Nutrients enter a cell ______ the concentration gradient by the process of _______. Responses A with; diffusionwith; diffusion B against; osmosisagainst; osmosis C against; diffusionagainst; diffusion D with; endocytosis
B against; osmosis
The correct answer is: A) with; diffusion
Nutrients enter a cell with the concentration gradient by the process of diffusion.
In order to determine the correct answer, let's first understand the concepts involved.
Concentration gradient refers to the difference in concentration of a substance between two areas. When a substance moves from an area of higher concentration to an area of lower concentration, it is said to move "with" the concentration gradient. Conversely, when it moves from an area of lower concentration to an area of higher concentration, it is moving "against" the concentration gradient.
Now, let's consider the different processes mentioned:
1. Diffusion: Diffusion is the movement of molecules or ions from an area of higher concentration to an area of lower concentration. This process occurs naturally and does not require any additional energy.
2. Osmosis: Osmosis is a type of diffusion that specifically refers to the movement of water molecules across a selectively permeable membrane, such as the cell membrane.
3. Endocytosis: Endocytosis is a process by which a cell takes in substances from the external environment by engulfing them with its membrane. It requires energy and is used for larger molecules or particles that cannot pass through the cell membrane via simple diffusion.
Now, let's analyze the options:
A. "With" the concentration gradient and "diffusion": This is a correct combination. Nutrients entering the cell with the concentration gradient can occur through simple diffusion.
B. "Against" the concentration gradient and "osmosis": This combination is not accurate. Osmosis refers specifically to the movement of water molecules across a membrane and does not involve going against the concentration gradient.
C. "Against" the concentration gradient and "diffusion": This combination is not entirely accurate. Diffusion usually occurs "with" the concentration gradient, so the movement of nutrients against the concentration gradient is not typical for diffusion.
D. "With" the concentration gradient and "endocytosis": This combination is not accurate. Endocytosis is an active process that requires energy, and it is used for larger substances, rather than nutrients that can diffuse across the membrane.
Based on the explanations provided, the correct answer is A. Nutrients enter a cell with the concentration gradient by the process of diffusion.