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CHAPTER 2: Cells and organization

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This is a set of notes dealing with the second chapter of the IGSCE biology course, which concerns cell types and cell classification. It includes all the key features of plant and animal cells, including in-depth information about specialized cells and their adaptations. These study notes are also equipped with a list of essential vocabulary that will be used in teh IGCSE exams. The notes are well organized and can be easily read and understood, leaving you well prepared for the exam season

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ANIMAL CELLS

FEATURES​:
● Heterotrophic nutrition
● High metabolic rate


PART OF ANIMAL CELL FUNCTION

SECRETORY VESICLES - Hormone secretion
- Enzyme secretion

CYTOPLASM - The main place of all chemical reactions of a cell
- Contains water and dissolved substances
- Home to all major organelles

VACUOLES - Small + temporary
- Can be involved in digestion or excretion of water

GLYCOGEN - Storage form of energy in animals
-Stored in the liver

CELL SURFACE MEMBRANE - Surrounds cytoplasm
- Controls what goes in and out of cell (partially permeable)
- Separates cell’s content from surrounding

NUCLEUS - Contains DNA (hereditary information)

MITOCHONDRIA - Site of respiration where our body breaks down nutrients into
energy (ATP), via the Krebs cycle

RIBOSOME - Site of protein synthesis (links together amino acids in the
order that is specified by RNA)




PLANT CELLS

FEATURES​:
● Autotrophic nutrition
● Make energy via photosynthesis


PART OF PLANT CELL FUNCTION

CHLOROPLAST - Contain ​chlorophyll
- Contain enzymes

LARGE PERMEABLE VACUOLE - Can store ions and molecules
- Stores water

CELL WALL - Made of cellulose

, - Provides structural support
- Protects against damage made by osmotic water intake

CYTOPLASM - The main place of all chemical reactions of a cell
- Contains water and dissolved substances
- Home to all major organelles
- ​Contains​: Ribosomes, endoplasmic reticulum and
mitochondria (all main organelles)

NUCLEUS - Contains DNA (hereditary information)

CELL SURFACE MEMBRANE - Surrounds cytoplasm
- Controls what goes in and out of cell
- Separates cell’s content from surrounding

MITOCHONDRIA - Site of respiration where our body breaks down nutrients into
energy (ATP), via the Krebs cycle

RIBOSOME - Site of protein synthesis (links together amino acids in the
order that is specified by RNA)




ANIMAL AND PLANT CELL

DIFFERENCES​:
➔ Animal cells don't have...
-Cell wall
-Chloroplasts
-Large permanent vacuole
-Regular shape
-Starch as energy storage
➔ Plant cells don't have...
-Irregular shape
-Glycogen as energy storage

SIMILARITIES​:
➔ Cells surface membrane
➔ Cytoplasm
➔ Nucleus



SPECIALISED CELLS

● Cells specifically designed to perform one or more functions
● Have specific adaptations and features which help them perform

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2019/2020
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