Unit 5: DNA, RNA and Protein Synthesis

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Presentation transcript:

Unit 5: DNA, RNA and Protein Synthesis Lesson One: Structure

Introduction: Nucleic acids are organic molecules that serve as the blueprint for proteins and, through the action of proteins, for all cellular activity

Two Types of Nucleic acids. Deoxyribonucleic acid (DNA) Ribonucleic acid (RNA)

Nucleotides Both DNA and RNA are composed of small units called nucleotides. The nucleotides that compose nucleic acids have three parts:

Nucleotides Cytosine (C) Guanine (G) Adenine (A) 1. A nitrogenous base Cytosine (C) Guanine (G) Adenine (A) Thymine (T) (DNA only) Uracil (U) (RNA only) 2. simple (pentose) sugar Deoxyribose (DNA only) Ribose (RNA only) 3. A phosphate group

DNA structure (Double Helix) DNA consists of two single chains which spiral around an imaginary axis to form a double helix with nitrogenous bases from each strand of DNA chemically bonded through the axis of the helix. When the nitrogenous bases of two strands of DNA chemically bond through the center of the helix, each base can bond to only one type of base.

DNA structure (Double Helix) Bases that bond are called complementary bases. Guanine (G) will only bond with Cytosine (C). Thymine (T) will only bond with Adenine (A). *Bases are connected by hydrogen bonds

DNA structure (Double Helix)

DNA structure (Double Helix)

RNA Structure RNA consists of a single chain of nucleotides with nitrogenous bases exposed along the side. When the nitrogenous bases of RNA chemically bond to a strand of DNA, each RNA base can bond with only one type of DNA base. Bases that bond are called complementary bases. Guanine (G) will only bond with Cytosine (C). Uracil (U) will only bond with Adenine (A). Bases connected by Hydrogen Bonds

RNA Structure

Comparison of DNA and RNA: Components DNA RNA Type of base composing nucleotides Cytosine (C) Adenine (A) Guanine (G) Thymine(T) Cytosine(C) Uracil (U) Type of sugar composing nucleotides deoxyribose ribose Molecule structure and shape Double helix Single chain