Biology 1001 Exam 2 (LSU-Hrincevich)
2025/2026 Exam Questions with 100%
Correct Answers | Latest Update
CHAPTER 5: Within the fluid mosaic of a plasma membrane, what is the
role of transport and channel proteins? - 🧠ANSWER ✔✔They permit salts
and sugars to move through the plasma membrane.
CHAPTER 5: If red blood cells are taken from the body and placed in a
hypertonic solution, what happens to the cells? - 🧠ANSWER ✔✔The cells
shrivel up because water leaves them.
CHAPTER 5: Plasma membranes are BEST described as a what? -
🧠ANSWER ✔✔single layer of phospholipids with tails pointed toward the
inside of the cell.
, CHAPTER 5: Osmosis moves water from a region of what to what? -
🧠ANSWER ✔✔low concentration of dissolved material to a region of high
concentration.
CHAPTER 5: More than half a century ago, two cell biologists published
details of their research involving isolated membrane vesicles from
chloroplasts. Normally, the fluid inside these vesicles is near neutral. In an
experiment, these membrane vesicles were soaked in an acidic solution
(pH 4) until the inside of the vesicle also became pH 4. Based on the
details provided in this scenario, by what mechanism could hydrogen ions
have crossed the vesicle membrane, and what do you think happened at
the molecular level? - 🧠ANSWER ✔✔Facilitated diffusion; hydrogen ions
moved into the vesicle through a channel.
CHAPTER 5: Suppose that plasma membranes were single layers of
phospholipids with heads facing the external environment. The interior of
this hypothetical cell would have to be what? - 🧠ANSWER ✔✔hydrophobic
and nonpolar.
CHAPTER 5: The cytoplasm of a certain cell, such as a neuron, already
has a high concentration of potassium ions. How can potassium ions
continue to enter the cell? - 🧠ANSWER ✔✔active transport
2025/2026 Exam Questions with 100%
Correct Answers | Latest Update
CHAPTER 5: Within the fluid mosaic of a plasma membrane, what is the
role of transport and channel proteins? - 🧠ANSWER ✔✔They permit salts
and sugars to move through the plasma membrane.
CHAPTER 5: If red blood cells are taken from the body and placed in a
hypertonic solution, what happens to the cells? - 🧠ANSWER ✔✔The cells
shrivel up because water leaves them.
CHAPTER 5: Plasma membranes are BEST described as a what? -
🧠ANSWER ✔✔single layer of phospholipids with tails pointed toward the
inside of the cell.
, CHAPTER 5: Osmosis moves water from a region of what to what? -
🧠ANSWER ✔✔low concentration of dissolved material to a region of high
concentration.
CHAPTER 5: More than half a century ago, two cell biologists published
details of their research involving isolated membrane vesicles from
chloroplasts. Normally, the fluid inside these vesicles is near neutral. In an
experiment, these membrane vesicles were soaked in an acidic solution
(pH 4) until the inside of the vesicle also became pH 4. Based on the
details provided in this scenario, by what mechanism could hydrogen ions
have crossed the vesicle membrane, and what do you think happened at
the molecular level? - 🧠ANSWER ✔✔Facilitated diffusion; hydrogen ions
moved into the vesicle through a channel.
CHAPTER 5: Suppose that plasma membranes were single layers of
phospholipids with heads facing the external environment. The interior of
this hypothetical cell would have to be what? - 🧠ANSWER ✔✔hydrophobic
and nonpolar.
CHAPTER 5: The cytoplasm of a certain cell, such as a neuron, already
has a high concentration of potassium ions. How can potassium ions
continue to enter the cell? - 🧠ANSWER ✔✔active transport
