Molecular Biology: How Bacterial Immunity Became Gene Editing
From the double helix to PCR and CRISPR, how cells copy, read and control their genes, and how we learned to do it too.
Molecular Biology · 50 questions
Try 3 questions
1. A double-stranded DNA sample is 30 percent adenine. What percentage is guanine?
- 30 percent
- 40 percent
- 20 percent
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Answer: 20 percent
A pairs with T and G with C, so A+T is 60% and the remaining 40% splits evenly between G and C.
2. Rosalind Franklin's X-ray image known as 'Photo 51' was crucial evidence for what?
- The three-letter codon
- Mendel's laws of heredity
- DNA's helical structure
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Answer: DNA's helical structure
The X-shaped diffraction pattern revealed a helix and its dimensions, which Watson and Crick used to build their model.
3. If the DNA in a single human cell were stretched out end to end, about how long would it be?
- About 2 millimeters
- About 2 kilometers
- About 2 meters long
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Answer: About 2 meters long
Six billion base pairs at about 0.34 nanometers each add up to roughly two meters, packed into a nucleus a few micrometers wide.
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