Osmosis: Plant Cells Osmosis is the?net movement of water molecules?from a region of?higher water potential?(dilute solution) to a region of?lower water potential?(concentrated solution), th...
The Process of Osmosis All cells are surrounded by a cell membrane which is?partially permeable Water can move in and out of cells by?osmosis Osmosis is the?diffusion of water molecules?from...
Diffusion & Facilitated Diffusion Diffusion is a type of?transportation?that occurs?across the cell membrane It can be defined as: The net movement, as a result of the random motion of i...
Cell Surface Membranes Phospholipids Form the basic structure of the membrane (phospholipid bilayer) The tails form a hydrophobic core comprising the innermost part of both the outer and inn...
Phospholipids, Cholesterol, Glycolipids, Proteins & Glycoproteins The cell membranes of all organisms generally have a similar structure Cell membranes contain several different types of...
Viruses Do Not Undergo Cell Division Viruses?are?non-cellular infectious particles?that straddle the boundary between ‘living’ and ‘non-living’ They are?much smaller?than?prokaryotic cells T...
Binary Fission of Prokaryotic Cells The process of cell division (binary fission) in prokaryotic cells is much simpler than mitosis in eukaryotic cells Prokaryotic cells do not possess: A nu...
Uncontrolled Cell Division & Cancer Cancers demonstrate how important it is that?cell division?is?precisely controlled, as cancers arise due to?uncontrolled mitosis Cancerous cells divid...
Maths Skill: Mitotic Index The mitotic index is the?proportion?of cells (in a group of cells or a sample of tissue) that are?undergoing mitosis The mitotic index can be calculated using the ...
