4-mark practice questions — OCR A-Level Biology A (H420)
146 questions · biology · View as Markdown
How to answer
4-mark questions are the shortest levels-of-response band. Aim for four scientific ideas, each in its own short sentence.
Sample questions
- Explain how the structure of a sieve tube element is adapted to allow the mass flow of assimilates through the phloem.
- A student claims that the tropistic response of a shoot to light is entirely explained by the presence of auxin on the s…
- A research team used CRISPR-Cas9 to introduce a loss-of-function mutation into a gene encoding a transcription factor in…
- Explain why the tertiary structure of an enzyme is essential for its function, referring to the role of bonds that maint…
- Explain how the structure of a sieve tube element is adapted for the mass flow of assimilates through the phloem.
- Explain how the structure of a sieve tube element is adapted for its function in the phloem.
- Explain why totipotency in plant cells makes it possible to produce large numbers of genetically identical plants from a…
- Explain why a restriction endonuclease and DNA ligase are both required when inserting a human gene into a bacterial pla…