Answer: Portions called introns are removed and the remaining exons are spliced together
The messenger RNA obtained after transcription is known as primary transcribed RNA or precursor RNA, and it has to undergo modifications before exerting its function. This is called RNA processing or maturation.
In the DNA sequence, the coding content of a gene is not continuously distributed along the gene, but has discontinuities, called introns, whose sequence does not encode proteins. The parts of the sequence that encode proteins are called exons. Through a process called splicing (which is one of the modification that are part of the RNA maduration), the introns are eliminated and the exons are joined forming a mature messenger RNA molecule that will be used for protein synthesis.
So the exons are part of the region of a gene that is not separated during the cutting and splicing process and is therefore kept in the mature messenger RNA. Each exon codes a specific portion of the entire protein, so that the set of exons forms the coding region of the gene.
Many cacti, such as saguaros and barrel cacti, have large stems and no leaves. What function of leaves is taken on by the stems of such cacti? A. They produce food by photosynthesis.
B. They absorb water and nutrients from the soil.
C. They transport materials throughout the plant.
D. They store excess water.
Which of the following is true of weather but not of climate
The pattern of most hormone secretion is described as _______________.
This pattern often fits in with daily body rhythms or with the sleep and wake cycle.
For example, Cortisol hormone accumulates early in the day, reduces towards the afternoon, and rises towards the end of sleep and maximizes during the morning hours.
Thyroid stimulating hormone (TSH) rises to the maximum point during sleep and reaches its low point three hours after the individual wakes up.
Growth hormone (GH) levels rise 90 minutes after sleep begins.
The stimulus intensity that is detected half the time, on average, is called the _____ threshold. difference adaptation weber absolute