Biology
- Membrane Systems
Endoplasmic reticulum (ER) consists of a series of membranes creating channels within the cytoplasm, which are continuous with the nuclear membrane. They also form sheets that enclose cellular spaces called cisternae. ER provides a large surface area...
- #27 Summary Of Cell Membrane
1 The basic structure of a membrane is a 7 nm thick phospholipid bilayer with protein molecules spanning the bilayer or within one or other layer. Phospholipids and some proteins move within the layers. Hence the structure is described as a fluid mosaic...
- # 25 Passive And Active Transport Across Cell Membranes
Substances can enter or leave a cell in 2 ways: 1) Passive a) Simple Diffusion b) Facilitated Diffusion c) Osmosis (water only) 2) Active a) Molecules b) Particles I. Passive transport across cell membranes 1. Diffusion Molecules and ions move...
- #24 Cell Membranes - Fluid Mosaic Model Of The Plasma Menbrane
The fluid-mosaic model describes the plasma membrane that surrounds animal cell. The membrane has 2 layers of phospholipids (fats with phosphorous attached), which at body temperature are like vegetable oil (fluid). 1. Fluid Mosaic Model Because...
- #38.1 Transport In Multicellular Plants - Syllabus 2015
? The need for, and functioning of, a transport system in multicellular plants Learning Outcomes Candidates should be able to: (a) explain the need for transport systems in multicellular plants and animals in terms of size and surface area to...
Biology
#23.1 Cell membranes and transport - Syllabus 2015
? Fluid mosaic model of membrane structure
? Movement of substances into and out of cells
Learning Outcomes
Candidates should be able to:
(a) describe and explain the fluid mosaic model of membrane structure, including an outline of the roles of phospholipids, cholesterol, glycolipids, proteins and glycoproteins;
(b) outline the roles of cell surface membranes;
(c) describe and explain the processes of diffusion, facilitated diffusion, osmosis, active transport,
endocytosis and exocytosis (terminology described in the IOB?s publication Biological Nomenclature
should be used; see also section 5; no calculations involving water potential will be set);
(d) [PA] investigate the effects on plant cells and the effect on animal cells of immersion in solutions of different concentrations of solutions (with different water potentials);
(e) use the knowledge gained in this section in new situations or to solve related problems.
? Movement of substances into and out of cells
Learning Outcomes
Candidates should be able to:
(a) describe and explain the fluid mosaic model of membrane structure, including an outline of the roles of phospholipids, cholesterol, glycolipids, proteins and glycoproteins;
(b) outline the roles of cell surface membranes;
(c) describe and explain the processes of diffusion, facilitated diffusion, osmosis, active transport,
endocytosis and exocytosis (terminology described in the IOB?s publication Biological Nomenclature
should be used; see also section 5; no calculations involving water potential will be set);
(d) [PA] investigate the effects on plant cells and the effect on animal cells of immersion in solutions of different concentrations of solutions (with different water potentials);
(e) use the knowledge gained in this section in new situations or to solve related problems.
- Membrane Systems
Endoplasmic reticulum (ER) consists of a series of membranes creating channels within the cytoplasm, which are continuous with the nuclear membrane. They also form sheets that enclose cellular spaces called cisternae. ER provides a large surface area...
- #27 Summary Of Cell Membrane
1 The basic structure of a membrane is a 7 nm thick phospholipid bilayer with protein molecules spanning the bilayer or within one or other layer. Phospholipids and some proteins move within the layers. Hence the structure is described as a fluid mosaic...
- # 25 Passive And Active Transport Across Cell Membranes
Substances can enter or leave a cell in 2 ways: 1) Passive a) Simple Diffusion b) Facilitated Diffusion c) Osmosis (water only) 2) Active a) Molecules b) Particles I. Passive transport across cell membranes 1. Diffusion Molecules and ions move...
- #24 Cell Membranes - Fluid Mosaic Model Of The Plasma Menbrane
The fluid-mosaic model describes the plasma membrane that surrounds animal cell. The membrane has 2 layers of phospholipids (fats with phosphorous attached), which at body temperature are like vegetable oil (fluid). 1. Fluid Mosaic Model Because...
- #38.1 Transport In Multicellular Plants - Syllabus 2015
? The need for, and functioning of, a transport system in multicellular plants Learning Outcomes Candidates should be able to: (a) explain the need for transport systems in multicellular plants and animals in terms of size and surface area to...