Osmosis is a form of passive transport. Which defines osmosis?(1 point)
Responses
the movement of water across a semipermeable membrane up a concentration gradient from low to high, using energy
the movement of water across a semipermeable membrane up a concentration gradient from low to high, using energy
the movement of water across a semipermeable membrane down a concentration gradient from high to low, using no energy
the movement of water across a semipermeable membrane down a concentration gradient from high to low, using no energy
the movement of water across a semipermeable membrane up a concentration gradient from low to high, using no energy
the movement of water across a semipermeable membrane up a concentration gradient from low to high, using no energy
the movement of water across a semipermeable membrane down a concentration gradient from high to low, using energy
the movement of water across a semipermeable membrane down a concentration gradient from high to low, using no energy
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Question
Endocytosis and exocytosis are forms of active transport. What is active transport?(1 point)
Responses
the movement of molecules down a concentration gradient from high to low, using energy
the movement of molecules down a concentration gradient from high to low, using energy
the movement of molecules up a concentration gradient from low to high, using energy
the movement of molecules up a concentration gradient from low to high, using energy
the movement of molecules up a concentration gradient from low to high, using no energy
the movement of molecules up a concentration gradient from low to high, using no energy
the movement of molecules down a concentration gradient from high to low, using no energy
the movement of molecules against a concentration gradient from low to high, using energy
What does it mean for an environment to be isotonic?(1 point)
Responses
The concentration of solute is greater inside the cell than in the environment.
The concentration of solute is greater inside the cell than in the environment.
The concentration of solute in the environment and the concentration inside the cell are at equilibrium.
The concentration of solute in the environment and the concentration inside the cell are at equilibrium.
The concentration of solute is greater in the environment than inside the cell.
The concentration of solute is greater in the environment than inside the cell.
The concentration of solute in the environment is different from the concentration inside the cell.
The concentration of solute in the environment and the concentration inside the cell are at equilibrium.
Cells dispose of large waste molecules through a process called(1 point)
Responses
diffusion.
diffusion.
exocytosis.
exocytosis.
endocytosis.
endocytosis.
osmosis.
exocytosis.
A cell is dropped into a saltwater solution and shrivels up. You infer that, compared to the cell, the type of saltwater solution is(1 point)
Responses
hypertonic.
hypertonic.
tonic.
tonic.
isotonic.
isotonic.
hypotonic.
hypertonic.
The correct answer is:
The movement of water across a semipermeable membrane from an area of low solute concentration to an area of high solute concentration, using no energy.
To understand the concept of osmosis and determine the correct answer, follow these steps:
1. Read and understand the question: The question asks for the definition of osmosis and provides four options.
2. Break down the question: Osmosis is described as a form of passive transport. This means that it occurs spontaneously and does not require the input of energy.
3. Understand osmosis: Osmosis is the process by which water molecules move from an area of low solute concentration (high water concentration) to an area of high solute concentration (low water concentration) across a semipermeable membrane. This movement of water occurs in an attempt to equalize the concentration of solutes on both sides of the membrane.
4. Analyze the options:
a. Option 1: "the movement of water across a semipermeable membrane up a concentration gradient from low to high, using energy" - This option is incorrect because it states that energy is used in the process, but osmosis is a passive transport process and does not require energy.
b. Option 2: "the movement of water across a semipermeable membrane down a concentration gradient from high to low, using no energy" - This option is incorrect because it describes the opposite process, which is diffusion, not osmosis.
c. Option 3: "the movement of water across a semipermeable membrane up a concentration gradient from low to high, using no energy" - This option is correct. It accurately describes osmosis as the movement of water from low solute concentration to high solute concentration without the input of energy.
d. Option 4: "the movement of water across a semipermeable membrane down a concentration gradient from high to low, using energy" - This option is incorrect because it describes active transport, a process that requires energy input, rather than osmosis.
5. Choose the correct answer: Based on the analysis of the options, option 3 is the correct answer. Osmosis is defined as the movement of water across a semipermeable membrane from an area of low solute concentration to an area of high solute concentration, using no energy.