The Bonus Question

Silkworm silk is composed essentially of four amino-acids, glycine, alanine, serine, and tyrosine. The silk, fibroin, is produced from two lateral glands, and the two fibres are glued together with another protein called sericin. The fibres are approximately triangular of dimensions 0.01 mm on each side. A silkworm larva spins its cocoon of silk at the rate of 1 cm sec-1. The unit cell of fibroin has a length of 70 nm and contains two amino-acids, that means the average length of an amino-acid is 35 nm. The amino-acids can be considered as cylinders with a radius of 47 nm. How many amino-acids does the silkworm incorporate into each fibre per second?

verbenone isophorone trimethylcyclohexendione verbenone isophorone trimethylcyclohexendione

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