A Level Paper 1 Qs

Question 1

Give 2 features of prokaryotes that aren’t in eukaryotic cells

Answer 1

Single loop of DNA
DNA free in cytoplasm
Peptidoglycan in cell wall

Question 2

Describe viral replication

Answer 2

Attachment protein on receptors
Nucleic acid enters cell
Nucleic acid replicated in cell

Question 3

Explain rate of transpiration between 5am and midday

Answer 3

Rate increases due to increased temperature
So increased kinetic energy
Stomata open after 5am allowing gas exchange
Stomata close after midday

Question 4

Differences in tRNA molecules to DNA molecules

Answer 4

Deoxyribose vs ribose
Double stranded vs single stranded
Many nucleotides vs very few
Thymine vs uracil

Question 5

How do scientists remove large organelles from the suspension of cell contents?

Answer 5

Low centrifuge speed
Increasing sequence of speed
Densest organelles removed first
Smaller organelles removed next