Textbook Question
In general, __________ operons are inactive until the substrate of their genes’ polypeptides is present.
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15. Central Dogma & Gene Regulation
Prokaryotic Gene Regulation via Operons
Multiple Choice
Which of the following features is present in prokaryotic translation but not in eukaryotic translation?
A
Transport of mRNA out of the nucleus
B
Splicing of introns
C
Polycistronic mRNA
D
5' cap-dependent ribosome binding
Verified step by step guidance1
Step 1: Understand the key differences between prokaryotic and eukaryotic translation processes, focusing on mRNA structure and ribosome binding mechanisms.
Step 2: Recall that prokaryotic mRNA is often polycistronic, meaning a single mRNA molecule can encode multiple proteins, whereas eukaryotic mRNA is typically monocistronic, encoding only one protein per mRNA.
Step 3: Recognize that transport of mRNA out of the nucleus and splicing of introns are features unique to eukaryotic cells because prokaryotes lack a nucleus and generally do not have introns.
Step 4: Note that eukaryotic translation initiation usually requires a 5' cap on the mRNA for ribosome binding, while prokaryotic translation initiation involves ribosome binding to specific sequences called Shine-Dalgarno sequences, not a 5' cap.
Step 5: Conclude that the presence of polycistronic mRNA is a distinctive feature of prokaryotic translation not found in eukaryotic translation.
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