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INTRO TO BIOLOGY - PowerPoint PPT Presentation

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INTRO TO BIOLOGY
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  1. INTRO TO BIOLOGY OTHERWISE KNOWN AS REGENTS LIVING ENVIRONMENT

  2. THE SCIENTIFIC METHOD: • The goal of science is to INVESTIGATE and understand nature, to explain events in nature, and to use those explanations to make useful HYPOTHESES. • We investigate by making OBSERVATIONS using our 5 senses to collect DATA.

  3. A HYPOTHESIS is an educated guess based on observed characteristics of an object. • IF…THEN… • Example: If I study my vocabulary words, then I will do well on the quiz. • Example: If I fall asleep in class, then Mrs. Weber will come over and whoop me upside the head 

  4. Design a Controlled Experiment: • State the problem • Form a hypothesis • Set up a controlled experiment • Record & analyze data • Draw a conclusion • Retest!

  5. VARIABLES: • Experimental group – the group that is being tested – getting the actual “experiment” • Control group – the group that is NOT being tested, but rather being used to check the VALIDITY of the experiment – getting a PLACEBO

  6. Variables… • Independent Variable – the researcher can “control” this – x axis of graph • Dependent Variable – the outcome the researcher is testing – y axis of graph

  7. THEORIES: • A theory is a HYPOTHESIS that covers a broad range • Example: the THEORY of Evolution • Example: the Big Bang THEORY

  8. How do you Improve an Experiment? • Reduce experimental BIAS • Redo the Experiment • Increase the sample size • Control other variables

  9. so... what IS Biology???? • BIO = LIVING • OLOGY = STUDY OF • BUT WHAT IS THE DIFFERENCE BETWEEN LIVING & NON-LIVING? • SCIENTISTS HAVE NOT BEEN ABLE TO AGREE ON A SINGLE DEFINITION THAT CHARACTERIZES LIFE!!!

  10. LIVING VS. NON-LIVING:(ORGANIC VS. INORGANIC) • Living things carry out almost all of the LIFE FUNCTIONS • Nutrition, transport, respiration, excretion, regulation, synthesis, growth, reproduction, metabolism, immunity, locomotion, • Non-living things cannot carry out at least one or more of these functions

  11. So what is LIVING then?...

  12. NUTRITION: • Process by which an organism converts inorganic and organic “foods” into a more usable form of energy • Autotrophic organisms MAKE their own food – example: PLANTS • Heterotrophs cannot make their own food – people • Nutrition involves both ingestion & digestion

  13. TRANSPORT: • Movement of materials (nutrients, essential gases, wastes, hormones, etc.) throughout the organism • WITHIN A CELL THIS IS KNOWN AS CIRCULATION • Absorption takes nutrients into the cell – transport gets the nutrients to where they need to be!

  14. MOVEMENT: • ACTUAL PHYSICAL MOTION • Also called LOCOMOTION • Usually associated with some sort of survival need and quite often dependent on the physical size of the organism • (a blue whale will move much farther in its’ lifetime than an ant will, for example)

  15. RESPIRATION: • THIS IS NOT BREATHING!!!!!!!! • THE PROCESS THAT CONVERTS THE ENERGY FROM FOOD INTO ATP (THE FORM OF ENERGY THAT CAN BE USED BY CELLS) • IT IS A RELEASE OF ENERGY by an EXCHANGE of gases! • Organism that need OXYGEN for respiration are called AEROBIC • Organisms that do not need Oxygen are called ANAEROBIC

  16. EXCRETION: • Not what you think…. THIS IS NOT simply urination and defecation • It’s the release of cellular waste products into the transport system for removal from the organism • (CO2, water, urea, urine, sweat…) • EGESTION – removal of UNDIGESTED material (regurgitation) • EXCRETION – removal of waste/byproducts

  17. REGULATION: • MAINTAINS A STATE OF HOMEOSTASIS IN THE BODY • Any activity which an organism does to try and maintain its’ internal environment. This includes: brain activity, nervous function, release of hormones, etc… • A change in the environment is called a STIMULUS which causes a physical response from an organism • EX: • NERVOUS & ENDOCRINE SYSTEM – deals with COORDINATION – controls various activities of the organism

  18. METABOLISM: • The energy level that an individual organism must maintain to stay alive • Every organism, even those within a species, has its’ own personal metabolic rate • EX: Some people eat TONS of food but never seem to gain weight – they have very fast metabolisms that utilize the energy from food faster

  19. HOMEOSTASIS is… • … the ability of living organisms to maintain a DYNAMIC EQUILIBRIUM with its surroundings by carrying out the LIFE FUNCTIONS • … a state of BALANCE between a living thing and its environment • … constantly threatened!

  20. HOMEOSTASIS… • Ex: environmental temp increases ----> more sweating ---> more evaporation --< cools down body • Ex: Blood sugar regulation insulin -- a hormone (chemical messenger) produced by the pancreas and carried through the blood -- lowers blood sugar 2 major ways: a.) Takes glucose into our cells to be used as fuel in cell respiration from our blood b.) Converts excess glucose to the glycogen (animal starch) and stores it in our liver and muscles

  21. SYNTHESIS: • THE PRODUCTION OF MORE COMPLEX SUBSTANCES BY COMBINING 2 OR MORE SIMPLE SUBSTANCES • EX: 1 Hydrogen + 2 Oxygen = water • EX: FAT!

  22. GROWTH: • Simply the increase in the size of cells (at an embryonic stage) or an increase in the number of cells (throughout life) • Growth stops when an organism experiences death

  23. REPRODUCTION: • The making of more organisms of one's own kind -- not needed by an individual living thing but is needed by its species • You are reproducing right now! • This is not always a SEXUAL event • Your cells are being replaced at all times • More often, it is ASEXUAL • Some organisms are completely asexual

  24. IMMUNITY: • The ability to defend yourself against disease or allergies • Organisms have a complex system of defending against both pathogens (disease causing organisms) and allergens (chemicals that cause allergic reaction)