Cell structure (easy)

Question 1

Explain why some organelles are not visible using a light microscope [2]

Answer 1

1. Resolution is not high enough

2. Organelles too small to interfere with light waves

Question 2

Explain why mature RBCs cannot metabolise fatty acids [2]

Answer 2

1. No mitochondria to produce ATP

2. No nucleus to express genes coding for enzymes needed to metabolise fatty acids

Question 3

State features of the mitochondrion that supports the endosymbiont theory [4]

Answer 3

1. Singular circular DNA
2. Absence of introns in mtDNA
3. 70S ribosomes
4. Absence of membranous organelles