Anonymous
06-04-2004, 10:05 PM
Which of the following is NOT a feature of eukaryotic gene expression?
A. polycistronic mRNAs are very rare
B. many genes are interrupted by non-coding DNA sequences
C. RNA synthesis and protein synthesis are coupled as in prokaryotes
D. mRNA is often extensively modified before translation
E. multiple copies of nuclear genes, and pseudo genes can occur
The primary distinctions between Prokaryotic vs Eukaryotic Gene Expression are as follows:
A. Eukaryotes are multi-cellular. Gene expression can be development and tissue specific.
B. There are multiple copies for many eukaryotic genes, and a large amount of non-essential DNA.
C. Eukaryotic genes are primarily in the nucleus. mRNAs must cross the nuclear membrane before they are translated in cytoplasm.
D. Many eukaryotic genes are interrupted by non-coding DNA, which is transcribed and then removed by a process known as splicing.
E. Eukaryotic precursor mRNA is extensively modified in the nucleus before translation.
F. Transcription and translation not coupled as in prokaryotes
G. Polycistronic mRNAs rare in eukaryotes.
ans:
C. RNA synthesis and protein synthesis are coupled as in prokaryotes
RNA synthesis occurs in the nucleus, but translation occurs on ribosomes in the cytoplasm. Transcription and translation are spatially and temporally separated in eukaryotic cells.
A. polycistronic mRNAs are very rare
B. many genes are interrupted by non-coding DNA sequences
C. RNA synthesis and protein synthesis are coupled as in prokaryotes
D. mRNA is often extensively modified before translation
E. multiple copies of nuclear genes, and pseudo genes can occur
The primary distinctions between Prokaryotic vs Eukaryotic Gene Expression are as follows:
A. Eukaryotes are multi-cellular. Gene expression can be development and tissue specific.
B. There are multiple copies for many eukaryotic genes, and a large amount of non-essential DNA.
C. Eukaryotic genes are primarily in the nucleus. mRNAs must cross the nuclear membrane before they are translated in cytoplasm.
D. Many eukaryotic genes are interrupted by non-coding DNA, which is transcribed and then removed by a process known as splicing.
E. Eukaryotic precursor mRNA is extensively modified in the nucleus before translation.
F. Transcription and translation not coupled as in prokaryotes
G. Polycistronic mRNAs rare in eukaryotes.
ans:
C. RNA synthesis and protein synthesis are coupled as in prokaryotes
RNA synthesis occurs in the nucleus, but translation occurs on ribosomes in the cytoplasm. Transcription and translation are spatially and temporally separated in eukaryotic cells.