1. Where in the cell is DNA found?

In the nucleus

2. The DNA from one cell is about 3 feet long! How does a 3 foot long molecule fit into such a tiny space…..?

1. Remove the gelatin capsule from the envelope

2. Cut a piece of thread 10 m long (from front wall to 2nd lab table). This represents a single DNA molecule.

3. Try to put the “DNA” thread into the “nucleus” capsule.

2. The DNA from one cell is about 3 feet long! How does a 3 foot long molecule fit into such a tiny space…..?

Wrapping it, twisting it into tight bundles.

That’s what chromosomes are.

3. How are genes, chromosomes, and DNA related? Be sure to include a labeled diagram with your explanation.

• Chromosomes and genes are made of DNA.• Genes are sections

of DNA.

4. How many sets of chromosomes does every animal body cell have? Where do they come from?

•2•One set from each parent.

5. What are the four nucleotides that from the “rungs” of the DNA ladder? How do they hold the code for genetic information?

• A (adenine)• G (guanine)• C (cytosine)• T (thymine)

• The order of the nucleotides in the DNA molecule is the code for genetic information.

6. If a DNA strand has a base sequence of TGGACCATA, what would the base sequence be on the opposite strand? Draw a diagram to illustrate this.

T G G A C CA C C T G G

DNAA T AT A T

6. If a DNA strand has a base sequence of TGGACCATA, what would the base sequence be on the opposite strand? Draw a diagram to illustrate this.

T G G A C CA C C T G G

A C C U G G

DNA

mRNA

A T AT A T

U A U

Protein Synthesis

TGCGGAG

Protein shape makes a difference

Questions?

Video: DNA and Protein Synthesis

http://www.youtube.com/watch?v=nHM4UUVHPQM

http://ed.ted.com/lessons/the-twisting-tale-of-dna-judith-hauck

7. What would the base sequence be on a strand of mRNA made from the ATTGCCCA base sequence?

A T T G C C C A

U A A C G G G U

T A A C G G G T