Exam 2 BIO 1201 Updated Actual Questions and Correct Answers
(2026-2027)
Question 1.
What is passive transport?
Correct Answer: - no energy used
- moves molecules from high to low concentration (e.g., diffusion, osmosis)
Question 2.
What is an active transport?
Correct Answer: - requires energy (ATP)
- moves molecules from low to high concentration
Question 3.
What is bulk transport?
Correct Answer: - moves large molecules or lots of molecules at once
- requires energy (ATP)
- Endocytosis (into cell)
- Exocytosis (out of the cell)
Question 4.
What does amphipathic mean, and how do phospholipids represent this concept?
Correct Answer: Amphipathic means something has a water-loving part and a
water-fearing part. Phospholipids show this because they have a head that likes
water (face water) and tails that hate water (avoid water) and this helps them
form the cell membrane's structure.
Question 5.
What is the fluid mosaic model?
Correct Answer: the cell membrane is soft and flexible, made of fat molecules
with proteins mixed in, like a moving puzzle
, Question 6.
how do saturated and unsaturated fatty acids work with temperature?
Correct Answer: - Saturated fats: straight tails, pack tightly --> less fluid
(especially in cold)
- Unsaturated fats: bent tails, don't pack well --> more fluid (help in cold)
- at low temps, unsaturated fats keep the membrane from getting too stiff
- at high temps, saturated fats help prevent the membrane from becoming too
loose
Question 7.
What are types of membrane proteins and what are their properties?
Correct Answer: Types of Membrane Proteins:
- Integral proteins- inside membrane, help transport and signaling
- Peripheral proteins- on membrane surface; help support and signaling
- Lipid-anchored proteins- attached to lipids, involved in signaling Properties:
- Amphipathic
- Selective
- Dynamic
Question 8.
What is the role of carbohydrates in the membrane?
Correct Answer: carbohydrates help cells recognize each other, protect the cell,
and help cells stick together
Question 9.
what can, and cannot, permeate the membrane and why?
Correct Answer: Can permeate (pass):
- small, nonpolar molecules (oxygen, carbon dioxide)
- small polar molecules (water, but slowly) Cannot permeate (pass):
- large molecules
- charged ions (Na+, Cl-) Why:
- membrane's hydrophobic core blocks big and charged substances
(2026-2027)
Question 1.
What is passive transport?
Correct Answer: - no energy used
- moves molecules from high to low concentration (e.g., diffusion, osmosis)
Question 2.
What is an active transport?
Correct Answer: - requires energy (ATP)
- moves molecules from low to high concentration
Question 3.
What is bulk transport?
Correct Answer: - moves large molecules or lots of molecules at once
- requires energy (ATP)
- Endocytosis (into cell)
- Exocytosis (out of the cell)
Question 4.
What does amphipathic mean, and how do phospholipids represent this concept?
Correct Answer: Amphipathic means something has a water-loving part and a
water-fearing part. Phospholipids show this because they have a head that likes
water (face water) and tails that hate water (avoid water) and this helps them
form the cell membrane's structure.
Question 5.
What is the fluid mosaic model?
Correct Answer: the cell membrane is soft and flexible, made of fat molecules
with proteins mixed in, like a moving puzzle
, Question 6.
how do saturated and unsaturated fatty acids work with temperature?
Correct Answer: - Saturated fats: straight tails, pack tightly --> less fluid
(especially in cold)
- Unsaturated fats: bent tails, don't pack well --> more fluid (help in cold)
- at low temps, unsaturated fats keep the membrane from getting too stiff
- at high temps, saturated fats help prevent the membrane from becoming too
loose
Question 7.
What are types of membrane proteins and what are their properties?
Correct Answer: Types of Membrane Proteins:
- Integral proteins- inside membrane, help transport and signaling
- Peripheral proteins- on membrane surface; help support and signaling
- Lipid-anchored proteins- attached to lipids, involved in signaling Properties:
- Amphipathic
- Selective
- Dynamic
Question 8.
What is the role of carbohydrates in the membrane?
Correct Answer: carbohydrates help cells recognize each other, protect the cell,
and help cells stick together
Question 9.
what can, and cannot, permeate the membrane and why?
Correct Answer: Can permeate (pass):
- small, nonpolar molecules (oxygen, carbon dioxide)
- small polar molecules (water, but slowly) Cannot permeate (pass):
- large molecules
- charged ions (Na+, Cl-) Why:
- membrane's hydrophobic core blocks big and charged substances
