DNA/Cells/Chemical Control Big Mark Questions

Created by: Zac102003
Created on: 08-12-20 19:41

Explain how the structure of DNA is related to its functions (6)

1- Sugar-phosphate (backbone) provides strength
2- Large molecule so can store lots of information
3- Helix / coiled so compact;
4- base sequence codes for amino acids / protein;
5- Double stranded so S-CR can occur
6-weak H bonds for separation

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Describe and explain how the structure of DNA results in accurate replication (4)

1- two strands = S-C replication (possible)
2- hydrogen bonds holds strands together
3- H bonds easily broken=allow strands to separate
4- bases act as template / can be copied
5- complementary base pairing copy
6- DNA one parent and one new

2 of 6

Describe the behaviour of chromosomes during mitosis and explain how this results in the production of two genetically identical cells (7)

1- chromosomes supercoil
2- chromosomes each two identical chromatids
3-chromosomes move to equator of cell
4-attach to individual spindle fibres at centromere
5- spindle fibres contract and centromere divides
6- sister chromatids move to opposite poles

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ATP is useful in many biological processes. Explain why (4)

1- releases energy in small manageable amounts
2- broken down in one step / single bond / energy available rapidly
3- phosphorylates other substances = more reactive
4- reformed and made again

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Describe how ATP is made in mitochondria (6)

1- ATP produced in Kreb's cycle
2- Kreb's and link produce reduced NAD and FAD
3- e- released from reduced coenzymes
4- e- pass along ETC in REDOX reactions
5-energy released
6- H+ move into the inter-membrane space
7- move back through ATP Synthase

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Plants produce ATP in their chloroplasts during photosynthesis. They also produce ATP during respiration. Explain why it is important for plants to produce ATP during respiration in addition to during photosynthesis (5)

1- In the dark no ATP production in PS
2- Some tissues unable to PS / produce ATP
3- ATP cannot be moved from cell to cell / stored
4- Plant uses more ATP than produced in PS
5- ATP for active transport / synthesis (of named substance)

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Other cards in this set

Card 2

Front

Describe and explain how the structure of DNA results in accurate replication (4)

Back

Card 3

Front

Describe the behaviour of chromosomes during mitosis and explain how this results in the production of two genetically identical cells (7)

Back

Card 4

Front

ATP is useful in many biological processes. Explain why (4)

Back

Card 5

Front

Describe how ATP is made in mitochondria (6)

Back

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DNA/Cells/Chemical Control Big Mark Questions