CELL ORGANELLES

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CELL ORGANELLES

• Review for Lecture P052

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TEST TAKE-HOME QUESTION

• Use the summary form to summarize the pulse-chase
  experiment of endomembrane function as described
  on textbook pp. 97b-99a and/or CD Activity 5.2
• 18 -36 points
• take-home section must be turned in with the test
  or emailed before the test.
• Honor Code

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Experiment summaries

• Logical consistency
• hypothesis cause
• experiment measure
• results of measurements
• conclusion logical consistency

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BASIC BIOCHEMISTRY

• Quiz 4. You MUST know these categories
• for Test 1.
• For understanding membranes and other cell parts
• for understanding genetics coming after test 1
• For reading newspapers
• for making personal decisions for health wealth

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LAB this week

• Easy, learning skills for next experiment
• Turn in special chart (download LAB 3)
• Use lab resources to prepare for Test 1
• flash cards
• ask assistants and professor questions
• use lab computers to review

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TEST PREPARATION http//campus.queens.edu/faculty
/jannr/bio103/tests/test1.htm

• Sign up for tutoring in the Learning Center in
  McEwen Building. 6-8 today. Fri?
• get together with a group of study-buddies. You
  can study in the lab 24-7 if you have a permit
  ask for one during your lab session.
• Plan ahead avoid the traditional but ineffective
  all-nighter you need to be able to think clearly
  to do well on science tests.

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Fluid mosaic hypothesis

• Fluid lipid bilayer.
• Mosaic protein floating in the bilayer
• vs older sandwich models outer layers of
  protein (rejected)
• you cant see a membrane (its too small you
  only see a border with a light microscope)
• circumstantial evidence from electron microscopes

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• Which hypothesis do these data support?
• Fluid mosaic
• OR
• Sandwich

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most important concept All cells have

• chromosomes,
• ribosomes,
• some type of energy-conversion system,
• and phospholipid membranes with protein channels
  and enzymes.

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Prokaryotes

• http//campus.queens.edu/faculty/jannr/cells/cellt
  ables.doc

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PROKARYOTES

• Oldest
• smallest
• membraneoutside
• wall alsousually
• but no...

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Cell types
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Eukaryotes

• Animals, including protozoa
• Plants
• Most algae and seaweeds
• fungi
• ALL with membrane-bound organelles

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Animal cells have no walls

• http//www.med.uiuc.edu/histo/small/atlas/image/te
  m17/14375a1.htm

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Cell membrane face (left) and cell wall (right)
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most important concept All cells have

• chromosomes,
• ribosomes,
• some type of energy-conversion system,
• and phospholipid membranes with protein channels
  and enzymes.

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Eukaryotes do some things within membrane-bound
organelles
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Energy is used for motion and synthesis
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In prokaryotes ATP is produced in the cytoplasm
and along the cell membrane

• In Eukaryotes most ATP is produced in
• mitochondria (both plants and animals)
• chloroplasts (plants only)
• (mitochondria, chloroplasts, and nuclei have two
  phospholipid bilayers)

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SIZE IS IMPORTANTin identifying cell parts

• 10-4 typical eukaryotic cell, plant vacuole
• 10-5 nucleus, chloroplast,
• 10-6 mitochondrion, large vesicles,
  typical prokaryotes
• ------- LIGHT WAVES-------------
• 10-7 crista inside mitochondrion, ER, flagellum
• 10-8 membrane, ribosome, microtubule

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USING THE SCIENTIFIC METHOD TO EXPLAIN NUCLEAR
TRANSPORT. CD 5.1 and textbook
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• http//www.sciencemag.org/cgi/content/full/301/56
  38/1380/FIG3

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• http//www.sciencemag.org/cgi/content/full/301/56
  38/1380/FIG3

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USING THE SCIENTIFIC METHOD TO DISCOVER THE
FUNCTIONS OF THE ENDOMEMBRANE SYSTEM. CD 5.2 and
textbook. And the signal hypothesis

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Eukaryotes do some things within membrane-bound
organelles
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Cnxns to chem
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http//campus.queens.edu/faculty/jannr/cells/cellt
ables.doc
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THE MAIN CELL TOOLS
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most important concept All cells have

• chromosomes,
• ribosomes,
• some type of energy-conversion system,
• and phospholipid membranes with protein channels
  and enzymes.

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Chapter 5