A student wrote these statements about polysaccharides.
1) Amylose is formed from condensation reactions between $\beta - $glucose monomers.
2) Branches in amylopectin molecules form between carbon atoms 1 and 4 on $\alpha - $glucose molecules.
3) In unbranched $\beta - $glucose chains, each monomer is rotated ${180^ \circ }$ relative to its adjacent monomer.
Which of these statements are correct?
1 )
1 and 2
2 )
1 only
3 )
2 and 3
3 only
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