Classification Concepts

The 3 Domains of Life 3) Eukaryotes

1)Bacteria2) 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 food2 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:

________________________