Biology Exam Review 1 PDF

Preview

Summary

Biology Exam 1 Review with definitions and cell structure...

Description

Biology Exam Review 1: Cell Basic unit of structure of living cells.

Cell Theory ● All organisms are made up of cells, ● Smallest organisational unit, Biogenesis Cells derived from preexisting cells.

Plasma Membrane Also known as the cell membrane. Separates the outside environment from inside of the cell as well as controlling what enters and exits the cell. Cytoplasm Made up of the cytosol, and organelles (Eukaryotes.) While 80% is water, it also contains ions, salts and organic molecules. DNA Holds the hereditary information that's passed between generations.

Ribosomes These organelles are responsible for the synthesis of proteins. Prokaryotes ● Unicellular ● Lacks nucleus ● No membrane-bound organelles ● Found in extreme conditions ● single DNA chromosomes (genophore) ● Genosphore found in nucleoid ● Cell wall (prevents damage and dehydration) ● Flagella enables free movement ● Pili involved in transferring DNA Eukaryotes ● Membrane bound organelles ● Nucleus ● Specialised organelles Atom - Tiniest part of all living and non-living things. Kingdoms - Classifications of Living things. Mammals - Living things with vertebrae, hair or fur, give birth to babies, feed the babies milk from their bodies & warm blooded.

Birds -

May or may not fly, with vertebra, lay eggs, have feathers

Reptiles - Land & water animals, no vertebra, most lay eggs some have babies, smooth or rough scaly skin, no legs or arms. Amphibians - Mostly water animals but can live on land, smooth or rough scaly skin, lay eggs & may have lungs....