Biology One Review

Published by polishswimmerjz
January 19, 2010, Category: Biology

This is a review of Biological terms and knowledge necessary to succeed in biology.

- Are in multicellular organisms

- More complex

- Usually have one primary function

9) Identify levels of multicellular organisms.

1) Cell- Basic unit of life

2) Tissue- Group of the same cells that perform a specific function

3) Organ- Group of tissues that perform a specific function

4) Organ system- Group of organs that work together to perform a specific function

Difference between Animal Cell and Plant Cell

- Animal cell- has no cell walls, and chloroplasts

- Plant Cell- has no unique structure of lysosomes

Read more in Biology « Pests Affecting Lumber Cell Theory Evolution » Cell	Basic unit of life
Cell membrane	Thin, double-layered sheet around the cell
Cell wall	Strong layer around the cell membrane that protects the cell
Nucleus	Large structure that contains the cell’s genetic information
Cytoplasm	Portion of the cell outside the nucleus
Prokaryote	Organism whose cells do not contain a nucleus
Eukaryote	Organism whose cells contain a nucleus
Organelle	Specialized structures within a cell that perform important cell functions
Chromatin	Granular material visible within the nucleus

Cell Growth and Division

Mitosis

1) What are the main events of the cell cycle

Purpose: Replicate body cells

Parent cells- Diploids

Daughter cells- haploid

Genetic likeness- identical

Cell division of body- somatic cells

Timing of cell cycle regulated by cyclins

G1- is the longest phase, because cell growth occurs

The importance of internal regulators is to tell the cell when to perform certain functions such as cell division and DNA replication

External regulators respond to events outside the cell by speeding up or slowing down the cell cycle

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