List the main steps involved in converting pre-mRNA to mRNA. Explain the purpose of each step. What will be an ideal response?
1) Addition of a 5’cap: allows ribosome binding to mRNA and may protect mRNA
transcripts from degradation.
2) Addition of a poly-A tail: aids in the export of the mRNA trancript from the nucleus;
protects mRNA transcripts from degradation; allows ribosome to recognize mRNA for
translation.
3) Removal of introns: removes noncoding sequences.
4) Splicing of exons: joins consecutive coding regions (exons) after the removal of
intervening introns.
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A deficiency in a plant micronutrient
A. is less serious than a deficiency in a macronutrient. B. makes that plant susceptible to herbivores. C. can have a severe effect on plant growth. D. results in no visible symptoms. E. has no impact on the agriculture of a region.
Carriers of Hepatitis B virus are not common.
Answer the following statement true (T) or false (F)
Four of the five factors listed below affect the rate of
an enzymatic reaction. Select the exception. a. pH b. temperature c. concentration d. built-up product e. size of enzymes
What was the transforming principle isolated in Griffith's experiment?
A) Protein B) RNA C) DNA D) Virus E) Polysaccharide