TODAY'S OBECTIVES

Student can...

• Student can draw and label parts of a phospholipid bilayer (cell membrane)
• Student can determine SA/V ratio for a cell and explain the significance of this number
• Student can recall vocabulary from 7.3 in textbook and use the terms when answering questions about content in this chapter.

CLASS LESSON

1. Students hand in hard copy answers to question from textbook p 189, questions #1-6).
2. Students complete blue handout on phospholipid bilayer structure.
   1. In your diagram of cell membrane structure, make sure you include in your diagram all the structures that are described in textbook 7.3.
3. Students complete blue handout on SA/V ratio.
   1. Ability to move material across cell membranes is important to cells; that is how they stay alive!
      1. Cell get oxygen and glucose and amino acids into the cell this way
      2. Cells get carbon dioxide and water out of the cell this way
   2. Cells need for nutrients (and production of wastes) is related to their metabolism ... metabolism rate is related to the amount of organelles "doing their work" ... amount of organelles is related to the volume of a cell [as cells get bigger they produce more organelles]
   3. ...however, as cells increase in size their "need" for substrates is greater than their ability to import them since import is either: (1) passive diffusion (which depends of cell membrane to cross) or (2) movement by proteins (which also depends of proteins and cell membrane)
   4. The overall picture is of a SMALL cell which efficiently imports and substrate material leading to a LARGE cell which inefficiently imports substrate material.
4. [C block only] Each student should make a list of vocabulary terms:
   • from chapter 7.3 in textbook
   • in word processing Google Doc with filename <C_Vocab73_Socrates>
   • share with <reimerj@gsis.sc.kr> as a viewer (or collaborator)
   • put one word on each line
   • place words in alphabetical order ("cell wall" would be above "phospholipid" because C comes before P in the alphabet)
   • definitions are not required (at this time)
5. [B block only] Each student should:
   • complete  blue handout on phospholipid bilayer structure.  [In your diagram of cell membrane structure, make sure you include in your diagram all the structures that are described in textbook 7.3.]
   • Go to the vocabulary folder and either:
     1. alphabetize the terms in every list (put them in alphabetical order) -or-
     2. make one "mind map" for each vocab list (hand them all in together next class)

ASSIGNMENT