Chapter 3
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List basic tenets of the cell doctrine
All living things are composed of cells and cell products. A single cell is the smallest unit that exhibits all characteristics of life. All cells come from pre-existing cells.
Why is being small advantages to a cell
Obtained raw materials and get rid of waste
Describe how phospholipids are oriented in the plasma membrane and why the orient naturally that way
There arrange so nonpolar tails me in the center of the membrane
Define passive transport and name three methods
Passive transport’s transports a molecule without the cell needing to expand any energy. Diffusion through the lipid Bilayer. Diffusion through channel Facilitated transport
Comparing contrast endocytosis and exocytosis.
Endo moves cells going in. Exo moves cells out. Both move large molecules.
Describe the activity of the sodium potassium pump and its importance to a cell
Energy derived from breaking down ATP to transfer a sodium out of a cell and potassium in. helps get molecules uphill.
Explain what happens to a cell and high salts or low salt.
In high salt water diffuses causing it to shrink. In low salt water enters causing it to swell.
Define vesicles in name two types of vesicles.
Vesicles are membrane bound spheres that encloses something within the cell. Secretory vesicles. Endocytotic vesicles.
Describe what happens to the cells ability to produce ATP when oxygen is not available
It can be made for a while by anaerobic pathways.