5 Written questions
5 Matching questions
- Two types of Endocytosis:
- Membranes at Work 2. Kidney Dialysis
- Transport Across Cell Membranes: Concentration Gradient
- The activities of a living cell depend on the ability of its membrane to
- Active Transport
- a the difference in concentration between two areas for any given molecule produces a gradient or path of movement in which molecules move toward areas where the concentration of particles is lower
- molecules move down a concentration gradient
- b the movement of molecules and ions against the concentration gradient which requires ATP energy and carrier proteins to pump these molecules from an area of low solute concentration to an area of high solute concentration.
- c a) phagocytosis - when cells "eat" by taking in large particles or other cells
b) pinocytosis - when cells "drink" by taking in droplets of fluid
- d 1. transport raw materials into the cell (and out of)
2. transport manufactured products and wastes out of the cell
3. prevent unwanted matter from entering the cell
4. prevent the escape of matter needed to perform cellular functions
- e filters toxic wastes that accumulate in the blood while retaining necessary proteins, glucose, amino acids & ions
5 Multiple choice questions
- Loss of water in a plant cell resulting in WILTING
- diffusion of molecules across the cell membrane by way of transport proteins.
- movement across cell membranes without an input of energy
2 reasons molecules move.
1. Brownian Motion
2. Concentration gradients
- has a higher concentration of solute compared to the inside of the cell
5 True/False questions
Brownian Motion → has the same solute concentration on both sides of the cell membrane. Equilibrium has been reached. EQUAL FLOW of water into and out of the cell
Receptor - mediated endocytosi → receptors, like antennae, detect specific compounds or cells and bind with them, triggering endocytosis.
Isotonic solution → has a lower concentration of solute compared to inside the cell
Two types of transport proteins → have 3-D shapes that make them highly selective, recognizing atoms or molecules by shape, size or charge.
ENDOCYTOSIS → the reverse of endocytosis, whereby the membrane of vesicles or vacuoles fuses with the cell membrane and the stored contents are expelled from the cell.