptive surface area
Cytoskeleton (Structure & function) - CORRECT ANSWER - A network of connected
filaments and tubules
-Extends from nucleus to plasma membrane
Membrane Transport) UPDATED ACTUAL
Exam Questions and CORRECT Answers
Explain how compartmentalization of cells relates to the complexity of an organism -
CORRECT ANSWER - The complexity of multicellular organisms is due to the
organization of specialized organs
Cells in tissues are specifically designed to perform different tasks
Compartmentalization within eukaryotic cells allows them to do this
Draw and label the components of a typical cell, including the organelles - CORRECT
ANSWER -
Selective permeability - CORRECT ANSWER - Allows some things through, and
prevents other things from entering and leaving the cell
Structure of a plasma membrane:
Which portions are hydrophyllic and hydrophobic? - CORRECT ANSWER - A barrier
and a gateway between the cytoplasm and Extra Cellular Fluid.
Called a Phospholipid bilayer because the structure is composed of TWO layers of
phospholipids.
Explain why a plasma membrane can be described as a "fluid-mosaic" - CORRECT
ANSWER - The plasma membrane is described as a fluid mosaic model because its made
up of a phospholipid bilayer, allowing it easily to bend and move along without breaking or
ripping the membrane due to the hydrophobic and hydrophilic poles of the bilayer.
, Draw and label the components of a plasma membrane - CORRECT ANSWER -
List the 6 types of membrane proteins and describe their functions - CORRECT
ANSWER - - Channel/ carrier proteins -> passive transport across the membrane
- Protein pumps -> active transport across the membrane
- Receptor proteins ->hormone binding and recognition
- Enzymes -> used in cell surface reactions
- Adhesion proteins -> binding cells together
- Neurotransmitter receptors -> communication between cells
Glycocalyx (Structure & function) - CORRECT ANSWER - Unique fuzzy coat external to
the plasma membrane
Functions: protection, immunity to infection, defense against cancer, transport compatibility, cell
adhesion, fertilization, embryonic development
Microvilli (Structure & function) - CORRECT ANSWER - Extensions of membrane (1-
2um)
Function: to increase cell's surface area, 15-40 times more absorptive surface area
Cytoskeleton (Structure & function) - CORRECT ANSWER - A network of connected
filaments and tubules
-Extends from nucleus to plasma membrane
