2Molecules and Compounds A molecule is formed when two or more atoms combine.If atoms of different elements combine, the resulting structure can also be called a compound. Examples: Baking soda, sugarMolecular formula represents the numbers and types of atoms in a molecule. Examples… H2O & C6H12O6Structural formulas show what molecules look like.
42.3 Chemical Constituents of Cells 2 types of chemicalsOrganic must contain carbon and hydrogen but may contain other elements as well. (C6H12O6) Living things or once living things.Inorganic all the other compounds (H20) do NOT contain C.
6WaterIn the human body, water plays an important role in dissolving solid substances, moving chemicals around the body, and absorbing and moving heatIs the most abundant compound in cells and is a solvent in which chemical reactions occur.Transports chemicals and heat.
7Oxygen Releases energy from glucose and other nutrients. This energy drives metabolism.
8Carbon DioxideIs an inorganic substances that is a metabolic waste product, exhaled from the lungs.
9SaltsProvide a variety of ions that metabolic processes require.
11Carbohydrates Supply most of the energy needed by cells Composed of what 3 elements? C,H,OMonosaccharides (simple sugars)Disaccharides are two sugars joined togetherPolysaccharides, such as starch, are built of many sugars.Humans synthesize the complex carbohydrate called glycogen.
12Lipids Lipids made of C,H,O but in different amounts Lipids include fats (most common), steroids, and phospholipids.A fat that has all of its carbon atoms joined by single carbon to carbon bonds is said to be saturated. (solid at room temp, bad for you)Unsaturated fats (liquid at room temp, good for you, double bonds)Cholesterol, estrogens, and testosterone are all steroids.A phospholipid typically has two fatty acid chains and a phosphate group.
13ProteinsProteins have a great variety of functions in the body---as structural materials, as energy sources, as certain hormones, as receptors on cell membranes, as antibodies, and as enzymes to catalyze metabolic reactions.Proteins contain what 4 elements? C,H,O,N Sometimes SBuilding blocks of proteins are the amino acids (20)Proteins have complex shapes held together by hydrogen bonds. (their many shapes changes their functions)Protein shapes, which determine how proteins function, can be altered by pH, temperature, radiation, or chemicals. H bonds break this is called denatured.
14Amino Acids Alanine Glutamic acid Leucine Serine Arginine Glutamine You do NOT need in your notesAmino AcidsAlanine Glutamic acid Leucine Serine Arginine Glutamine Lysine Threonine Asparagine Glycine Methionine12. Tryptophan 13. Aspartic acid 14. Histidine 15. Phenylalanine 16. Tyrosine 17. Cysteine 18. Isoleucine 19. Proline 20. Valine(NOTE: the 8 essential amino acids are in red. These cannot be synthesized by the human body and must be obtained from food. Arginine and histidine are essential only for children.)
15Nucleic AcidsNucleic acids form genes and take part in protein synthesis.They contain the elements C,H,O,N,PThe building blocks are called nucleotides.Nucleic acids are of two major types: DNA (with deoxyribose) and RNA (with ribose).
16DNA & RNADeoxyribonucleic acid: DNA (deoxyribonucleic acid) stores the molecular code in genes.How many strands does it have? 2Deoxy means without OxygenRibonucleic acid: RNA (ribonucleic acid) functions in protein synthesis.How many strands does it have? 1
17Clinical ConnectionPrion protein can assume up to 12 different shapes before prion was discovered it was believed protein shape was always 3-DSome prions are infectious “mad cow disease”Some prions are not infectious “Alzheimer disease” which cause gummy plaques in the brain and disrupt functioning.Some forms of Alzheimer disease may be caused by protein misfolding