Silk moth caterpillars have been genetically modified to produce a mixture of their own silk and the much stronger spider silk of the golden orb web spider.
The spider silk polypeptide chain has many repeated sequences of two amino acids, glycine and alanine, arranged in a crystalline structure.
What correctly describes the structure of spider silk?
1 )
primary protein structure with regions of α-helices
secondary protein structure with regions of β-pleated sheets
3 )
tertiary protein structure with regions of α-helices
4 )
quaternary protein structure with regions of β-pleated sheets
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