Topic 8 Exchange And Trasnport Flashcards
What is label A?
Hydrophilic head
What is label B?
Extrinsic protein
What is label C?
Fatty acid tail
What is label C?
Carrier Protein
Which of the following is NOT a major component of the cell surface membrane?
Triglyceride
What is the approximate thickness of the plasma membrane?
7.5nm
Which of these relates to the diffusion of water molecules?
Osmosis
This process is the net movement of particles from an area of higher concentration to an area of lower concentration?
Diffusion
This process is the net movement of particles against the concentration gradient?
Active transport
What benefits arise from large surface area to volume ratios?
Efficient gas exchange, increased absorption
What is the formula for calculating surface area of a cube?
Surface area = 6 x (side length)^2
What is the surface area to volume ratio of a cube with side length 3cm?
2:1
What factors influence the diffusion rate?
Concentration gradient, thickness of exchange surface, surface area
True or False: Single-celled organisms have a low surface area to volume ratio.
False
What adaptations do multicellular organisms have for efficient gas exchange?
Specialized exchange organs, branching, folding
What is the role of the circulatory system in multicellular organisms?
Transport substances to and from individual cells
What is the significance of a higher surface area to volume ratio?
Faster rate of diffusion
Fill in the blank: The process of diffusion occurs across the _______.
cell-surface membrane
What is the surface area to volume ratio for a shape with surface area 54 cm² and volume 27 cm³?
2:1
What is the importance of maximizing surface area in biological systems?
Better absorption of materials
List some examples of specialized exchange surfaces in organisms.
- Lungs
- Alveoli
- Villi
- Microvilli
What is the approximate surface area of a cube with side length 3cm?
54 cm²
What is the approximate volume of a cube with side length 3cm?
27 cm³
