IB Biology Topic 7.2 MCQ's

The sequence of nucleotides in a section of RNA is: GCCAUACGAUCG What is the base sequence of the DNA sense strand? A. CGGUAUGCUAGC B. GCCATACGATCG C. CGGTATGCTAGC D. GCCAUACGAUCG

B

What is removed during the formation of mature RNA in eukaryotes? A. Exons B. Introns C. Codons D. Nucleosomes

B

What makes up eukaryotic RNA immediately after transcription? A. Exons, introns and primers B. Exons and introns C. Introns only D. Exons only

B

Which structure found in eukaryotes has a single membrane? A. Nucleus B. Lysosome C. Chloroplast D. Mitochondrion

B

What happens during transcription in eukaryotes? A. Polysomes move. B. Nucleosomes are phosphorylated. C. RNA polymerase separates DNA strands. D. Okazaki fragments are produced.

C

What is a feature of transcription? A. Both strands of a DNA molecule act as a template for mRNA. B. Nucleoside triphosphates become nucleotides by losing three phosphates. C. RNA polymerase binds to the promoter region. D. The sense strand acts as a template for mRNA.

C

The antisense strand on the DNA molecule coding for three codons of a gene is TATCGCACG What are the anticodons of the three tRNA molecules that correspond to this sequence? A. UAU, CGC and ACG B. ATA, GCG and TGC C. AUA, GCG and UGC D. TAT, CGC and ACG

A

What are introns? A. Sequences of nucleotides that are removed to form mature RNA in eukaryotes B. Sequences of nucleotides that are removed to form mature RNA in prokaryotes C. Sequences that remain in mature RNA after exons have been removed D. Small pieces of circular DNA that are found in prokaryotes

A

In which process(es) do nucleosomes play a role in eukaryotes? I. tRNA activation II. Transcription regulation III. DNA supercoiling A. I only B. II only C. II and III only D. I, II and III

C

Some regions of DNA do not code for the production of proteins. What are these regions of DNA used as? A. They have no known function and are recycled to provide nucleotides B. Gene regulation and coding for production of enzymes used in translation C. Telomeres and coding for production of tRNA D. Introns and coding for production of structural proteins

C

Which statement applies to transcription in eukaryotic cells but not to prokaryotic cells? A. RNA polymerase transcribes the antisense strand of DNA to produce a strand of RNA. B. During transcription, uracil replaces thymine in RNA. C. Transcription takes place in the cell nucleus. D. Initiation of transcription requires a promoter sequence of DNA.

C

The antisense strand of a DNA molecule has the sequence TACCCGATC. What would be the resulting mRNA strand sequence? A. TACCCGATC B. ATGGGCTAG C. UACCCGAUC D. AUGGGCUAG

D