1 / 17

Ch. 10 Nucleic Acids & Protein Synthesis

Ch. 10 Nucleic Acids & Protein Synthesis. What controls the production of proteins in cells? DNA Every time new cells develop by mitosis, DNA is passed onto that new cell by the parent cell. DNA has 2 main functions 1. Store and use information to direct cell activities.

isaac-jefferson
Download Presentation

Ch. 10 Nucleic Acids & Protein Synthesis

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Ch. 10 Nucleic Acids & Protein Synthesis • What controls the production of proteins in cells? • DNA • Every time new cells develop by mitosis, DNA is passed onto that new cell by the parent cell. • DNA has 2 main functions • 1. Store and use information to direct cell activities. • 2. Copy itself for new cells that are created.

  2. DNA makes this? • Proteins, which are made of amino acids. • How many amino acids are known? • 20 • Where is DNA found in your cell? • Nucleus – inside chromosomes • Chromosomes  DNA  Traits  Genes

  3. DNA • Who were the 1st people to propose a model of DNA? They won a noble prize. • Watson, Crick, Wilkins, & Franklin • This is the term for describing a DNA molecule. • Double helix (spiral stair-case) • DNA has two long strands; each strand is constructed of a series of nucleotides.

  4. DNA Model • DNA Nucleotide (3 parts to a nucleotide) • 1. Deoxyribose sugar • 2. Phosphate • 3. Nitrogen base (4 different types • Types of nitrogen bases 1. Adenine 2. Guanine 3. Thymine 4. Cytosine

  5. Nitrogen Bases • Adenine always pairs with Thymine • Equal amounts • Guanine always pairs with Cytosine • Equal amounts (Pg. 311) • Draw a DNA Molecule • Pg. 186 • A DNA molecule looks like a twisted ladder.

  6. When a DNA molecule makes an exact copy of itself this is called replication. • This occurs when mitosis takes place. • During replication the DNA molecule splits in half where the nitrogen bases are attached by a hydrogen bond. • Now there are 2 unattached strains of DNA. These strands will pair up with a “new” strand that matches the “original” strand. • These strands reattach with the help of an enzyme called DNA polymerase.

  7. The original DNA gets the new strand from RNA. • RNA is like DNA, except it has 1 strand of nucleotides; DNA has 2 strands of nucleotides. • RNA has ribose as its sugar. • RNA also has uracil instead of thymine as its base. Uracil pairs up with adenine.

  8. Organism differ from each other by the pattern of the base sequence in their DNA. • Mitosis is responsible for the formation of genetically identical cells. • Genetic material in organisms include  DNA, RNA, & proteins. • The m-RNA (messenger RNA) carries a copy of DNA out of the nucleus into the cytoplasm of the cell. This is called transcription. DNA into m-RNA • The m-RNA carries the information for making a protein chain to the ribosomes, where proteins are synthesized.

  9. The m-RNA is synthesized in the ribosomes to make a complementary copy of the DNA code for a protein chain. • The process of making a matching sequence of bases for the m-RNA is called translation. Pg. 195. • t-RNA (transfer RNA) brings amino acids to the ribosomes so the proteins can be made for the matching sequence involved in translation. • The r-RNA (ribosomal RNA) helps to produce enzymes needed to bond amino acids together during protein synthesis.

  10. RNA • RNA is produced from DNA. • 3 types of RNA • 1. Messenger RNA (m-RNA) • An uncoiled strand. • 2. Transfer RNA (t-RNA) • A folded strand (like a hairpin) • 3. Ribosomal RNA (r-RNA) • A globular form of RNA

  11. Difference of RNA & DNA • 1. Ribose as sugar. • DNA has deoxyribose. • 2. Uracil pairs with adenine. • DNA has thymine pairing with adenine. • 3. RNA is a single strand of nucleotides. • DNA is a double strand of nucleotides.

  12. Codon • A codon is a sequence of three nitrogen bases in the m-RNA molecule. • This is produced during transcription. • Each specific codon code is a code for a specific amino acid. • 3 bases are used in the codon sequence. • AUG is always the “initiator” codon. • UAA or UAG are always the “terminator” codon.

  13. Anticodon • An anticodon is a three base sequence that pairs with the codon sequence. • Anticodons are produced by t-RNA • This is produced during translation. • AUG CUU ACG CAU GUA UAU = Codon (transcription) • UAC GAA UGC GUA CAU AUU =Anticodon (translation) • AUG UCA CUA GCU UCG UAG = Codon (transcription) • UAC AGU GAU CGA AGC AUC =Anticodon (translation)

  14. The molecular structure of DNA is a universal code that is represented in all organisms. All organisms use A,T,G,C for their DNA. • This is evidence that all organisms alive today share a common ancestor billions of years ago.

More Related