Handout

• Please pick up a copy of course outline, lecture# 1 handout and a blank card from the front

• On the card, write your name, student number, contact info (telephone number, e-mail address) and your expectations from the course

• Return the information card to me at the end of the lecture

CELL BIOLOGY 1 (BIOL 200) (2006S): COURSE OUTLINE

• INSTRUCTOR

Dr. Santokh Singh

Department of Botany

Bioscience Bldg.# 2528 (Second Floor)

Telephone: 604-822-3330,

E-mail: santokh@interchange.ubc.ca

OFFICE HOURS: during lecture breaks or by appointment

TUTORIAL COORDINATOR AND TAs

• TUTORIAL COORDINATOR

Jamie Pighin, Dept. Botany,

E-mail: jpighin2002@yahoo.ca

• TEACHING ASSISTANTS

Apurva Bhargava,

E-mail: apurv@interchange.ubc.ca Jacqueline Monaghan, E-mail: monagh9@interchange.ubc.ca

PRE-REQUISITE COURSES

• All of BIOL 112 and one of CHEM 123 or CHEM 113; or all of

• SCIE 1, or all of BIOL 121 and co-requisite of all of CHEM 203

TEXTBOOK

Essential Cell Biology

Eds. B. Alberts et al. Garland Publishing, 2nd Edition, 2004.

COURSE CONTENT

Nine Units:

1. Introduction of Cell Structure & Function 2. Informational Macromolecules3. Interphase nucleus4. Biological Information Flow (Transcription &

Translation)5. Structure & Function of Membranes6. Mitochondria & Chloroplasts7. Endomembranes8. Cytoskeleton9. Cell Cycle

TEACHING & LEARNING

• Lecture outlines; powerpoint slides; textbook; tutorials

• Course website URL: https://www.botany.ubc.ca/biol200/

COURSE EVALUATION

• Tutorials: 25%

• Mid-term examination: 25%

• Final Examination: 50%

EXAMINATION DATES

• Midterm Examination (in class):

June 29 (1 - 1:50 PM)

• Final Examination (in class):

July 7 (1 - 3:30 PM)

POLICIES

• A student must pass the lecture component to pass the course. The maximum grade obtainable by students failing the lecture portion of the course is 45%

• An individual student's marks for each of the three components, tutorial grade, midterm exam and final exam will be counted (No grades will be dropped)

• Both midterm and final exams may contain short answer, multiple choice, fill-in the blanks, definitions, experimental, and essay questions

• Final exam will be cumulative: All lecture and tutorial material may be covered

• If you miss the final exam you must contact the office of the Dean of Science as soon as possible

Objectives for BIOL 200

• Have a functional grasp of the structure and function of all major eukaryotic cell systems

• Understand how these systems interact in the execution of complex processes, i.e. secretion or cell division

• Know the basic experimental techniques employed in cell biology research

• Facilitate the integration of concepts and data from many subsequent courses e.g. biochemistry, genetics and physiology

Course approach

• Presentation of material with emphasis on basic points

• Provision of specific details on tricky points

• Discussion of key concepts and their experimental basis

• Discussion of specific types of exam questions

BIOL 200 (Section 921)Lecture # 1; June 19, 2006

• Reading: Essential Cell Biology (ECB) 2nd edition. Chap 1 and Chap 2, Chap 5, pages 169-177Background Study Material: Study Panels 2-1, 2-2, 2-3, 2-4, 2-5, 2-6, 2-7 (pages 66-79).

• Good questions: 1-6, 1-7, 1-9, 1-10, 1-12, 1-18• Assignments: 1.Make a diagram relating the relative size of a typical

nucleus, mitochondrion, a bacterium and a ribosome. 2. Practice to identify the cell organelles in electron micrographs of a variety of cell types using the Image Database website: http://www.biomedia.cellbiology.ubc.ca/

• Learning Objectives1. Be able to critically define cells and organelles 2. Know the major classes of eukaryotic cell organelles and their functions. 3. Develop a general feel for the flow of information and the flow of material in

cells. 4. Know the different types of microscopy and their functions5. Know the mechanism and key reactions of synthesis of macromolecules 6. Know the different forces that stabilize the DNA structure

Concepts of organisms and cells

• Organisms are made of cells.e.g. a bacterium, a butterfly, a rose, and a dolphin

• Cells are the basic unit of life with a fundamentally similar chemistry. They are small, membrane-bound and arise from preexisting cells.e.g. a nerve cell, Paramecium (protozoan), plant stem cells, a bacterium, a human white blood cell

Diversity of cells: amazingly different shapes and functions

Unity of cells

• Living cells have a similar basic chemistry and information flow

• Cells have evolved from same ancestors

• Cells from different species share similar genes (e.g. defects in the gene “Kit” result in white patches on foreheads of both the human baby and the mouse.

