Exam (elaborations)
AQA AS BIOLOGY paper 1 specimen (7401_1)
AQA AS BIOLOGY paper 1 specimen (7401_1)
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AQA AS BIOLOGY paper 1 specimen(7401/1)
Describe how you could use cell fractionation to isolate chloroplasts from leaf tissue. -
ANS-- break open cells and remove debris
- use a cold solution
- the second pellet are chloroplasts
Equation to work out the length of a given organelle. - ANS-length of organelle
---------------------------
length of the scale bar
Name two structures in a eukaryotic cell that cannot be identified using an optical
microscope. - ANS-- ribosomes
- mitochondrion
A technician investigated the effect of temperature on the rate of an enzyme-controlled
reaction. At each temperature, he started the reaction using the same volume of
substrate solution and the same volume of enzyme solution. Give one other factor the
technician would have controlled. - ANS-concentration of the substate solution
Explain why the enzyme in DNA replication moves in opposite directions on each
strand. - ANS-- DNA has antiparallel strands
- shape of the nucleotides is different
- enzymes have active sites with specific shape
- only substrates with complementary shape can bind with active site of enzyme
What is the correct order of the classification system? - ANS-Domain
Kingdom
Phylum
Class
Order
Family
Genus
Species
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