DNA quiz
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How many different letters make up DNA's code?
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More questions about DNA
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What do most mutations in your DNA cause?
Answer: Nothing noticeable
Why: Even inside genes many mutations are silent, because most amino acids can be spelled by more than one codon.
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How many chromosomes are in your mature red blood cells?
Answer: 0
Why: That is why blood DNA tests read DNA from white blood cells, which keep their nucleus.
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In which decade was DNA first discovered?
Answer: 1860s
Why: Friedrich Miescher first isolated it from pus on used surgical bandages and called it nuclein.
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Whose DNA can standard forensic tests not tell apart?
Answer: Identical twins
Why: Fraternal twins grow from two separate eggs and sperm, so their DNA differs as much as any other siblings'.
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How long would reading a human genome take at one letter a second?
Answer: About 100 years
Why: A human genome holds about 3 billion letters, while a year has only about 31.6 million seconds.
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About how much of your DNA comes from ancient viruses?
Answer: About 8%
Why: One of those old viral genes, syncytin, now helps build the human placenta.
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