Functions Of Organelles

Question 1

Nuclear envelope

Answer 1

Pores allow passage of large molecules such as mRNA and ribosomes

Question 2

Nucleolus

Answer 2

Site of formation of rRNA

Question 3

Nucleus (2)

Answer 3

• Contains DNA which provides a template for DNA replication.
• Chromosomes which direct protein synthesis because they are the site of transcription

Question 4

Rough endoplasmic reticulum

Answer 4

Transports proteins made at the ribosomes

Question 5

Smooth endoplasmic reticulum

Answer 5

Associated with the synthesis and transport of lipids

Question 6

Ribosomes

Answer 6

The site of translation of mRNA and assembly of amino acids to form proteins

Question 7

Mitochondria

Answer 7

Produce ATP in aerobic respiration

Question 8

Lysosomes (2)

Answer 8

• Digest worn out organelles and materials that have been taken into the cell (e.g. bacteria)
• Isolate potentially harmful enzymes from the rest of the cell

Question 9

Golgi apparatus (4)

Answer 9

• Makes secretory enzymes packaged into vesicles
• Forms lysosomes
• Transports and stores lipids
• Produces glycoproteins for export form the cell

Question 10

Centrioles

Answer 10

Organise the micro tubules that make the spindle

Question 11

Chromatin

Answer 11

Condenses to form chromosomes (DNA)

Question 12

Plasmodesmata

Answer 12

Strands of cytoplasm forming a network which pass through the pores (called pits) of cell walls

Question 13

Chloroplasts

Answer 13

Enables photosynthesis so plants can convert light energy into chemical energy

Question 14

What is the purpose of cristae in mitochondria?

Answer 14

To give a large surface area for the attachment of enzymes involved in respiration

Question 15

What are cisternae?

Answer 15

Interconnected fluid-filled spaces between the flattened sacs in the ER