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INC1 Module 9
Integrated Science
Term | Definition |
---|---|
Chemical reaction | one or more compounds formed; rearrangement of atoms. |
Reactants | substances about to react |
Products | newly formed substances |
law of conservation relative to chemical reactions | matter is neither created or destroyed in any chemical or physical change |
Concentration of reactants | involving liquid or gases; increase in rate or reaction |
Temperature | heat or electromagnetic radiation will make it go quicker; cold can slow it down or stop it |
Catalyst, addition of | substance increased the rate of chemical reaction by lowering its activation energy; can be a reactant, but then generates as a product |
Sunlight, addition of | changes the temp |
How do enzymes speed up chemical reactions in cells | act as catalyst; binds the reactants of a reaction & releases the products of the reaction; available for the same reaction again and again |
Photosynthesis | conversion of light energy from sun into chemical energy |
Respiration | energy transformation where potential chemical energy is the bonds of "food" molecules is release and partially captured in the bonds of ATP molecules; stored energy is released |
Organisms | made of cells; obtain and use energy; grow and develop; reproduce; respond to environment; adapt to environment |
Prokaryotic cell | before nucleus, single cell, pili, flagella, capsule, single circular chromosome, no organelles, cell wall |
Bacteria, Archeae | Prkaryotic cells |
Eukaryotic cells | true nucleus, organelles, single or multi cell, multiple linear chromosome, cell membrame e.g plants and animals |
Plants cells | rigid, non living cell wall, chloroplast (photosynthesis), one large vacuole, plastids, |
Animal cells | no cell walls, no plastid, cells more undefined |
Mitosis | 1 parent; 2 daughter cells; somatic (body) cells; identical diploids, same genetics of parent; form homologons chromosomes |
Meiosis | 4 non identical daughter cells; haploid; cross-over = genetic diversity; gametes (sex) cells, 2 division stages, 1 copy of every chromosome per cell |
Crossing over | homologous chromosomes line up in the equatorial plane and one chromosome exchanges corresponding parts with it homologue; dividing cells no longer identical to the parent |
Mendels principle of segregation | each hereditary char is controlled by two factors (alleles) which segregate and pass into separate cells |
Mendels principle of independent assortment | parts of factors (alleles) segregate independently of each other when cells are formed |
Genetic mutations | changes in genetic material of cells that pass from one generation to another |
Affects on DNA, ionizing radiation from radioactive materials | when it strikes electrons within the body with enough energy electrons are freed from atoms; free electrons strike & damage DNA directly. |
Why bone marrow cells in the gastro tract are more vulnerable to radiation damage | cells in the body that divide frequently have less time to repair DNA damage before that DNA is replicated and mutations are passed on. |
how cells, tissues, organs, and organ systems work together | glands release gastric juices; digestive enzymes & muscles combine to reduce our food to liquid; chyme exits stomach into small intestines; where digestion begins... acquiring energy for the body’s activities and protecting the body from disease. |
how our body maintains homeostatis | through all functions e.g. breathing, eating, excreting |
neurons, spinal cord and brain work together to respond to stimuli | neurons receive impulses and carry them from the sense organs to the spinal cord or brain |
cells, heart, arteries, and veins of the circulatory system transporting oxygen and carbon dioxide | red blood cells transport oxygen away from heart; through blood; arteries of the heart pump the oxygen blood away from the heart... |
cells, tissues, organs associate with digestive system break down food | glands release gastric juices; digestive enzymes & muscles combine to reduce our food to liquid; chyme exits stomach into small intestines; where digestion begins... |