Using Molecular Evidence in Classification (OCR A-Level Biology A): Quizzes

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Using Molecular Evidence in Classification
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What molecular sequences does molecular phylogeny use to determine evolutionary relationships?

Amino acids in proteins & nucleotides in DNA

In antibody-based comparison, what does higher precipitation indicate?

Greater similarity between proteins

Why is cytochrome c particularly useful for comparing species?

Conserved structure across diverse species

In DNA hybridisation, what does requiring more heat to separate strands indicate?

Closer genetic match between species

Why can DNA sequencing reveal differences that protein sequencing cannot?

Genetic code is degenerate

What are silent mutations?

Changes producing same amino acid

Which genes are most useful for determining relationships between domains and kingdoms?

Slowly changing genes like rRNA

What characteristic makes mitochondrial DNA useful for studying closely related organisms?

Higher mutation rate

What is the primary purpose of gene barcoding?

Species identification from DNA sequences

What unexpected relationship did molecular evidence reveal?

Fungi closer to animals than plants

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