1.2 Cell Structure And Organisation

Question 1

Function of mitochondria

Answer 1

Aerobic respiration-produces ATP
CRISTAE- provide large SA for attachment of enzyme
Much higher numbers in metabolically active cells
Fluid filled matrix- contains lipids, proteins, 70S ribosomes
Present in all cells
1/10nm
Cylindrical

Question 2

Chloroplasts

Answer 2

In photosynthetic plants
Site of photosynthesis
Double membrane- contain fluid filled stroma: with starch grains, 70S ribosomes and circle of DNA

THYLAKOID- flattened membrane: stacks of thylakoids contain photosynthetic pigments- including chlorophyll
Inner membrane is not folded

Question 3

Endoplasmic reticulum

Answer 3

Double membrane form interconnected flattened fluid-filled sacs called cisternse. This is connected to the nuclear envolope
Main role is to transport materials through the cell.

Question 4

Rough ER

Answer 4

Ribosomes attached to surface

Once proteins have been synthesised at ribosomes they are transported via cisternae

Question 5

Smooth ER

Answer 5

No ribosomes

Involved with synthesis and transport of lipids

Question 6

Function of a nucleus

Answer 6

DNA- coding for protein synthesis
Nucleolus- production of rRNA and Ribosomes
Pores- allow mRNA to leave nucleus
Contains chromatin