questions Flashcards
1
Q
Describe how a sample of chloroplasts could be isolated from leaves (4 marks)
A
blend cells and filter
place in cold isotonic buffer
spin in centrifuge to remove nuclei
at higher speed chloroplasts settle out
2
Q
Suggest one explanation for the faster rate of plasmid replication in cells growing in a culture with a high amino acid concentration (2 marks)
A
amino acids used in protein synthesis
more enzymes for DNA replication
3
Q
Describe the role of one named organelle in digesting bacteria (3 marks)
A
lysosomes
fuse with vesicles/phagosome
releases lysozymes
4
Q
Explain why it is not possible to determine the identity of the structures labelled X using an optical microscope (2 marks)
A
resolution too low
because light wavelength too long
