CORRECT AND ACCURATE ANSWERS NEEDED PLEASE!!! Part A How is the cap attached to

Question

CORRECT AND ACCURATE ANSWERS NEEDED PLEASE!!!

Part A
How is the cap attached to the 5 end of eukaryotic mRNAs?

   A.by a 5-3 phosphodiester bond
   B.by a 5-5 phosphodiester bond
   C.by an unusual 5-3 triphosphate linkage
   D.by an unusual 5-5 triphosphate linkage

Part B
Which set of events describing sex determination in Drosophila females is most accurate and listed in the order in which the events occur?
Which set of events describing sex determination in Drosophila females is most accurate and listed in the order in which the events occur?
   A) Activation of Sxl transcription at the PE promotor, 2) Default splicing of mRNA transcribed from the PL promotor 3) Repression of male-specific genes by DSX-F
   B) Production of functional TRA protein 2) Splicing of dsx mRNA 3) Repression of male-specific genes by DSX-M
   C) Production of functional TRA protein 2) Splicing of dsx mRNA 3) Repression of male-specific genes by DSX-F
   D) Activation of Sxl transcription at the PE promotor 2) Formation of sisterless protein homodimers 3) Repression of male-specific genes by DSX-F

Part C
Which of the following best describe(s) the function of the 5'mRNA cap?

Check all that apply.
   A.Termination of transcription
   B.To protect the transcript from degradation
   C.It provides a site for ribosome binding in the cytoplasm.
   D.To provide a binding site for poly(A) polymerase

Explanation / Answer

Answer Part-A) D. by an unusual 5-5 triphosphate linkage

Reason - In this case, the beta and gamma phosphate group of the nucleotide at the 5'end of the mRNA are removed and the gamma phosphate group of guanine is removed from its 5'end. during capping process, these phosphates are joined together to give rise to a capped guanine mRNA having guanine 5'-alpha phosphate-beta phosphate- alpha phosphate-5'mRNA.

Answer part-B) D.Activation of Sxl transcription at the PE promotor 2) Formation of sisterless protein homodimers 3) Repression of male-specific genes by DSX-F

Reason - As we know that the sisterless protein homodimers are required to repress the male specific genes via the downstream processing of DSX-F. and this process is initiated by the activation of Sxl transcription at the PE promoter.

Answer Part-C) Correct options are as following;

B.To protect the transcript from degradation
C.It provides a site for ribosome binding in the cytoplasm.

Reason - capping of 5'end of mRNA protect it from degradation by the enzyme as well as it helps in recruitment of the ribosome on the 5'end of mRNA.

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