Table of Contents
- 1 Are phagocytosis and pinocytosis active or passive?
- 2 Why is pinocytosis a form of endocytosis?
- 3 What is difference between phagocytosis and pinocytosis?
- 4 Is ATP consumption active or passive?
- 5 Is the movement of water along the concentration gradient?
- 6 Is simple diffusion active or passive?
- 7 What are the stages of phagocytosis?
- 8 What is the Order of phagocytosis?
Are phagocytosis and pinocytosis active or passive?
Exocytosis
| Table 1. Methods of Transport, Energy Requirements, and Types of Material Transported | |
|---|---|
| Transport Method | Active/Passive |
| Phagocytosis | Active |
| Pinocytosis and potocytosis | Active |
| Receptor-mediated endocytosis | Active |
Why is pinocytosis a form of endocytosis?
Generally, pinocytosis is a form of endocytosis in which small particles suspended in extracellular fluid are brought into the cell through the invagination of the lipid cell membrane (Elefant, 2012). The resulting vesicle can fuse with lysosomes in the cytoplasm to hydrolyze these particles.
When molecules move from high to low along a concentration gradient we say that they are moving the gradient?
19. When molecules move from high to low along a concentration gradient we say they are moving “DOWN”the gradient.
What is the shrinking of a plant cell membrane away from the cell wall when placed in a hypertonic solution?
plasmolysis
If a plant cell is placed in a hypertonic solution, the plant cell loses water and hence turgor pressure by plasmolysis: pressure decreases to the point where the protoplasm of the cell peels away from the cell wall, leaving gaps between the cell wall and the membrane and making the plant cell shrink and crumple.
What is difference between phagocytosis and pinocytosis?
While phagocytosis involves the ingestion of solid material, pinocytosis is the ingestion of surrounding fluid(s). This type of endocytosis allows a cell to engulf dissolved substances that bind to the cell membrane prior to internalization.
Is ATP consumption active or passive?
ATP is an energy molecule, and when hydrolysis happens, it gets broken down to release the energy that was stored in its chemical bonds. Transport that directly uses ATP for energy is considered primary active transport.
What is the importance of pinocytosis?
The main function of pinocytosis is to absorb extracellular fluids. It plays an important role in the uptake of nutrients along with the removal of waste products and signal transduction.
What is an example of pinocytosis?
An example of pinocytosis is observed in the microvilli of the small intestine to absorb nutrients from the lumen of the gastrointestinal tract. Similarly, it is also observed in cells in the ducts of the kidneys during the formation of urine.
Is the movement of water along the concentration gradient?
Osmosis is the movement of water through a semipermeable membrane according to the concentration gradient of water across the membrane, which is inversely proportional to the concentration of solutes.
Is simple diffusion active or passive?
Table: Simple vs Facilitated Diffusion
| Simple Diffusion | Facilitated Diffusion |
|---|---|
| Simple diffusion definition biology: a type of passive transport where molecules diffuse unassisted | Facilitated diffusion definition biology: a type of passive transport where molecules diffuse with assistance from membrane proteins |
What happens to blood cells in a hypertonic solution?
If you place an animal or a plant cell in a hypertonic solution, the cell shrinks, because it loses water ( water moves from a higher concentration inside the cell to a lower concentration outside ). A single animal cell ( like a red blood cell) placed in a hypotonic solution will fill up with water and then burst.
What is called plasmolysis?
Plasmolysis is the process of shrinkage or contraction of the protoplasm of a plant cell as a result of loss of water from the cell. Plasmolysis is one of the results of osmosis and occurs very rarely in nature, but it happens in some extreme conditions.
What are the stages of phagocytosis?
The stages of phagocytosis include the engulfment of a pathogen, the formation of a phagosome , the digestion of the pathogenic particle in the phagolysosome, and the expulsion of undigested materials from the cell.
What is the Order of phagocytosis?
Place the following steps of phagocytosis in the order that they occur: Endosome fuses with lysozome. Dendritic cell engulfs Rhinovirus. Epitopes are attached to MHC-II. Digestion of the Rhinovirus. MHC-II plus the attached epitope move to the outside of the dendritic cell.
Is phagocytosis a white blood cell?
Phagocytosis is the way in which white blood cells of the immune system such as neutrophils and macrophages, are able to engulf potentially harmful bacteria. This process of phagocytosis is also how many unicellular Protista such as Amoeba, are able to take in food particles.