Biology Paper1 notes

What is a cell

Cell is the simplest unit of life

How many cells are in humans average?

40 trillion

What type of cell is animal, plant and bacterial cells?

Animal and plant cells are eukaryotic whereas bacterial cells are prokaryotic.

What organelles are present in animal and plant cells?

. Nucleus

.cytoplasm

.cell membrane

.ribosomes

.mitochondria

What organelles are only present in plant cells?

.chloroplasts

.permanent Vacuole

.cell wall

What organelles are present in bacterial cells?

.cell wall

.cell membrane

.cytoplasm

.ribosomes

.circular strand do dna( circular chloroplasts/ nucleoid)

.some have:

.plasmids

.flagella

Bacterial cells are unicellular meaning they can reproduce asexually to create new organisms, what do animal and plant cells do?

Animal and plant cells are multicellular meaning they have many cells that grow and divide in order to replace dead cells and they cannot create new organisms

What is the function of ribosomes?

Site of protein synthesis

What is function of mitochondria?

Provides energy to cells for chemical reactions such as aerobic respiration.

Function of cell wall?

Cell wall is rigid. made of cellulose, provides extra strength and support to the cell.

Function of cell membrane?

Control what substances enters and exits the cell

Function of nucleus?

Contains genetic material, controls activities.

Function of cytoplasm?

Site of chemical reactions

Function of permanent vacuole

Contains cell sap( made of sugars,salts)

Function of chloroplasts?

Site of photosynthesis, contain chlorophyll which absorbs energy from the sun. Has green colour

Function of plasmids?

Carry extra genes

Flagella function?

Movement of bacterial cell.