Nucleic Acids (AHL)
Each subtopic includes About section, revision page link, 10 preview questions, and practice CTAs.
DNA structure and replication
SubtopicDNA structure and replication under Nucleic Acids (AHL) for Grade 12 IB.
Preview questions (no answers)
- 1.
DNA is described as being 'antiparallel'. What does this term specifically refer to?
A.The two strands rotate in opposite directions to form a helix.
B.One strand runs in a to direction, while the other runs to .
C.Adenine always pairs with Thymine, and Cytosine always pairs with Guanine.
D.The sugar-phosphate backbone is on the outside of the molecule.
- 2.
In the structure of a nucleosome, the DNA is wrapped around a core consisting of which protein?
A.Actin
B.Histone
C.Tubulin
D.Topoisomerase
- 3.
Which enzyme is responsible for breaking the hydrogen bonds between the nitrogenous bases to separate the DNA strands during replication?
A.DNA Ligase
B.DNA Polymerase I
C.DNA Primase
D.Helicase
Download the worksheet for Nucleic Acids (AHL) - DNA structure and replication to practice offline. It includes additional chapter-level practice questions.
Transcription and gene expression
SubtopicTranscription and gene expression under Nucleic Acids (AHL) for Grade 12 IB.
Preview questions (no answers)
- 1.
Which process is represented by the step labeled 'B' in the simplified pathway of gene expression shown below?
A.Translation
B.DNA Replication
C.RNA Splicing
D.Transcription
- 2.
Which of the following describes the non-coding sequences of DNA that are removed from the primary transcript during splicing?
A.Exons
B.Codons
C.Introns
D.Promoters
- 3.
What is the primary function of the promoter region in a eukaryotic gene?
A.To signal the end of the transcription process
B.To provide a binding site for RNA polymerase to initiate transcription
C.To code for the first few amino acids of a polypeptide
D.To protect the from degradation by nucleases
Download the worksheet for Nucleic Acids (AHL) - Transcription and gene expression to practice offline. It includes additional chapter-level practice questions.
Preview questions (no answers)
- 1.
What are the two primary chemical components that make up a ribosome?
A.DNA and carbohydrates
B.mRNA and lipids
C.rRNA and proteins
D.tRNA and DNA
- 2.
In which part of a eukaryotic cell does the translation of mRNA into a polypeptide primarily take place?
A.Nucleus
B.Ribosomes
C.Nucleolus
D.Lysosomes
- 3.
Which molecule is responsible for transporting specific amino acids to the ribosome during the process of translation?
A.mRNA
B.rRNA
C.snRNA
D.tRNA
Download the worksheet for Nucleic Acids (AHL) - Translation to practice offline. It includes additional chapter-level practice questions.