UNIT 7: DNA Structure & Replication Biology I DAYSHEET 79: Introduction to DNA Structure Name: __________________________ Date:_________________ Bellringer:

1. Get out your technology and go to www.Biomonsters.com

2. Click the “Biomonsters Cinema” link.

3. Click the “CHS Academic Biology Movies” link.

4. Watch the first video (Introduction to DNA Structure).

Get started on your Cornell notes right away!

Objective: I can identify the structure and makeup of a DNA molecule. Homework: Complete HW79

Activity 1: Cornell Notes

Biology Objective / Essential Question:

 

Main Ideas / Questions: 1. 2.

Notes: • DNA stands for ________________________________________

• ________________ and _____________ are credited with

discovering that DNA was a ______________________________

• However, _______________________________ took an important

x-ray photograph of DNA that showed that DNA was a double

helix.

Stop-and-Jot:

1. What is the picture below of? Who took this picture?

2. How was the discovery of the double helix an example of

collaboration between scientists? How was it NOT?

Activity 1 Continued: Cornell Notes

Main Ideas / Questions: 3.

Notes: • DNA is a _____________________________ so it is made of

_____________________________________

• Each nucleotide has 3 parts:

• There are four possible nitrogen bases in DNA:

o ______ = adenine

o ______ = thymine

o ______ = cytosine

o ______ = guanine

Stop-and-Jot:

1. In the space below, draw a nucleotide using simple shapes that

contains the nitrogen base adenine. Label the three parts of your

nucleotide. You can use the letter “A” to label the adenine.

2. Which part(s) of your adenine nucleotide would be the same in a

guanine nucleotide? Which part(s) would be different?

Activity 1 Continued: Cornell Notes

Main Ideas / Questions: 4.

Notes: • The ____________ from one nucleotide connects to the

________________ on another nucleotide forming the sugar-

phosphate backbone of DNA

• The 2 strands of DNA are held together by ___________________

___________ between the ____________ on either side.

Stop-and-Jot:

1. Label the DNA molecule below using the following terms:

Nucleotide Sugar Phosphate Backbone Nitrogen Bases Hydrogen Bond

Activity 1 Continued: Cornell Notes

Main Ideas / Questions: 5. 6.

Notes: • The base pair rule states the following:

o _____ will only bond with ______

o _____ will only bond with ______

• Mnemonic Device:

• This means that if you know what bases are on one strand (side) of

the DNA, you can predict what bases are on the

________________________ (opposite) strand.

Stop-and-Jot:

1. If one strand of DNA contains the nitrogen bases A T C G G A T,

what nitrogen bases are on the complementary strand?

2. A DNA molecule has 100 nucleotides. There are 30 adenine

nucleotides. How many of each of the following nucleotides are in the

DNA molecule?

Thymine _______ Guanine ________ Cytosine_____

• DNA stores our _____________________________ information.

• The sequence of ___________________, especially ___________

____________, in DNA is the code for how to make ___________,

and proteins determine our _______________________________.

   

Stop-and-Jot:

1. Why do some people have different eye colors?

Activity 2: Vocabulary Mastery Directions: Pick 6 terms from the notes that you are (a) have the most difficulty with or (b) believe to be the most important terms. Write them down in the chart below and then write the class definition (from your Cornell Notes). When you are done, call your teacher over to check your definitions and get a signature.

Vocabulary Term Class Definition 1.

2.

3.

4.

5.

6.

Homework 79: Mitosis & Meiosis Review Biology I

Name: __________________________ Date:_________________ Directions: Write if each of the following statements refer to Mitosis (MI) or Meiosis (ME) 1. This process is used to make more identical cells _____ 2. This process is used to make somatic (body) cells _____ 3. This process is used to make gametes (sex cells) _____ 4. If you scratch your knee or break your bone, you’ll use this process to replace the cells that die____ 5. This process only takes place in the ovaries or testes _____ 6. This process makes diploid cells that have two sets of DNA _____ 7. This process makes haploid cells that have only one set of DNA______ 8. This process makes cells that are genetically different ______

     

1. What does the picture to the left show? 2. Does this happen in mitosis or meiosis? 3. Why is this process important?

1. What does the picture to the left show? 2. Is this a karyotype of a male or female? 3. Is this individual genetically normal? How do you know?