Aim: How do plant & animal cell organelles maintain homeostasis?

DO NOW:Read the “Cell Theory Rap” handout & on loose-leaf, explain why we looked at this rap, choose 2 organelles & write down their functions.

Organelles

• “mini-workers” inside of cells that have specific jobs

• Lie in the cytoplasm of both animal & plant cells (eukaryotes)

Nucleus

• Brain of the cell• Contains DNA or genetic instructions (Nucleic

Acid)• Has a membrane with pores

Nuclear Membrane• Membrane of the nucleus• Also called nuclear envelope

Nucleolus

• Inside nucleus• Makes ribosomes

Ribosomes

• Make proteins• Found freely in cytoplasm or attached to

endoplasmic reticulum

Mitochondria

• Site of cellular respiration (chemical reaction)• ATP Energy producing organelle• Powerhouse of the cell

Vacuoles

• Storage sacs for food or water or excess waste, that will eventually be eliminated

Endoplasmic Reticulum

• Cellular highway• Allows for more efficient transport inside of

cells• 2 Types: Smooth & Rough• Rough: contains ribosomes, which make

proteins• Smooth: no ribosomes

Golgi Bodies / Apparati

• Packaging organelle for proteins (sorts, modifies & packs proteins)

Lysosomes

• Located in both animal and plant cells• Contain digestive enzymes for breakdown of

wastes (Ex. damaged cells or old cell parts)

Centrioles

• Only in animal cells• Look like cylinders• In pairs, near the nucleus• Involved in cell division

Chloroplast

• Only in Plant Cells• Site of Photosynthesis (chemical reaction)• Food (Glucose) Producer• Contains chlorophyll pigment (allows for

absorption of sunlight)

Cell Membrane

• Barrier between inside & outside of cells• Regulates what enters & exits cells

Cell Wall

• Made of cellulose (tough carbohydrate)• Lies outside the cell membrane in plant cells

and bacteria, fungal organisms and some protists

• Offers Support & Protection

Cytoplasm

• Similar function to that of the human body’s circulatory system

• Site of most chemical reactions in a cell• Holds organelles in place• Mostly made of water• “gel-like” fluid that surrounds the nucleus

Brain-Pop Video

• https://www.brainpop.com/science/cellularlifeandgenetics/cellstructures/

Activity

Homework

• Castle Learning Questions on Organelles