AP Biology Unit 6 practice questions: Gene Expression and Regulation
8 original multiple-choice questions on AP Bio Unit 6, gene expression and regulation. Answer each one in your browser and read the explanation, then review the key ideas below.
Question 1 of 8
In eukaryotes, transcription
Question 2 of 8
In the lac operon, when lactose is present
Question 3 of 8
A base substitution changes a codon from GAA to GAG, and both code for glutamic acid. This is a
Question 4 of 8
Which enzyme joins Okazaki fragments on the lagging strand?
Question 5 of 8
A frameshift mutation is caused by
Question 6 of 8
Where does translation take place?
Question 7 of 8
An mRNA codon is 5′-AUG-3′. What is the matching tRNA anticodon (written 3′ to 5′)?
Question 8 of 8
In gel electrophoresis, which DNA fragments travel farthest from the wells?
Key ideas in Unit 6
- DNA replication is semiconservative; helicase, DNA polymerase, primase and ligase each have a job, and the lagging strand is made in Okazaki fragments.
- Transcription makes mRNA in the nucleus; eukaryotic mRNA is processed with a cap, a poly-A tail and splicing.
- Translation at ribosomes reads codons, with tRNA anticodons bringing the matching amino acids.
- Gene regulation: operons like lac in bacteria, and transcription factors and epigenetics in eukaryotes.
- Mutations can be silent, missense, nonsense or frameshift. Biotechnology tools include PCR, gel electrophoresis and restriction enzymes.
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