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Date May 2019 Marks available 1 Reference code 19M.1.HL.TZ2.14
Level Higher level Paper Paper 1 Time zone Time zone 2
Command term Deduce Question number 14 Adapted from N/A

Question

What applies to DNA base sequences?

I. Some genes do not code for proteins.

II. Promoters are transcribed along with the gene.

III. Introns are only found within genes coding for proteins.

A. I only

B. II only

C. II and III only

D. I, II and III

Markscheme

B

Examiners report

From Topic 7.1 candidates should know that introns are regions of DNA that do not code for proteins. This confused some candidates that failed to realize that introns are found within genes coding for proteins. In order to make this question more fair, the mark scheme was adapted and answers A and B were both accepted as correct.

Syllabus sections

Additional higher level » Topic 7: Nucleic acids » 7.1 DNA structure and replication
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Additional higher level » Topic 7: Nucleic acids
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