Biology A Unit 3: Lessons 11-14 Fall 2023 with complete
solution
Lesson 11:
Lesson 11:
Phospholipids line up so that their heads point outward, toward water, while their
tails point inward.
What is this double layer of phospholipids called?
the lipid bilayer
What does hydrophobic mean?
lacking an affinity for, or attraction to, water
Study the image.
https://cdstools.flipswitch.com/asset/media/1157307
What type of membrane protein does label A point to?
glycoprotein
Which of these are functions of membrane proteins?
Select all that apply.
to send signals across the cell membrane
to help move molecules across the membrane
to serve as identification for the cell
The tail of a phospholipid avoids interacting with water.
What term describes this?
hydrophobic
What molecules are found in the structure of cell membranes?
Select all that apply.
phospholipids
proteins
carbohydrates
Study the image.
https://cdstools.flipswitch.com/asset/media/1156531
Which membrane component would help ions to travel in and out of a cell?
, XXX WRONG XXX
C
Which statement best describes the fluid mosaic model?
The fluid mosaic model shows a cell membrane with a pattern-like structure and
flexibility.
Study the image.
https://cdstools.flipswitch.com/asset/media/1156531
Which membrane component is a channel protein?
B
What does hydrophilic mean?
having a tendency to interact with water
What is the function of channel proteins?
to allow specific ions or molecules to pass freely
What is the function of receptor proteins?
to detect outside conditions and signal the information to the inside of the cell
What is the function of the cell membrane's selective permeability?
The selectively permeable membrane allows only certain substances to enter or exit the
cell.
Lesson 12:
Lesson 12:
Which statement describes how molecules move when there is a concentration
gradient?
Molecules move from areas of high concentration to areas of low concentration to
restore equilibrium.
If a cell is in a hypotonic solution, which statement is true about water movement
and the cell?
More water enters the cell than leaves the cell.
True or False?
Facilitated transport does not require the cell to use energy because moving
molecules from areas of higher concentration to areas of lower concentration is
powered by diffusion.
True
How are channel and carrier proteins different?
Select all that apply.
Carrier proteins can allow much larger substances to cross the membrane than channel
proteins do.
Carrier proteins undergo a shape change as they move substances across the
membrane, while channel proteins do not.
solution
Lesson 11:
Lesson 11:
Phospholipids line up so that their heads point outward, toward water, while their
tails point inward.
What is this double layer of phospholipids called?
the lipid bilayer
What does hydrophobic mean?
lacking an affinity for, or attraction to, water
Study the image.
https://cdstools.flipswitch.com/asset/media/1157307
What type of membrane protein does label A point to?
glycoprotein
Which of these are functions of membrane proteins?
Select all that apply.
to send signals across the cell membrane
to help move molecules across the membrane
to serve as identification for the cell
The tail of a phospholipid avoids interacting with water.
What term describes this?
hydrophobic
What molecules are found in the structure of cell membranes?
Select all that apply.
phospholipids
proteins
carbohydrates
Study the image.
https://cdstools.flipswitch.com/asset/media/1156531
Which membrane component would help ions to travel in and out of a cell?
, XXX WRONG XXX
C
Which statement best describes the fluid mosaic model?
The fluid mosaic model shows a cell membrane with a pattern-like structure and
flexibility.
Study the image.
https://cdstools.flipswitch.com/asset/media/1156531
Which membrane component is a channel protein?
B
What does hydrophilic mean?
having a tendency to interact with water
What is the function of channel proteins?
to allow specific ions or molecules to pass freely
What is the function of receptor proteins?
to detect outside conditions and signal the information to the inside of the cell
What is the function of the cell membrane's selective permeability?
The selectively permeable membrane allows only certain substances to enter or exit the
cell.
Lesson 12:
Lesson 12:
Which statement describes how molecules move when there is a concentration
gradient?
Molecules move from areas of high concentration to areas of low concentration to
restore equilibrium.
If a cell is in a hypotonic solution, which statement is true about water movement
and the cell?
More water enters the cell than leaves the cell.
True or False?
Facilitated transport does not require the cell to use energy because moving
molecules from areas of higher concentration to areas of lower concentration is
powered by diffusion.
True
How are channel and carrier proteins different?
Select all that apply.
Carrier proteins can allow much larger substances to cross the membrane than channel
proteins do.
Carrier proteins undergo a shape change as they move substances across the
membrane, while channel proteins do not.
