Life Science Chapter 1 Part 2.

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Presentation transcript:

Life Science Chapter 1 Part 2

Chemical Compounds in Cells Electrons have a -1 electrical charge & a mass of 1/2000 AMU Cells are the basic building blocks of all living things…. Atoms & Molecules are the basic building blocks of cells & all other matter. Protons have a +1 electrical charge & a mass of 1 AMU Neutrons have a neutral electrical charge & a mass of 1 AMU Atoms are composed of 3 basic subatomic particles…. Protons and Neutrons are in the nucleus w/ electrons orbiting the nucleus.

Elements & Compounds Atoms bind together w/ 2 basic types of bonds: Element: Substance composed entirely of one type of ATOM. About 100 different atoms are known to exist. Compound: Two or more elements combined chemically in a definite proportion forming a Molecule. Atoms bind together w/ 2 basic types of bonds: Ionic – atom “steals” electrons (ie NaCl) - metal + nonmetal Covalent – atoms “share” electrons ie (C6H12O6) – 2 or more nonmetals

Chemical Formulas 6CO2 + 6H2O  C6H12O6 + 6O2 Subscripts Coefficients Yields Products Reactants C = 6 H = 12 O = 18 C = 6 H = 12 O = 18 Law of the Conservation of Mass requires that the same # of atoms found on the left side must also equal the same # of atoms on the right side.

Periodic Table Atomic Number – the total number of Protons in the nucleus Atomic Mass – The sum of protons & neutrons in an nucleus Isotope – types of an element w/ different #’s of neutrons in the nucleus. Mole – a type of unit used to measure atom numbers: 6.02 x 1023

Organic verses Inorganic Inorganic Compounds are those that do not contain carbon. (NaCl) Organic Compounds: Most compounds that contain CARBON are considered to be organic. Ie: CH4, C2H2, C6H12O6 Exceptions – these are inorganic not organic: CO2 (carbon dioxide gas) CO (carbon monoxide gas)

4 Types of Organic Molecules Carbohydrates: and energy rich made of simple sugars & contain: Carbon, Hydrogen & Oxygen Rice, pasta, starch, glucose & sugars Proteins: Large organic molecules made of amino acids & contain carbon, nitrogen, oxygen, hydrogen and sometimes sulfur. Enzymes, meat, eggs, fish, muscle Lipids: Energy rich organic molecule made up of fatty acids & gylcerides that contain carbon, hydrogen and oxygen. Contain more energy potential than carbohydrates. Fats, oils & waxes Nucleic Acids: Very Large organic molecules that are made up of nucleotides & contain: carbon, nitrogen, oxygen, hydrogen and phosphorus. DNA, rRNA, mRNA & tRNA

Passive & Active Transport Active transport: requires energy to be expended by the cell. Often moving substances from low concentration to high concentration. Often uses “Transport Proteins” which grab molecules outside the cell and pull them inside the cell: example insulin requires a transport protein to enter the cell. Passive Transport: movement of substances w/out added energy Diffusion: Movement of a substance from a higher concentration to that of a lower concentration. Osmosis: diffusion of water molecules from a high concentration to a lower concentration

Diffusion Movement of substance from an area of high concentration to low concentration.

Osmosis The water molecules move across the membrane to try an equalize the concentrations of water on both sides of the membrane.

Active Transport Moving substance from low [] to high [], requires the use of energy.