AS Biology This is a product of the

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AS Biology This is a product of the science department of Dartford Technology College

AS Biology This is a product of the science department of Dartford Technology College

Endoplasmic Reticulum • Hen+ Dough + Plaice + Mike + Wreck + Tickle +

Endoplasmic Reticulum • Hen+ Dough + Plaice + Mike + Wreck + Tickle + Hem. • Complex system of sheet like double membranes continuous with the nuclear membrane • Two types of ER – – smooth – has no ribosomes attached (RER) – rough – has ribosomes attached (SER)

Golgi Body • Goal + Guy + Body • Formed from small pieces of

Golgi Body • Goal + Guy + Body • Formed from small pieces of rough ER which form small vesicles which join to make a Golgi body

My

My

Mitochondria • My + Toe + Con + Dry + Hair. • Relatively large

Mitochondria • My + Toe + Con + Dry + Hair. • Relatively large organelle • Rod/sausage shaped – 1 um – 5 um • Have a double membrane – The outer controls the entry & exit of materials – Inner has many folds called cristae

Centriole • Cent + Tree + Hole. • Two short bundles of hollow cylinders

Centriole • Cent + Tree + Hole. • Two short bundles of hollow cylinders (microtubules) positioned at right angles to each other • Found just outside the nucleus in a clear area of cytoplasm called the centrosome • Wall of each centriole is made of 9 triplets of tubes arranged at an angle

Ribosome • Rye + Bows + Home. • Small dense structures found in huge

Ribosome • Rye + Bows + Home. • Small dense structures found in huge numbers. • Can be attached to the rough ER of floating in the cytoplasm. • Are about 20 – 25 nm in diameter in eukaryotic cells and slightly smaller in prokaryotic cells

ER

ER

Chloroplast • Claw + Row + Plaster + (take away ER) • Found inside

Chloroplast • Claw + Row + Plaster + (take away ER) • Found inside photosynthetic tissues of plants (abundant in palisade mesophyll cells of leaves) • Flat discs 2 -10 um in diameter & 1 um thick • Have a double membrane called the chloroplast envelope • Inner membrane folded into a series of lamellae

Nuclear Envelope • Nuclear (bomb) + Envelope. • The nucleus is surrounded by a

Nuclear Envelope • Nuclear (bomb) + Envelope. • The nucleus is surrounded by a nuclear membrane / envelope • Double membrane – outer is continuous with the ER • Nuclear pores in the membrane allow the passage of large molecules in & out (eg messenger. RNA)

Nucleolus • New + Clay + Hoe + Lass. • A spherical structure called

Nucleolus • New + Clay + Hoe + Lass. • A spherical structure called the nucleolus is found in the nucleus – this makes ribosomal RNA and assembles the ribosomes.