Presentation on theme: "Unit 3 Structure and Function Notes Part 1 It’s Alive or, Is It?"— Presentation transcript:
1 Unit 3 Structure and Function Notes Part 1 It’s Alive or, Is It? M.ElizabethMartin Luther King, Jr. JHS2005
2 Chapter 2 It’s Alive, or Is It 2.1 Characteristics of Living Things2.2 The Simple Bare Necessities of Life2.3 The Chemistry of LifeChapter 2 Review
3 2.1 Characteristics of Living Things The six characteristics of Living Things:All living things have cellsAll living things sense and respond to changeAll living things reproduceAll living things have DNAAll living things use energyAll living things grow and develop
4 2.1 Characteristics of Living Things All living things have cellsUnicellular (single celled organisms)Multicellular (organisms made of more than one kind of cells)Excludes viruses because virus are organisms that are made of DNA/RNA and a protein coat – not exactly a cell.
5 2. All living things sense and respond to change An important part of sensing and responding to environmental changes is maintaining homeostasis.Homeostasis– the maintenance of a stable internal environment despite a changing external environment
6 3. All living things reproduce There are two types of reproduction:Asexual – a single parent produces an identical offspring.Lots of organisms reproduce this way (bacteria and algae). When cells are cloned they are reproduced in this way.Sexual – requires two parents. Results in a lot better chance for genetic variation.
7 4. All living things have DNA DNA – deoxyribonucleic acidProvides instructions for making molecules – proteins that take part in all cellular functions and in the synthesis of other kinds of molecules needed for cells to exist.Reproduction involves making copies of DNA that is transferred to offspring.The transmission of characteristics/traits from one generation to another is called ____________heredity
8 5. All living things use energy Metabolism – all chemical activities that use or make available energy.Producers – organisms that obtain energy from the sun (photosynthetic) or certain bacteria that use inorganic chemicals (chemosynthetic)Consumers – organisms that obtain energy by eating other organisms.Decomposers – Organisms that get their food from breaking down nutrients from dead organisms or animal wastes.
9 6. All living things grow and develop Even single celled organisms like bacteria grow slightly in size.Babies grow to adult
10 2.2 The Simple Bare Necessities of Life FoodWaterAirA Place to Live
11 Food We have discussed: make their own food eat other organisms ProducersConsumersDecomposersFood eaters can also be broken down into type:AutotrophsHeterotrophsmake their own foodeat other organismseat dead organisms- Create their own food- Obtain food from others
12 Essential Elements – Chemistry of Life The basic elements that make up most of biological molecules areCarbonHydrogenNitrogenOxygenPhosphorousSulfur
13 Main Types of Molecules – Chemistry of Life The Main Types of Biological MoleculesProteins – made of amino acids. Enzymes are special proteins that allow cell reactions to occur.Carbohydrates – made of sugarsLipids – fats, phospholipidsNucleic Acids – made of nucleotidesATP – useable cellular energy – adenosine tri phosphate a high energy nucleotide
14 Water Water is the essence of life 70 percent of most cells are made of waterHumans can survive about 3 days without waterThe chemical formula for water is H2O
15 AirMixture of several different gases the main ones in order of highest concentration:NitrogenOxygenArgonWater VaporCarbon Dioxide
16 Oxygen and Carbon Dioxide Oxygen is used for aerobic respirationOxygen is not used for anaerobic respirationGreen plants and other photosynthetic organisms need carbon dioxide in addition to oxygen.The carbon dioxide is for photosynthesis and oxygen used for aerobic respiration.
17 A Place to liveSome organisms need a lot of space to live which is why governments are starting to create habitat management plans so that there are places for animals to live because people have out competed animals for the living place resource.
18 Could life as we know it exist on Earth if air only contained oxygen? Life could not exist as we know it if air only contained oxygen because green plants, algae, and some bacteria need carbon dioxide gas as well as oxygen. Without carbon dioxide photosynthesis could not occur and there would not be producers which consumers need to eat.
19 Review phospholipids asexual Nucleic acids Heredity Metabolism In the cell membrane, ________________ (protein or phospholipid) molecules form two layers.When a planarian worm is cut in half, each half develops into a whole worm. This is an example of __________ (asexual or sexual) reproduction.(Proteins or Nucleic acids)______________ are sometimes called the blueprints of life.(Homeostasis or Heredity) _______________is the passing of traits from one generation to the next.(Metabolism or Homeostasis) _____________ refers to all of the chemical activities that an organism’s cells perform.asexualNucleic acidsHeredityMetabolism
20 6. _________ is a complex carbohydrate manufactured by plants. Starch6. _________ is a complex carbohydrate manufactured by plants.a. Oil c. Starchb. Protein d. Hemoglobin7. When a duck dives under water, its inner eyelids automatically raise to cover the duck’s eyes. In this case, water acts as__________a. homeostasis. c. a reaction.b. a stimulus. d. an enzyme.8. The molecule that provides energy for cellular processes is__________a. ATP. c. RNA.b. DNA. d. protein.a stimulusATP
21 amino acids. nucleotides. nucleic acids 9. The subunits of proteins are __________a. enzymes. c. nucleotides.b. amino acids. d. sugar molecules.10. The subunits of nucleic acids are __________11. Cells do not use ___________for energy storage.a. fats c. carbohydratesb. oils d. nucleic acidsnucleotides.nucleic acids
22 Chapter 1 ToolsThere are two types of microscopes that we will discuss:Compound light microscopes - uses light and two lensesElectron microscopes - have better resolution than compound light microscopes and uses an electron beam.
23 Microscopy Vocabulary Resolution – the ability to clearly distinguish the individual parts of an objectMagnification – the enlargement of a structure by means of bending the light that passes through lenses in the case of a light microscope or a beam of electrons in case of an electron microscope
24 LensesConvex lens: the ______ of the lens is thicker than the __________.Concave lens: the ______ of the lens is thicker than the __________.middleedgeedgemiddle