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CHAPTER 1. HONORS BIOLOGY. I. BIOLOGY. Study of life and how living organisms interact with their environment Because encompasses so much, scientists have created hierarchy of organization. Hierarchy of organization. Biosphere Ecosystem Community Population Organism Organ System

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Chapter 1




I biology

  • Study of life and how living organisms interact with their environment

  • Because encompasses so much, scientists have created hierarchy of organization

Hierarchy of organization
Hierarchy of organization

  • Biosphere

  • Ecosystem

  • Community

  • Population

  • Organism

  • Organ System

  • Organs

  • Tissues

  • Cell

  • Organelle

  • Molecules

  • Atoms






Organ systems







Ii living organisms their environment
II. Living Organisms & their Environment

  • Interactions of organisms with environment make up a web or relationship within ecosystem

    • Ex. Producers, consumers, decomposers

  • Success of ecosystem depends on:

    • Recycling of chemical nutrients - nonliving, required for life

    • Recycling of chemical nrg - enters as light exits as heat


(such as plants)






Chemical energy


(such as animals


Iii cells basic unit of life
III. Cells - Basic Unit of Life

  • Cells are the basic unit of life because

    • Make up all living organisms

    • Smallest structure that can perform all activities needed to live

Types of cells
Types of Cells

  • Prokaryotic


    karyote -


    No membranous organelles

  • Eukaryotic

    Eu -

    Karyotic -

    Nucleated, more complex, larger

Iv unity of life
IV. Unity of Life

  • All living organisms have common denominator --- DNA

  • Structure

    • Double helix

    • 5 carbon sugar

    • Phosphate

    • Nitrogen base (A,T,C,G)

  • Function -

    • Instructions for cells activities

    • Blueprint of life

    • Order of bases are important


Single strand of DNA

V characteristics of life
V. Characteristics of Life

  • 7 Characterics all living things share

    • Heirarchy / Order

    • Homeostasis / Regulation

    • Growth/development

    • Metabolism / nrg processing

    • Respond to env.

    • Reproduce

    • Evolve

Vi diversity of life
VI. Diversity of Life

  • Diversity results from the difference in the structure of DNA (order of bases)

  • Approx 1.8 million known species

  • Scientists believe 10 - 200 million exist

  • To organize and classify all these organisms scientists use TAXONOMY (name and classify organisms)

Heirarchy of organization
Heirarchy of Organization

  • D

  • K

  • P

  • C

  • O

  • F

  • G

  • S

3 domains 6 kingdoms
3 Domains/ 6 kingdoms

  • Bacteria - prok.simple, most unicellular

    • Includes eubcteria kingdom

  • Archae - prok., simple, most unicellular, live in harsh conditions

    • Includes archaebacteria kingdom

  • Eukarya - euk.

    • Includes protists, animalia, plant, fungus kingdoms

      All these domains are interconnected through web of life

Vii evolution
VII. Evolution

Evolution occurs as a result of diversity

Evolution- change in a population over time

Charles darwin

Father of evolution -

Published a book

“On Origin of Species b Means of Natural Selection”

2 main points of theory of evolution:

1. Descent with Modification:

all living species descended from a common ancestor, but changed over time(descent with modification to adopt to environment.

2. Natural Selection

2 concepts of natural selection

  • Individuals within a population have variety which allows them to survive in the environment

  • Overproduction and competition - population produce more offspring then will survive, with more individuals in env. competition occurs (natural selection)









Viii how do scientists learn
VIII. How Do Scientists Learn?

  • Science - “to know”

  • 2 approaches to study science

    • Discovery Based Science

    • Hypothesis based Science

A discovery based science
A. Discovery Based Science

  • Describes nature

  • Uses observations and measurements

  • Describes natural phenomenon

  • Based on INDUCTIVE reasoning (observations)

  • Ex. Because can see cells under a microscope in all living organisms, conclude that all living organisms are made of cells

B hypothesis based science
B. Hypothesis Based Science

  • Propose and test a hypothesis

  • Leads to prediction to be tested (if then statements)

  • Based on Deductive Reasoning (general to specific)

    Ex. IF all organisms are made of cells THEN humans are made of cells

Steps to hypothesis based science
Steps to hypothesis based science

  • Scientific Method - sequence of steps to solve a scientific problem

  • 6 basic steps

  • Used by all scientists to create a standard to communicate results.

    Sharing Information

  • Publication

  • Peer reviewed publication

Types of experiments
Types of Experiments

  • Blind study- patient does not know if getting medicine or not

    • Eliminates bias on patient part

  • Double Blind -

    • Patient and scientists does not know if getting the real medicine or placebo

    • Eliminates bias on both sides

Laws and theories
Laws and Theories

  • Theory - hypothesis tested over long time. Can be modified

    • Ex. Theory of evolution …….

  • Law - Theory tested over long period of time.

    • Newton’s laws……

Xi bio connected to our lives
XI. Bio Connected to our Lives

  • It explains

    • relationship b/t all living organisms

    • Diversity of organisms

    • How the env. Affects organisms and their change

    • How science and technology are interdependent

Science and tech interdep
Science and tech. interdep.

  • How science and technology are interdependent


  • Food - genetically modified

  • Air and water pollution

  • Cloning/stem cell

  • Nutritional supplements

  • Medical technology

  • Genetic engineering (vaccines, cures, etc…)

  • medicine to help us live longer and healthier

  • Living longer and healthier - good or bad?

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