DP Biology (first assessment 2025)

Question 19M.1A.HL.TZ2.14

Date	May 2019	Marks available	[Maximum mark: 1]	Reference code	19M.1A.HL.TZ2.14
Level	HL	Paper	1A	Time zone	TZ2
Command term	Deduce	Question number	14	Adapted from	N/A

14.

[Maximum mark: 1]

19M.1A.HL.TZ2.14

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

[1]

Markscheme

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

D. Continuity and Change » D1.2. Protein synthesis » D1.2.13. Initiation of transcription at the promoter

D. Continuity and Change » D1.2. Protein synthesis » D1.2.14. Non-coding sequences in DNA do not code for polypeptides

D. Continuity and Change » D1.2. Protein synthesis » D1.2.15. Post-transcriptional modification in eukaryotic cells

Question 19M.1A.HL.TZ2.14

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