AQA GCSE Biology

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• drifting movement in fishes during migration​
  Drifting movement is a significant aspect of fish migration, particularly
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• classification of fishes based on migration in dams in india
  Fish migration is a critical aspect of aquatic ecosystems, significantly
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• Do fish migrate in the winter?
  Fish exhibit diverse migratory behaviors during winter, influenced by species-specific
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• Topoisomerase: – A. Separates the DNA strands at the origin – B. Keeps the single-stranded DNA regions from coming back together – C. Re-coils the DNA into a helix after replication is complete – D. Breaks DNA backbone to remove tension produced by the helicase – E. Breaks hydrogen bonds between DNA and the RNA primers
  D. Topoisomerase breaks the DNA backbone to relieve supercoiling tension
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• What end overhangs?
  The 3' end of the telomere strand typically has a
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• What kind of cells need cell replication of their telomeres?
  Actively dividing cells, such as stem cells, germ cells, and
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• What percent of all human cancers have high levels of telomerase?
  Around 85–90% of human cancers have high telomerase activity. This
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