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Question 18M.2.HL.TZ2.4a

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Date May 2018 Marks available [Maximum mark: 3] Reference code 18M.2.HL.TZ2.4a
Level HL Paper 2 Time zone TZ2
Command term Explain Question number a Adapted from N/A
a.
[Maximum mark: 3]
18M.2.HL.TZ2.4a
(a)

The diagram shows alpha amylase.

Explain the secondary structure of this protein molecule.

[3]

Markscheme

a. secondary structure includes alpha helices/beta pleated sheets 

b. secondary structure «of this protein» consists «mainly» of alpha helices 

c. spiral coils «of polypeptide chain» held together by hydrogen bonds 

d. between oxygen «C=O» and hydrogen atoms «N−H» of amino acids«on backbone» 

e. «some» beta pleated sheets present in this protein

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