1. Diffusion and Gradients
Flashcards
- Define diffusion in the context of cell biology.
- The movement of molecules from an area of higher concentration to an area of lower concentration.
- What is a concentration gradient?
- The difference in the concentration of a substance across a space.
- How does a concentration gradient relate to diffusion?
- It causes diffusion by providing the driving force for molecules to move from areas of high concentration to low concentration.
- Give an example of adaptive behavior that creates a concentration gradient.
- Breathing, which moves oxygen to areas of lower concentration.
Multiple-choice questions
- What does a concentration gradient primarily cause?
- a) Adaptive behavior
- b) Diffusion
- c) Osmosis
- d) Active transport
Answer: b) Diffusion. A concentration gradient, which is the difference in concentration of a substance across a space, causes diffusion. Substances move from an area of higher concentration to an area of lower concentration to balance the distribution.
- In the context of cell biology, what is diffusion?
- a) The movement of molecules from an area of lower concentration to higher concentration.
- b) The movement of molecules from an area of higher concentration to lower concentration.
- c) The maintenance of equal concentration of molecules in a cell.
- d) The process of cell division.
Answer: b) The movement of molecules from an area of higher concentration to lower concentration.. Diffusion is the movement of molecules from an area of higher concentration to an area of lower concentration. This movement aims to equalize the concentration throughout the space.
- What is the role of adaptive behavior in relation to diffusion and concentration gradients?
- a) It directly prevents the formation of concentration gradients.
- b) It creates concentration gradients.
- c) It has no effect on concentration gradients.
- d) It regulates the speed of diffusion.
Answer: b) It creates concentration gradients.. Adaptive behavior, such as breathing, creates concentration gradients by moving substances to areas where there is a difference in concentration. This behavior facilitates the process of diffusion.
2. Adaptive Behavior and Concentration Gradients
Flashcards
- What is a concentration gradient?
- A difference in the concentration of a substance across a space.
- Give an example of adaptive behavior that creates a concentration gradient.
- Breathing, which maintains oxygen and carbon dioxide gradients.
- In which direction do molecules move during diffusion?
- From an area of high concentration to an area of low concentration.
- What gases are shown diffusing in and out of the cell in the image?
- Oxygen (O2) diffuses in, and Carbon Dioxide (CO2) diffuses out.
Multiple-choice questions
- What does adaptive behavior create in the context of diffusion?
- a) A stable equilibrium
- b) A concentration gradient
- c) An isotonic solution
- d) A uniform distribution of molecules
Answer: b) A concentration gradient. Adaptive behavior, such as breathing, creates a concentration gradient by causing a difference in the concentration of molecules in different areas.
- What is the primary driving force behind diffusion?
- a) The need for active transport
- b) The presence of a concentration gradient
- c) The cell's energy consumption
- d) Osmotic pressure
Answer: b) The presence of a concentration gradient. Diffusion is primarily driven by the concentration gradient, where molecules move from an area of high concentration to an area of low concentration to reach equilibrium.
- According to the image, which molecules are shown diffusing in and out of the cell?
- a) Glucose and Amino Acids
- b) Water and Salts
- c) Oxygen and Carbon Dioxide
- d) Proteins and Lipids
Answer: c) Oxygen and Carbon Dioxide. The diagram explicitly shows oxygen (O2) diffusing into the cell and carbon dioxide (CO2) diffusing out of the cell.
3. Oxygen and Carbon Dioxide Diffusion in Cells
Flashcards
- What is a concentration gradient?
- The difference in concentration of a substance between two areas.
- Which gas diffuses into the cell?
- Oxygen (O2)
- Which gas diffuses out of the cell?
- Carbon Dioxide (CO2)
- What drives the movement of oxygen and carbon dioxide across cell membranes?
- Concentration gradient.
Multiple-choice questions
- What is the primary driving force behind the diffusion of oxygen and carbon dioxide in cells?
- a) Adaptive behavior of the cell
- b) Concentration gradient
- c) Cellular respiration rate
- d) Active transport mechanisms
Answer: b) Concentration gradient. Diffusion is driven by the concentration gradient, which is the difference in concentration of a substance between two areas. Molecules move from an area of high concentration to an area of low concentration.
- In the context of cellular respiration, which direction does oxygen typically diffuse?
- a) From inside the cell to outside the cell
- b) From outside the cell to inside the cell
- c) Equally in both directions
- d) It does not diffuse; it's actively transported
Answer: b) From outside the cell to inside the cell. Oxygen diffuses from outside the cell, where its concentration is typically higher, to inside the cell, where it is used in cellular respiration and its concentration is lower.
- What happens to the rate of diffusion as the concentration difference increases?
- a) The rate of diffusion decreases
- b) The rate of diffusion increases
- c) The rate of diffusion remains constant
- d) The rate of diffusion fluctuates randomly
Answer: b) The rate of diffusion increases. A larger concentration difference (gradient) results in a faster rate of diffusion because there is a stronger driving force for the molecules to move.
And 3 more flashcards and 6 more questions in the document.