Classification Concepts

The 3 Domains of Life 3) Eukaryotes 1)Bacteria 2) Archaeabacteria

(1) The three domains of life are 1. ______________ 2. ______________ 3. ______________ (2) Humans belong to the ______________ domain.

How are organisms classified into groups? ANSWER: By grouping them together based on characteristics such: 1) their cell structure 2) how they get food 3) how they reproduce

I. Cells – the basic unit of life all cells have genetic information in DNA unicellular (one-celled organism) multicellular (many cells)

(3) Humans are (unicellular or multicellular)? (4) All organisms store genetic information in molecules of ______.

Two Types of Cells prokaryote – cells without a nucleus no membrane organelles all bacteria ancient (1st to evolve) eukaryote – cells with a nucleus have membrane organelles

(5) The first organisms to evolve were _________ (6) Humans are ____________ (write one: prokaryotes or eukaryotes)

Cell wall possibilities in organisms 1) no cell wall 2) cell wall made of cellulose 3) cell wall made of chitin 4) cell wall with peptidoglycan

Cell wall MATCHING ORGANISMS (7)ANIMALS (8)PLANTS (9)FUNGI (10) SOME BACTERIA CELL WALL TYPE No cell wall Cellulose Chitin Peptidoglycan

II. Mode of Nutrition Autotrophs – make their own food 2 TYPES photoautotroph – from light (photosynthesis) chemoautotroph – from sulfur-based chemicals Heterotrophs – eats other organisms Ex.) decomposer – eats dead/decaying organisms

Online 11) An example of an autotroph (that you never heard of) is: ________________________ 12) An example of a heterotroph (that you have never heard of before) is: ________________________

III. Reproduction asexual (without sex) binary fission – DNA copies and divides (unicellular organisms) offspring are clones (identical to parent) 1N (one of each type of chromosome) sexual - two parents each provides half the offspring’s chromosomes 2N (two of each, one from each parent) *increases genetic variety in a species

13) Humans have _______ chromosomes. ____ from mom, ____ from dad. 14) Draw an organism undergoing binary fission. Provide two other types of asexual reproduction.

IV. Respiration aerobic – requires oxygen anaerobic – lives in absence of oxygen

15) An example of an anaerobic species is : ________________________

V. General terms for habitats terrestrial – lives on land aquatic – water environment marine = (ocean water environment)

FIND an example of 16) A terrestrial fungi: ________________________ 17) An aquatic protist: ________________________ 18) A marine animal: ________________________