객관식
Although the number of genes in the human genome is surprisingly low compared to less complex organisms, the number of possible products from those genes is greatly amplified by __________.
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16. Regulation of Expression
Eukaryotic Post-Transcriptional Regulation
객관식
It is hypothesized that an increase in the number and diversity of noncoding RNA (ncRNA) in the genomes of species has driven the evolution of morphological complexity by way of their influence on gene regulation. Which of the following accurately represents our current understanding of the role that ncRNA is thought to play in gene regulation?
A
ncRNAs can fine-tune translation by binding with mRNA via complementary base pairing and promote the degradation of the mRNA strand or block its translation.
B
ncRNAs can re-establish proper patterns of DNA methylation in the genome during gamete formation.
C
Some ncRNA can promote the formation of heterochromatin, thereby blocking the expression of genes in the tightly coiled region.
D
Whereas some ncRNA block the transcription and translation of some genes, others have been observed to activate gene expression.
E
All of the listed responses are correct.
검증된 단계별 안내1
Understand the role of noncoding RNA (ncRNA) in gene regulation. ncRNAs are RNA molecules that are not translated into proteins but have roles in regulating gene expression.
Recognize that ncRNAs can bind to messenger RNA (mRNA) through complementary base pairing. This interaction can lead to the degradation of the mRNA or block its translation, thus fine-tuning the process of translation.
Acknowledge that ncRNAs are involved in the re-establishment of DNA methylation patterns during gamete formation. DNA methylation is a crucial epigenetic modification that affects gene expression.
Identify that some ncRNAs can promote the formation of heterochromatin, which is a tightly packed form of DNA. This can block the expression of genes located in these regions by making them inaccessible to the transcription machinery.
Understand that ncRNAs have diverse roles, including both blocking and activating gene expression. This dual functionality allows them to finely regulate gene expression in various contexts.
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