Chapter 3- Section 4 The DNA Connection



Chapter 3- Section 4 The DNA Connection/Protein Synthesis

AGENDA- Mon. April 19, 2004

STUDENTS

1. Warm up 15 min

2. Dog Genes 15 min

3. The DNA Connection 20 min

PROJECT DUE APRIL 21st

HW Read pp. 92-93 in your own words explain How Cells Make Proteins.

(There will be a physical demonstration tomorrow where many of you will be asked to present your explanation. Do not mess this up, or you will take notes instead!)

CALIFORNIA STATE STANDARDS

1.0, 1.a, 1.c, 2.0, 2.b, 2.c, 2.d, 2.e, 7.0, 7.c, 7.d, 7.e

OBJECTIVES

• Explain the term genetic code

• Describe the process by which a cell produces proteins

• Describe different types of mutations and how they affect an organism.

TEACHER

1. Warm up

a. Do “DISCOVER” questions #1-2 on page 91

2. Dog Genes! Overhead (Review Meiosis and genetics)

3. The DNA Connection Lecture

a. OVERHEAD TRANSPARENCIES

AGENDA Tue. April 20, 2004

STUDENTS

1. Warm up 5 min

2. Protein Synthesis Questions 15 min

(Do we Take Notes Instead of Demonstration?)

3. Protein Synthesis Demonstration (or Notes) 25 min

4. Discuss Demonstration 5 min

PROJECTS DUE TOMORROW!!!

CALIFORNIA STATE STANDARDS

1.0, 1.a, 1.c, 2.0, 2.b, 2.c, 2.d, 2.e, 7.0, 7.c, 7.d, 7.e

OBJECTIVES

• Explain the term genetic code

• Describe the process by which a cell produces proteins

• Describe different types of mutations and how they affect an organism.

TEACHER

1. Warm up

a. Define the following words:

i. Messenger RNA

ii. Transfer RNA

2. Protein Synthesis questions:

Q: What contains protein? A: Ribosomes

Q: Where are ribosomes mainly found in the cell? A: cytoplasm

Q: Chromosomes are located where in the cell? A: the nucleus

Q: What is the role of RNA in the cell? A: It is the genetic messenger that carries the genetic code from the DNA inside the nucleus to the cytoplasm.

Q: Is RNA double stranded like DNA? A: No, it is single stranded

Q: What are the nitrogen bases for RNA? A: Adenine, Uracil, Cytosine,

Guanine

Q: Which nitrogen bases pair with which? A: A with U & C with G

Q: What is the role of messenger RNA?

A: It copies the coded messages from the DNA in the nucleus, and

Carries it to the cytoplasm.

Q: What is the role of transfer RNA?

A: It carries amino acids and adds them to the growing protein

Chain.

Q: When does the protein chain stop growing?

A: When it reaches a 3 letter Stop code.

3. Protein Synthesis Demonstration:

Draw a big circle on the floor- NUCLEUS

1- DNA (inside nucleus holding DNA model) floating around

• Suddenly DNA “unzips” (attach yarn to end of molecule)

1- Messenger RNA (inside nucleus) base pairs with DNA and copies the coded messages

• DNA and RNA hold two strings of different color yarn

• mRNA leaves the nucleus and enters the cytoplasm (still holding the RNA yarn only (Dumps the DNA strand)

6- Nitrogen Base codons (line up on the mRNA strand)

• 2- AAC

• 2- UUG

• 1- GCA

• 1- CGU

4- Ribosome floating around cytoplasm attaches to the mRNA at the first three nucleotides.

2- Transfer RNA

• 1- tRNA enters the ribsome with an amino acid and a codon and attaches to the first three nucteotides.

• 1- tRNA enters the ribosome with an amino acid and a codon and attaches to the next three codons.

• The first tRNA gives the second tRNA its amino acid and it leaves the ribosome as the ribosome moves down to the next three nucleotides.

o The first tRNA comes back with another amino acid and codon and attaches to the mRNA strand.

o The second tRNA gives the first one his amino acid chain and leaves the ribosome as the ribosome moves down the chain.

