Characteristics of Life
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1 DNA
2 Characteristics of Life Cellular organization Reproduction Homeostasis Heredity Responsiveness Growth and Development Complex Chemistry (Biomolecules)
3 Biomolecules Biomolecule Proteins Carbohydrat es Lipids Nucleic Acids Element C, H, O, N, S C, H, O C, H, O, P C, H, O, P, N Examples Enzymes, muscle fibers, antibodies Sugar, glucose, starch, glycogen, cellulose Fats, oils, waxes, steroids, phospholipids in membranes DNA, RNA Monomers (subunits) Animo Acids Monosacchar aides (simple sugars Fatty Acid Nucleotides
4 DNA Double Helix February 28, 1953 Watson and Crick created a model of DNA by using Franklin s and Wilkins s DNA diffraction X-ray
5 Nucleotides: building blocks of DNA (and RNA) A DNA nucleotide a 5-carbon deoxyribose sugar a phosphate group one of four nitrogenous bases: adenine (A), guanine (G), cytosine (C), or thymine (T).
6 DNA is in a Double-Helix Structure This structure provides Protection and takes up minimal space in the Nucleus
7 List the Parts of a Nucleotide
8 Complementary Base Pair Rules A T T A G C C G
9 Practice Strand A Strand B? (compliment) ATGCTAGCTATTC TACGATCGATAAG
10 DNA Functions DNA contains all the information for developing all proteins in the body. Primary function is to create proteins Proteins make up the structures and carry out the functions of the organism. DNA is located in the nucleus of all cells.
11 Genes DNA is segmented into parts called genes. Genes are responsible for coding different traits (skin, eye, hair color)
12 DNA in the Nucleus DNA is found in the nucleus and is too big to leave the nucleus. DNA s main function is to create Proteins. Proteins are made outside of the nucleus on organelles called Ribosomes.
13 How does the information to make the RNA proteins get to the ribosomes? DNA makes RNA inside of the nucleus through the process of Transcription.
14 DNA or RNA DNA Double Stranded CGAT Deoxyribose Sugar Too big to move from nucleus RNA Single Stranded CGAU Ribose Sugar Small and Transferable 3 types (mrna, trna, rrna)
15 Types of RNA Types of RNA Cells have three major types of RNA: messenger RNA (mrna) ribosomal RNA (rrna) transfer RNA (trna)
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17 ESSENTIAL FOR LIFE!!!! Proteins are used to create all the different types of organelles, cells, organs as well as perform their functions RNA to Protein RNA takes the information from DNA to the ribosome to build proteins by coding for amino acids. The building of proteins is called translation.
18 MAJOR TYPES OF PROTEINS Structural Proteins Storage Proteins Contractile Proteins Transport Proteins Enzymes Figure 3.15
19 What if something goes WRONG!!! The proper function of many proteins is essential for the function of a cell. Genes (DNA) affects the protein functions, which in turn affects all bodily functions Mutation an error (change) in the DNA sequence. Can have major, little, or no affect A mutation that alters the way a protein is made could change the function of a whole organ system.
20 Mutation in a DNA Sequence
21 In Review: Flow of Genetic Information The flow of genetic information can be symbolized as DNAàRNAàProtein. The sequence of nucleotides in DNA contain information. This information is put to work through the production of proteins. Proteins fold into complex, 3-D shapes to become key cell structures and regulators of cell functions.
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23 What s the difference between the DNA in your skin cells and the DNA in your muscle cells? NOTHING! Your DNA is the same all of your somatic (body) cells. How does this DNA get to every cell?
24 DNA Replication Each new DNA molecule is made of one strand of nucleotides from the original DNA molecule and one new strand.
25 New DNA molecule Free Nucleotides Original DNA Strand New DNA Strand Original DNA Strand New DNA molecule
26 Mitosis process by which DNA is copied in a cell before a cell divides in Mitosis Mitosis is the process in which cells divide with the same genetic material The original (parent cell) splits into two genetically identical daughter cells.
27 Mitosis
28 Mitosis (cont.) Mitosis is important for sexual and asexual organisms. Sexual Growth Repairing Tissues Cellular Differentiation Asexual How the organism reproduces
29 Asexual Reproduction (Budding)
30 Cellular Differentiation Just because all of your cells contain the same DNA does not mean all of your cells are the same. Differences between different cell types (bone,muscle,skin) are due to gene expression. This is not an result of different genes(dna) THIS IS NOT A RESULT OF MUTATION!
31 Cellular Differentiation
32 Gene Expression Transcription + Translation = Gene Expression The proteins that are produced determine what is express (shown) in an organism. Not all DNA is used(expressed) in every cell You express different genes at different stages of development. Zygote, Embryo, Baby, Adolescence, Adult Egg, larva, pupae, Chrysalis, Butterfly Egg, Tadpole, Froglet, Frog
33
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