Scale of things: how big/small is a cell and its parts

Light microscopy

• Light microscopy involves visible light and glass lenses to form an image of the specimen.

• Advantages: Live cells can be viewed. Images show color if specimens are stained with dyes. Disadvantages: Limit of resolution is 0.2 um.

Specialized types of light microscopy

• Phase contrast and differential interference contrast microscopy – enhance and amplify variations in refractive index within specimen.

• Fluorescence microscopy - uses fluorescent dyes and antibodies to bind to and detect certain proteins or other molecules. These fluorescent molecules absorb ultraviolet light and emit light of a lower wavelength. Fluorescently labeled cells glow bright against a dark background.

• Confocal scanning light microscopy (CCLM) -type of fluorescent microscope: uses a laser beam to excite the fluorochrome in a thin slice called a Z-section or optical section. The light emitted by the fluorochrome is focussed on a site, i.e. "confocal", with a pinhole aperture that removes out of focus fluorescence. Allows many slices of a structure to be gathered as digital image files and then 3-D reconstructions made on the computer.

Different types of light microscopy

Transmission electron microscopy

• Transmission electron microscopy (TEM) is highly analogous to light microscope. Beam of electrons go through thin layer of sample and are either diffracted by interacting with sample or go straight through (transmitted).Resolution of the electron microscope about 0.2 nm Pros: good resolution of size range important to cells (200 nm to 0.2 nm; size from organelles to macromolecules).Cons: samples must be able to withstand electron bombardment and vacuum, so elaborate sample preparation is necessary (fixation, resin embedding, sectioning into slices 50-100 nm, heavy metal stain). Hard to reconstruct 3-D structure from 2-D slices.

Fig. 1-8: TEM of a thin section of a liver cell

Scanning electron microscopy

• Scanning electron microscopy (SEM)-beam of electrons is scanned across a sample and as it hits the sample, secondary electrons are ejected. These are collected by a secondary electron detector which electronically builds an image based on the electron intensity (from white to black). Pros: great for surfaces, 3-D imagesCons: electrons require vacuum so most samples have to be fixed and dried.

From: Becker et al. World of the Cell

What is the structure and function of this organelle?

What is the structure and function of this organelle?

What is the structure and function of this organelle?

What is the structure and function of this organelle?

What is the structure and function of this organelle?

What is the structure and function of this organelle?

Chemical composition of a bacterial cell

Characteristics of macromolecules in cells• Macromolecules are polymers

consisting of (usually) bifunctional monomers joined by a condensation reaction.

• Macromolecules typically have an overall molecular polarity. They join by a condensation reaction that joins the 'head' of one monomer to the 'tail' of the next.

• The sequence of monomers can be determined by either informational or non- informational systems. Both are dependent on enzymes.

• Nucleic acids and Proteins are an example of informational macromolecules

• Polysaccharides and Fats/Lipids are examples of non-informational macromolecules

Macromolecules in cells

Macromolecules and their monomeric subunits

Sugars are subunits of Polysaccharides

Fatty acids as subunits of lipids

Palmitic acid

Phospholipid inCell membrane

Triglycerol

Amino acids are the subunits of proteins

Nucleotides are the subunits of DNA and RNA

The structural hierarchy in the molecular organization of cells (Lehninger Principles of Biochemistry Fig. 3.26)

Fig. 5-3, p. 173What is happening in this experiment regarding DNA’s characteristics?

Fig. 5-4: DNA is genetic material.

Important

macromolecule

panel!

panel 2-6,

page 76

Fig. 5-6: Complementary base pairing

A=T

G C

Fig. 5-2: DNA structure

Base pairing holds together the two two strands of the DNA double helix

Fig. 5-7, p. 175

DNA is synthesized in a 5’ to 3’ direction

[Fig. 6-10 (p. 202)]

Watson +Crick (1962 Nobel prize) DNA model features:

• DNA is composed of 2 chains forming a right-handed helix.• The chains run antiparallel to one another (5' to 3' vs. 3' to

5')• Sugar phosphate backbone (negatively charged) is

hydrophilic, facing solution• Bases projecting towards the center stacked one on top of

the other, form a hydrophobic core• Rules of base pairing: A pairs with T (or U in RNA); G pairs

with C (Fig 5-6 p. 175)• Purine always hydrogen bonds with pyrimidine

(purines=A+G; pyrimidines=T(U)+C)• Number of hydrogen bonds varies:-The A::T bond has two hydrogen bonds-The C:::G bond has three hydrogen bonds