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
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Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple 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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