Question

—rRNA is processed by splicing

A. True

B. False

—A mRNA that contains an ARE sequence it is more stable than a mRNA without an ARE sequence.

A. True

B. False

— Which of the following describes group I introns?

A. They are self-splicing.

B. Splicing requires a free guanosine

C. The 3D structure of the intron is important for intron function.

D. Group 1 introns are small only 120-450 nt long

E. All of the above describe group 1 introns

Which of the following statements about snoRNAs is false?

A. snoRNAs are involved in editing bases in tRNAs

B. snoRNAs are often made from introns of mRNAs

C. snoRNAs are used in both eukaryotic and prokaryotic tRNA processing

D. snoRNAs require protein complexes to help them complete their editing function.

PLEASE HELP

Answer 1

1.

Splicing is the process of removal of introns and joining of exons. It occurs to tRNA,mRNA,rRNA. The statement is True, rRNA is processed by splicing.

True

2.

Adenylate- uridylate -rich elements (AU rich elements, ARE) are seen on the 3' untranslated region of mRNAs. They target the mRNA for rapid degradation.

So the satement is False. The mRNA that contain an ARE sequence is not more stable than mRNA without an ARE.

False.

3.

Here are some statements sbout group 1 introns

- They are self splicing . it is true, they are self spicing ribozymes .They catalyse their own excision from RNA precursors.

- Group 1 intron splicing requires free guanosine , This is true.

- `The 3 D structure of the intron is important for intron function in group 1 intron splicing. It is true.

- Group 1 introns are small only 120-450 nt long . It is also correct.

All the satements are true about group 1 introns.

option E is the correct answer.

4.

4 statements are about snoRNAS

- snoRNAs are involved in editing bases in tRNAS.This is true.

- snoRNAs are often made after splicing, trimming, debranching of mRNA introns. So the statement is correct that snoRNAs are made from introns of mRNAs.

- snoRNAs are used in both eukaryotic and prokaryotic tRNAprocessing. This is false. They are not at all used.

- Mature snoRNAs associate with proteins to form small nucleolar ribonucleoproteins /snoRNPs. So the satement is true. snoRNAs require protein complexes to help them in editing function.

Option C is False.

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