Same chapter3 marksDifficulty: Medium
What is the lac operon, and how is it regulated?
Molecular Basis of Inheritance
3 marksDifficulty: Medium
What was the Human Genome Project and state two of its findings.
Original Khojo Papers practice question — not from a past board paper.
Answer
The Human Genome Project, completed in 2003, set out to sequence all the bases in the human genome and to identify its genes. It found that the genome contains about 3.1 billion base pairs but only about 20,000 to 25,000 genes, far fewer than expected, and that less than 2% of it codes for protein while much of the rest is repetitive sequence.
No citable source has been recorded for this record. Treat it as practice material, not as fact.
Explanation
It also found that any two people are more than 99.9% identical in their DNA.
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State three features of the Watson-Crick model of DNA.
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Why is DNA replication described as semi-conservative, and whose experiment proved it?
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Describe the structure and functions of the placenta.
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