GENETICS AND EVOLUTION
MOLECULAR BASIS OF INHERITANCE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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DNA-replication
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transcription
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translation
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none of the above.
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Detailed explanation-1: -Transcription is the correct answer.
Detailed explanation-2: -Specifically, gene expression is controlled on two levels. First, transcription is controlled by limiting the amount of mRNA that is produced from a particular gene. The second level of control is through post-transcriptional events that regulate the translation of mRNA into proteins.
Detailed explanation-3: -Gene expression is primarily controlled at the level of transcription, largely as a result of binding of proteins to specific sites on DNA.
Detailed explanation-4: -Transcription factors are proteins that help turn specific genes “on” or “off” by binding to nearby DNA. Transcription factors that are activators boost a gene’s transcription. Repressors decrease transcription.
Detailed explanation-5: -Once the RNA has reached the cytoplasm, there is still no guarantee that it will be translated. The control of gene expression at the level of translation can occur by many means; some of the most important of these are described below.