1 / 12

Cell theory…

Cell theory…. Cells come from other cells All things are made of cells Named by Robert Hooke when he observed cells in cork oak Monk’s cells in monastery. Hooke’s microscope – late 17 th century.  Eye piece. Light source . LT#1 Structure & Fxn of Plasma (cell) Membrane.

jillian-cleveland
Download Presentation

Cell theory…

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Cell theory… • Cells come from other cells • All things are made of cells • Named by Robert Hooke when he observed cells in cork oak • Monk’s cells in monastery

  2. Hooke’s microscope – late 17th century  Eye piece Light source 

  3. LT#1 Structure & Fxn of Plasma (cell) Membrane • The plasma membrane separates the inside of the cell from the outside • It is made up of phospholipids • Phospholipids are fats with a phosphate group attached • Fats alone are hydrophobic • The phosphate groups are hydrophilic

  4. Glycocalyx – glycoprotein / glycolipid / glycocarb = area adjoining the cell that provides specific bio markers that allow cells to recognize each other

  5. LT#1 The molecules involved with the Fluid Mosaic Model of the plasma membrane. • The fluid mosaic model is a double bilayer of lipids imbedded with dispersed proteins • The bilayer consists of: • Phospholipids: polar heads, nonpolar tails • Cholesterol: steroid • Glycolipids: lipids bound with carbohydrate

  6. LT#2 & #3 Structure & Fxn of Nucleus; Role of DNA • The nucleus consists of the nuclear envelope, nucleoli, chromatin, and proteins • It contains the genetic library w/blueprints for proteins (DNA) • It dictates the kinds and amounts of proteins to be made • We have 46 chromosomes: 23 from mom and 23 from dad

  7. LT#2 & #4 The role of ribosomes & 3 RNAs. • Fxn of nucleolus = site of ribosome prodxn • Transcription = synthesis of RNA under the direction of DNA • mRNA carries information from DNA to ribosomes • Ribosomes are made from proteins and rRNA, which come together to form • tRNA (a molecular machine ) that can read and translate the information they carry into proteins.

  8. LTs #4-#8 • See Chart

  9. LT#9 Describe transport across the plasma membrane. Passive transport; diffusion; random nature of diffusion; concentration gradient • Passive transport requires no E (ATP) • E.g. Diffusion of nonpolar & lipid soluble substances • Diffuse directly through the lipid bilayer • Diffuse through channel proteins • Random because it can go either way • Concentration gradient – a difference in concentration between 2 points (cell membrane)

  10. LT#9 What is osmosis? Be sure you can differentiate between a hypertonic, hypotonic and isotonic situation! Essay! • Osmosis is the diffusion o f water across a semipermeable membrane • Hypertonic – solutions with [solute] > cytosol • Hypotonic – solutions with [solute] < cytosol • Isotonic – solutions with same [solute] as cytosol

  11. LT#9 If you add distilled water to blood, what will happen to red blood cells relative to the 3 states? • If you add distilled water to blood the RBC would burst because RBC contain 0.7% salt so distilled water is a hypertonic solution (to the cell) and water diffuses into the cell  POP! (lyse)

  12. LT#9 What is the difference between active and passive transport? • Active transport requires ATP • Passive transport does not require E (ATP)

More Related