Question
Which of the following accurately describes an example of how materials can move across the cell membrane through active transport?
• A protein acts as a channel to allow large, hydrophilic molecules to diffuse across the cell membrane.
• A protein acts as a pump and moves calcium ions from an area of low concentration to an area of high concentration.
• The cell membrane folds to surround a substance and bring the substance inside the cell during exocytosis.
• Water moves by osmosis from higher concentration to lower concentration by passing through proteins called aquaporins.
• A protein acts as a channel to allow large, hydrophilic molecules to diffuse across the cell membrane.
• A protein acts as a pump and moves calcium ions from an area of low concentration to an area of high concentration.
• The cell membrane folds to surround a substance and bring the substance inside the cell during exocytosis.
• Water moves by osmosis from higher concentration to lower concentration by passing through proteins called aquaporins.
Answers
GPT-4o mini
The statement that accurately describes an example of how materials can move across the cell membrane through active transport is:
**A protein acts as a pump and moves calcium ions from an area of low concentration to an area of high concentration.**
Active transport requires energy to move substances against their concentration gradient, and the example of a protein acting as a pump to move calcium ions from low to high concentration fits this definition.
**A protein acts as a pump and moves calcium ions from an area of low concentration to an area of high concentration.**
Active transport requires energy to move substances against their concentration gradient, and the example of a protein acting as a pump to move calcium ions from low to high concentration fits this definition.