One’s body is made of 70% of water that in which is the main component of the cells within one’s bodies. Within these cells, there are particles that move inside and outside through a semi-permeable membrane. This process is called diffusion. In diffusion, particles move in motion at a random speed from a high concentration to an area of low concentration until all of the molecules are dispersed evenly. It is important to remember that involvement with diffusion depends on the concentration. The…
mapping structures such as lobes, cortexes, and regions. As modern medicine continues to make advancements so does the understanding of complex processes which take place inside of the human body such as the firing of action potentials in neuronal cells in the brain. The research presented in the paper “High-Fidelity optical reporting of neuronal electrical activity with an ultrafast fluorescent voltage sensor” shows just how far brain mapping has come and how far it still has to go before all…
Cell Transport Permeability and Mechanisms
The smallest functional unit of life is the definition of a cell. Smaller than the cell are the chemical processes that allow the cell to live. While cell have many different functions, the most basic is making proteins which produces energy by the devouring of glucose. The most interesting part of the cell, because of its complexity, would have to be the plasma membrane. Not…
Fluid Mosaic model of the cell membrane and describe the functions of the proteins that are embedded in the membrane.
The Fluid Mosaic model of the cell membrane is a hypothesis that describes the phospholipid bilayer and it proteins. It states that the membrane is flexible - fluid - and has various proteins embedded in it - a mosaic. These structures are in constant motion. Proposed by Singer and NIcolson in 1972, they asserted that proteins are inserted in the membrane, with the hydrophobic…
Organelles of Animal Cells
~A large, round organelle visible under the microscope.
• Controls the cell’s activities
• Controls cell reproduction
Contains genetic material - DNA that makes up the genes and chromosome.
~Made of dozens of different proteins as well as RNA, also found in large numbers in the cytoplasm of living cells.
Ribosome are typically composed of two subunits:
• Large subunit
• Small subunit
“ Free” Ribosome makes…
Membrane fusion is a function of cell division and cell growth. The machinery used in membrane fusion is also a component of memory and learning. SNARE (soluble N-ethylmaleimide-sensitive fusion protein attachment protein receptors) proteins function in membrane fusion. They also ensure specificity in regulating membrane docking and fusion in exocytosis process and at the pre-synaptic plasma membrane. There are questions regarding how SNARE proteins specificity is enacted and…
followed by an increase in the permeability of the outer membrane (OM) of the bacterial cell which allows the efflux of essential ions and nutrients. Although the exact process is not very clear, several mechanisms have been proposed to explain the behaviour of AMPs, mainly (1) carpet-like mechanism (2) barrel-stave mechanism and (3) toroidal mechanism. 
In the carpet-like mechanism, the AMPs initially bind to the surface of the target cell membrane and cover it partially or…
disrupts membranes by a number of methods. In particular what you
must remember is, the size and fluidity of the membrane has a lot to do
with the outside and inside environment. This environment consists of how
much water, salts etc are in the cell versus out of the cell. Adding
ethanol disrupts much of this.
1. Ethanol is permeable to cell membranes. Because of the nature of
ethanol as a chemical is it able to get into the cell very easily. This
disrupts the balance of the cells'…
The cell is the basic unit of life and is the smallest structure that can live an independent life. In 1665, Robert Hook was the first person to identify cells and name them. He also noticed that plants were made up of cells and this finding introduced the beginning of cell theory. Cell theory summaries Hook’s findings that cells make up all living organism, can only be produced from pre-existing cells and are the smallest living organism. The size of the cells is due a dependence on diffusion…
the thylakoid membranes.
b-No. Cyanobacteria do not have distinct nuclei.
2-They were much smaller by comparison.
a-I think we decided in class to call them a brick prism.
b-I recall the concensus was 2 layers at minimum.
c-The cell wall surrounds the cell membrane and provides
these cells with structural support and protection. In addition,
the cell wall acts…