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It was established in the 1700's
The correct answer is: b. It is free to bind to another promoter and begin transcription
Transcription is the first step of gene expression in which DNA molecule is copied (transcribed) into RNA (mRNA) by RNA polymerase. The process of transcription is divided into three phases:
1. Initiation
• RNA polymerase with transcriptional factors bind to gene promoter
• RNA polymerase unwinds DNA double helix (transcription bubble is formed)
2. Elongation
• RNA polymerases adds nucleotides complementary to DNA
3. Termination
• RNA polymerase gets to stop codon (transcribes a sequence of DNA known as a terminator)
• Formed complementary RNA strand is released from DNA-RNA complex.
RNA polymerase is also released and can transcribe some other gene by binding to its promotor. RNA polymerase will transcribe just the genes whose products are needed at a particular moment.
Answer: fMRI
Explanation:
fMRI or functional magnetic resonance imaging is an imaging technique in which the brain activity can be monitored by observing the changes in the blood flow. The blood flow can be detected due to the presence of iron containing heme group present in the hemoglobin of the brain. The iron components are utilized to determine the magnetic property which further helps in diagnosis of the functional anatomy, stroke, diseases and abnormalities in the brain. This technique also helps in brain treatment.