2- Amino Acids – join hands with the tRNA

Protein Synthesis- the production of protein

Protein is found inside the ribosomes, which are located in the cytoplasm on the cell.

Chromosomes are located in the nucleus of the cell.

So how do ribosomes and chromosomes come together to produce proteins if they are located in different parts of the cell?

RNA is a genetic messenger that carries the genetic code from the DNA inside the nucleus to the cytoplasm.

• Unlike DNA, RNA is only single stranded.

• Like DNA, RNA also has four nitrogen bases. However, instead of the base Thymine, RNA has a base called Uracil.

• For RNA the nitrogen bases join as followed:

▪ Adenine joins with Uracil

▪ Cytosine joins with Guanine

This is how Protein Synthesis occurs:

The DNA molecule “unzips” and the messenger RNA strand (which is responsible for copying the coded messages from the DNA in the nucleus and carrying them to the cytoplasm.) base pairs with the DNA strand and copies the coded messages.

Once in the cytoplasm, messenger RNA attaches to a ribosome and translation begins. The ribosome reads the three letter code and allows a transfer RNA to enter into the ribosome.

The transfer RNA carries an amino acid into the ribosome to match up the three letter code and form a protein chain. The ribosome moves down the messenger RNA reading new codes and allowing new amino acids to form the protein chain.

Once the ribosome reads a three letter STOP code, it releases the protein chain and protein synthesis ends.

Title: The DNA Connection

The 4 nitrogen bases of DNA are:

which joins with

which joins with

The order of the nitrogen bases along a gene form a genetic code that specifies the type of protein to be produced.

• Amino Acids are the building blocks of proteins. There are amino acids.

3 nitrogen bases code for 1 amino acid

• The order of the bases determines which amino acid will be formed. For example, think of it as THREE letter words:

dogheryouhimcat

• These words ALL mean something different. If there was a mistake made in the sequence, the cell can produce proteins that should not appear or make any sense. These mistakes are called MUTATIONS. For example:

dogherrouhimcat (1 mutation)

or

dogherryouhimca(3 mutations)

The 4 nitrogen bases of DNA are:

which joins with

which joins with

The order of the nitrogen bases along a gene ( are the building blocks of proteins. There are amino acids.

nitrogen bases code for amino acid

• The order of the bases determines .

For example, think of it as THREE letter words:

dogheryouhimcat

• These words ALL mean something different. If there was a mistake made in the sequence, For example:

dogherrouhimcat (1 mutation would appear)

or

dogherryouhimca (3 mutations would appear)

AGENDA Wed. April 21, 2004 and Thurs. April 22, 2004

STUDENTS

1. TURN IN PROJECTS!!!!!!!!!!!!!!!!!!!!!

2. Warm up 5 min

3. Lab #5- Chromosome Structure 40 min

CALIFORNIA STATE STANDARDS

1.0, 1.a, 1.c, 2.0, 2.b, 2.c, 2.d, 2.e, 7.0, 7.c, 7.d, 7.e

OBJECTIVES

• Explain the term genetic code

• Describe the process by which a cell produces proteins

• Describe different types of mutations and how they affect an organism.

TEACHER

1. All project due today! (Wed April 21)

2. Warm up

3. Lab # 5- (12 points total)

• ½ class- Microslide viewers- draw, color, label, identify (8 points)

• ½ class- Workbook Chapter 3 section 4 (Workbooks due completed on Friday)

▪ Review and Reinforce worksheet (4 points)

AGENDA Fri. April 23, 2004

STUDENTS

1. Warm up 5 min

2. Test Review (4 extra points!) 45 min

CALIFORNIA STATE STANDARDS

1.0, 1.a, 1.c, 2.0, 2.b, 2.c, 2.d, 2.e, 7.0, 7.c, 7.d, 7.e

OBJECTIVES

• Explain the term genetic code

• Describe the process by which a cell produces proteins

• Describe different types of mutations and how they affect an organism.

AGENDA- Mon. April 24, 2004

STUDENTS

1. Test #3- Chapter 3- Genetics: The Science of Heredity

................
................

In order to avoid copyright disputes, this page is only a partial summary.

Google Online Preview   Download