Exam (elaborations)
INTRONS + EXTRON TEST QUESTIONS AND ANSWERS
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INTRONS + EXTRON TEST QUESTIONS AND ANSWERS...
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How many genes does a human nucleus contain? - ANSWER 25,000Different cells can express ______ _______ depending on the needs of the cell -
ANSWER Different genes
What does pre-mRNA contain? - ANSWER introns and exons
What don't we need in pre-mRNA? - ANSWER Introns
What do we need in pre-mRNA? - ANSWER Exons
How are excess introns removed from the mRNA transcript? - ANSWER They
are spliced out of the RNA using endonucleases called spliceosomes
What is the process known as when introns are spliced out of pre-mRNA? -
ANSWER RNA splicing
After excess introns have been spliced out of pre-mRNA, how are the exons
reassembled? - ANSWER They are spliced back together using ligases
Explain how there are only 25,000 genes but aproximately 90,000 proteins able
to be synthesised from the human genome? - ANSWER Different cells can code
for different forms of mRNA by combiningor removing different exons to
produce similar proteins
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