1. Create a simile for DNA.2. Who were the three scientists

involved with the discovery of the structure of DNA?

3. What is the technique utilized to uncover the structure of DNA?

4. Why is DNA stored in the nucleus?

4/10 Daily Catalyst Pg. 48 DNA Structure

Quiz #11 on Friday Intro to DNA

Unit 4 Extra Credit due Monday, April 13thFind an article on genetics or genetic disease and write a half page summary/opinion on the article. Print out the article and staple your half sheet to the article. Quiz #12 next Friday DNA test 4/21

4/10 Class Business Pg. 48 DNA Structure

Daily Catalyst Class Business Objective DNA structure notes Quiz #11 DNA

4/10 Agenda Pg. 48 DNA Structure

We will be able to construct scientific explanations that use the structures and

mechanisms of DNA and RNA to support the claim that DNA and, in some cases, that RNA

are the sources of heritable information.

4/10 Objective

Who discovered the structure of DNA? What is the structure of DNA?

How does the structure of DNA relate to its function?

How does the structure of DNA allow DNA to be the source of heritable information?

Essential Questions:

DNA video clip

http://www.wired.co.uk/news/archive/2013-03/17/dna-explainer

**Pay close attention to the description of DNA’s structure**

Key Point #1: Vocabulary

Monomer One part

Polymer Many parts

What are all the parts that make up this?

Nucleotide

Key Point #2: A nucleotide is one part (monomer)

Multiple nucleotides make up DNA

Nucleotides

Key Point #3:

1 Sugar 1 Base1 Phosphate

Deoxyribose What does that mean? De:

Without Oxy:

Oxygen

The sugar:

Plain and simple Phosphate group

The phosphate

Every nucleotide has 1 base, but there are 4 to choose from:4 nitrogenous basesA,T,C, & G

The bases

Phosphate

Sugar

Bases

Key Point #4:The backbone is made up of _________ and ___________.

Phosphodiester bonds hold the backbone together.Strong, covalent bond

SUGAR

PHOSPHATE

The middle of the ladder are the bases. The bases are held together by _________ bonds.

Key Point #5:

HYDROGEN

The two sides of the “ladder” are held together by the hydrogen bonds between the bases.

The bases are sooo picky and will only pair up with a certain base.

Key Point #6: Complementary Base Pairing:A-- T

C-- G

Complementary Base Pairing

In 1953 Watson, Crick, and Franklin discovered DNA had the shape of a double helix.

The DNA is a double helix Double: two strands Helix: twisted.

Examples?

Structure

How does DNA get its twisted shape? KP #7: The hydrogen bonds between the bases

pull so tightly on one another that it causes the DNA to twist!

Key Point #7:

Complementary Base Pairing:A—TC—G

Do not forget!

What are the 4 kinds of bases found in DNA? Thymine (T) Cytosine (C) Adenine (A) Guanine (G)

Describe Watson and Crick’s model of DNA. A double helix

Tell me what ya know!

If a DNA strand has 34 Guanine bases, how many Cytosine's are there? WHY? 34, because all 34 Guanine’s need to pair up

with 34 Cytosine’s

What is the purpose of DNA? To hold our genetic information

Tell me what ya know!

If you have the bases TATGA, what are the correct DNA base pairs? T A T G A A T A C T

G A C C T A G C T G G A T C

Tell me what ya know!

Directions: On page 49 DNA model, create a DNA strand from the pieces given to you. Glue the model to page 49. Color the sugars- red Color the phosphates- green Color the thymine- yellow Color the adenine- blue Color the guanine- purple Color the cytosine- orange

DNA Model

Directions: Silently and independently complete the quiz. Turn your quiz into the basket when you are finished. Time: 10 minutesNoise: 0 (SILENT)

Quiz #11

Directions: Fill in the chart about RNA and DNA on notebook page 50 RNA.

4/10 Homework

Location Function Structure

Bases Sugar groups

DNA

RNA