Chloramphenicol binds to the 50S portion of a ribosome, which will interfere with:
a. Transcription in prokaryotic cells
b. Transcription in eukaryotic cells
c. Translation in prokaryotic cells
d. Translation in eukaryotic cells
e. DNA synthesis

검증된 단계별 안내

Step 1: Understand the role of the ribosome in the cell. Ribosomes are the molecular machines responsible for protein synthesis, a process called translation, where mRNA is decoded to build proteins.

Step 2: Recognize the difference between the two main subunits of ribosomes: the 30S and 50S subunits in prokaryotes, and the 40S and 60S subunits in eukaryotes. Chloramphenicol specifically binds to the 50S subunit, which is part of the prokaryotic ribosome.

Step 3: Recall that transcription is the process of synthesizing RNA from DNA, which occurs in the nucleus and involves RNA polymerase, not ribosomes. Therefore, binding to the 50S ribosomal subunit does not affect transcription.

Step 4: Since chloramphenicol binds to the 50S subunit of prokaryotic ribosomes, it interferes with translation (protein synthesis) in prokaryotic cells, not eukaryotic cells.

Step 5: Conclude that the correct interference caused by chloramphenicol is with translation in prokaryotic cells, corresponding to option c.

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주요 개념

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Ribosome Structure and Function

Ribosomes are cellular machines responsible for protein synthesis, composed of two subunits: the small (30S in prokaryotes, 40S in eukaryotes) and the large (50S in prokaryotes, 60S in eukaryotes). The 50S subunit in prokaryotes plays a key role in forming peptide bonds during translation, making it a target for certain antibiotics.

Mechanism of Action of Chloramphenicol

Chloramphenicol is an antibiotic that binds specifically to the 50S ribosomal subunit in prokaryotes, inhibiting the peptidyl transferase activity. This prevents peptide bond formation, thereby blocking translation and protein synthesis in bacterial cells without affecting eukaryotic ribosomes.

Difference Between Transcription and Translation

Transcription is the process of copying DNA into RNA, while translation is the synthesis of proteins from mRNA by ribosomes. Chloramphenicol affects translation by targeting ribosomes, not transcription or DNA synthesis, which are separate cellular processes.

Chloramphenicol binds to the 50S portion of a ribosome, which will interfere with:a. Transcription in prokaryotic cellsb. Transcription in eukaryotic cellsc. Translation in prokaryotic cellsd. Translation in eukaryotic cellse. DNA synthesis