What is lactose tolerance / intolerance?

This gene on chromosome 2 codes for the enzyme lactase. This enzyme enables infants to break down lactose, the main sugar in milk. In people who are lactose tolerant, the gene remains active throughout their lives. In most people who are lactose intolerant, the gene is turned off after infancy, making the digestion of dairy products difficult and painful.

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  • ID: 15953
  • Source: DNALC.DNAi

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  • Source: DNAi

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Jacques Monod and François Jacob work with how bacteria breaks large sugars into smaller pieces.

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  • Source: DNALC.DNAFTB

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François Jacob talks about how enzyme production was viewed at the time they were beginning their experiments.

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Restriction enzymes can bind to and cut DNA at specific sites.

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  • Source: DNAi

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  • Source: DNALC.DNAFTB

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François Jacob talks about designing bacteria.

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  • Source: DNAi

15253. Discovering the lac operon, Walter Gilbert

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  • Source: DNAi

16703. Problem 33: Genes can be turned on and off.

Learn more about the lac operon system.

  • ID: 16703
  • Source: DNALC.DNAFTB