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Characteristics of Living Things

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Presentation on theme: "Characteristics of Living Things"— Presentation transcript:

1 Characteristics of Living Things

2 Characteristics of Living Things
Made of Cells unicellular vs.. multicellular Red Blood cells Onion skin epidermal cells Human cheek cells

3 Characteristics of Living Things
2. Grows and develops Increase in cell size and/or number Includes: development, aging, death Differentiation – cell specialization for a certain job

4 Characteristics of Living Things
3. Obtains & uses Energy Metabolism (sum of all chemical reactions) Anabolism- simple to complex (build –up rxns.) Catabolism – complex to simple (break-down rxns.) Heterotrophic (other feeding) vs. autotrophic (self-feeding)

5 Characteristics of Living Things
4. Reproduces two kinds of reproduction: - asexual – takes one to make more - sexual – takes two

6 Characteristics of Living Things
5. Responds to the Environment a. Movement – internal or external b. Irritability - ability to respond to a stimulus Examples of stimuli : sight, sound, touch, pressure, temperature, chemicals, color, light, other? c. Adaptability

7 Taxonomy A. Definition = science of naming things & assigning them to groups

8 Taxonomy B. Why have a classification system?
1. Single, universal name 2. Avoid confusion 3. Understand how living things are related to one another

9 Taxonomy What are the FIVE common names of this animal?

10 Taxonomy Mountain Lion Cougar Puma (Florida) Panther Catamount
Rocky Mountain resident Florida resident

11 Taxonomy ¿Wouldn’t it be confusing if we didn’t have a scientific name? Felis concolor = scientific name of the mountain lion Genus species

12 C. Examples of classification systems:
Taxonomy C. Examples of classification systems: 1. Dewey decimal system – library 2. Sections of store – music store 3. Periodic Table of elements Chemistry 4. Others?

13 Taxonomy D. Binomial nomenclature System of scientific naming
Developed by Carolus Linnaeus (Swedish botanist) in 1750s Two part scientific name Genus and species Must be underlined or in italics In Latin (dead language of scholars)

14 Taxonomy E. Example : Homo sapiens (wise man) 1. Scientific name
for human beings 2. Homo = genus (capitalized & underlined) 3. sapiens = species (underlined, but NOT capitalized)

15 Taxonomy F. Definition of species = 1. breed successfully  viable,
fertile offspring 2. unique features similar to others of same species 3. have similar DNA to other species members

16 Taxonomy G. 7 Taxa of living things ( taxon = group) Kingdom (kings)
Phylum (play) Class (chess) Order (on) Family (fine) Genus (green) Species (silk)

17 Taxonomy H. Kingdom is least specific, largest group
I. Species is most specific, contains only one kind of organism

18 Taxonomy J. An example: Kingdom Animalia Phylum Chordata
Class Mammalia Order Primates Family Hominidae Genus Homo Species sapiens

19 K. Other Systems of Classification

20 K. Other Systems of Classification
2. Three Domain System

21 Taxonomy L. ¿ What determines how something is classified? 1. DNA
2. Structure

22 Taxonomy 3. Embryology & development

23 Taxonomy L. ☺There are 6 kingdoms of living things 1. Archaebacteria
2. Eubacteria 3. Protista 4. Fungi 5. Plantae 6. Animalia

24 Taxonomy M. Definitions Prokaryotic = does not have a
nucleus to contain its DNA Eukaryotic – has a membrane–bound nucleus

25 Taxonomy N. Unicellular Prokaryotic
1. Archaebacteria –ancient bacteria 2. Eubacteria – most bacteria Eukaryotic 3. Protista – single-celled O. Multicellular 4. Fungi – e.g. mushrooms 5. Plantae - plants 6. Animalia - animals

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