DNA: Structure

DNA: Structure

Please draw and name the biomolecules below:

1. 2.

3.

Happy Tuesday!Bell Work: October 8

Science Fact of the Day:

The tongue of a blue whale is

bigger than a taxi cab, and can

weigh as much as an elephant.

CO: I will identify the components of DNA and understand its function.

LO: I will write notes and practice vocabulary.

So far you’ve learned about…

• Carbohydrates quick energy, 1:2:1, CHO

• Lipids

• Proteins,

Today you’re going to learn about…• Nucleic Acids---the fourth kind of biomolecule

Long term energy, cell membranes, fatty acids, CHO

amino acids, many different shapes, enzymes, CHON

A lesson from Jurassic Park...

The nucleic acids we’ll talk about in biology are DNA and RNA

Deoxyribonucleic acid = DNA

DNA is the biomolecule used to pass on genetic information to the next generation.

So…your DNA is half mom, half dad!

The monomer of DNA is called a nucleotide, which has:

1. 5-carbon sugar (deoxyribose)2. phosphate group3. nitrogenous base.

This means that the elements in a nucleic acid are: C, H, O, N, and P

There are 4 kinds of nitrogenous bases in DNA.Adenine (A), Guanine (G), Cytosine (C), & Thymine (T)

DNA base pairing rule: adenine and thymine pair together with hydrogen bonds cytosine and guanine pair together with hydrogen bonds

Hydrogen bond

Hydrogen bonds are weak (easily broken) bonds

The differently shaped bases are bonded together antiparallel to one another (5’3’)

When enough bases are linked together, the DNA ladder will twist into a double helix shape

In a Eukaryotic organism the DNA double helix

will coil around histones (proteins) and eventually be packed together into

chromosomes.

DNA is found in the nucleus in Eukaryotic

cells.

In a prokaryotic organism, DNA is found in the cytoplasm.

Important to Remember:

All living things have DNA!

Scientists refer to this as a “common genetic

code”

The sequence of bases matters! The order

determines the organism.

Vocabulary 3 Practice

Vocabulary Quiz TOMORROW!