Mock Exam IB DP Biology HL Paper 2 Set 8

Question

(a) (i) Label a peptide bond in the diagram of a polypeptide.

(ii) Outline the primary structure of proteins.

(b) Identify two hydrolysis reactions that occur in the small intestine.

Answer/Explanation

Ans:  a (i)

a (ii) number/sequence/order of amino acids «in a protein/polypeptide chain»

b)

a. polysaccharides to disaccharides/monosaccharides

OR

starch/glycogen to maltose 

b. sucrose to glucose AND fructose 

c. maltose to glucose 

d. lactose to glucose AND galactose 

e. proteins/peptides/polypeptides to shorter peptides/amino acids

OR

dipeptides to amino acids 

 

Question

(a) State one similarity and one difference between the structure of genes and short tandem repeats.

Similarity:

Difference:

(b) Outline the role of short tandem repeats in DNA profiling.

Answer/Explanation

Ans:  

a)

similarity: both made of DNA/nucleotides

OR

both have bases/adenine/cytosine/guanine/thymine

OR

neither has uracil  

difference: genes are longer/have longer DNA/base sequences «without repeats»

OR

genes have introns/exons but tandem repeats do not

OR

genes have base sequences that code for polypeptides/proteins and tandem repeats do not 

b)

a. tandem repeats allow individuals to be distinguished/compared/identified OR tandem repeats are used to identify the source of a DNA sample   

b. unique/different number of repeats/combination of tandem repeats in each individual OR unique/different pattern of bands in each individual 

c. PCR used for copying/amplifying «tandem repeats» 

d. gel electrophoresis used for separation «of tandem repeats»/create pattern of bands

 
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