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Cell and Molecular Biology

Cell and Molecular Biology

Plaipol Dedvis
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วิทยาศาสตร์

Cell and Molecular Biology

Plaipol Dedvis

134

19 ข้อ

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Cell and Molecular Biology Lecture_organized.pdf
# 1
Which of the following statements best describes a key difference in translation initiation between bacterial and eukaryotic cells?
Bacterial cells use a 5' cap to initiate translation, while eukaryotic cells use a Shine-Dalgarno sequence.
Bacterial cells use a Shine-Dalgarno sequence to direct ribosomes to the start codon, while eukaryotic cells use a 5' cap and scanning mechanism.
Eukaryotic cells require initiation factors (IFs) while bacteria do not
The start codon in bacteria is typically methionine, while in eukaryotes it is formylmethionine.
# 2
Which of the following statements best describes the attenuation process of the trp operon at high tryptophan concentrations?
The ribosome stalls at the leader sequence, allowing transcription of the entire operon.
The trp repressor binds to the operator, blocking transcription.
The leader sequence forms a terminator loop, preventing transcription of the structural genes.
Attenuation does not occur at high tryptophan concentrations.
# 3
Which histone modification typically increases gene expression?
Deacetylation
Phosphorylation
Acetylation
Methylation
# 4
During transcription, RNA polymerase synthesizes RNA in the:
5' → 3' direction using the 3' → 5' DNA template strand
3' → 5' direction using the 5' → 3' DNA template strand
5' → 3' direction using the 5' → 3' DNA template strand
3' → 5' direction using the 3' → 5' DNA template strand
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