Sbi3Ue Exam Notes Essay

1942 Words Sep 11th, 2012 8 Pages
SBI3UE Examination Notes
By: Gursangat Sidhu and Derek Meng Unit 1 - The Cell

Unit 2 - The Chemical Basis of Life Part 1 - Molecules of Life Part 2 - DNA Replication and Protein Synthesis Enzymes DNA Structure DNA Replication Protein Synthesis Overview Transcription Translation Mutations Part 3 - Cellular Respiration and Photosynthesis Unit 3 - Genetics

Unit 1 - The Cell
Cell Theory: Cell theory: refers to the idea that cells are the basic unit of structure in every living thing. It states that: ● New cells are formed from other existing cells, ● the cell is a fundamental unit of structure, ● function and organization in all living organisms.

Eukaryotic and Prokaryotic Cells

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Prokaryotic ● ● ● ● ● ● Have pili No nucleus
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Endocytosis: When larger macromolecules are needed to enter the cell portions of the membranes are pinched to allow intake. ● Phagocytosis - Large solid particles

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Pinocytosis - Fluid Receptor-mediated Endocytosis - Specific substances as dictated by receptor

Exocytosis: Allows the particles to leave. The Golgi apparatus packages specific substances into a vesicle, which then leave at the cell membrane. the vesicle merges with the cell membrane in the process.

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Protein Pumps: Sodium-Potassium Pump. Cell wants high concentration of Potassium inside, and low concentration of Sodium Outside. ● A protein that when opened facing outside has a high affinity for Potassium ● A protein then when opened facing inside, has a high affinity for Sodium. ● ATP allows for the changing of shape. ● This allows for the movement of both molecules against their concentration gradient.

Proton Pump: By creating a low concentration of protons inside the cell, the natural diffusion of hydrogen into the cell creates energy that can be used to do other transport tasks.

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Protons are pumped out with the use of ATP. Outside of cell has has high proton concentration, inside has low concentration. The natural diffusion of protons back into the cell, also facilitates the diffusion of other molecules, in

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