In eukaryotes, exons are sequences that are A. Uitgesny word uit die mRNA voor transkripsie / Excised from the mRNA prior to transcription B. Getransleer word na proteïene / Translated into proteins C. Getranskribeer word maar nie getransleer nie / Transcribed but not translated D. Nie een van bogenoemde nie / None of the above

In eukaryotic cells, sequences of mRNA removed before translation are called

The same pre-mRNA transcript can be alternatively spliced to produce two different forms of an antibody protein; either the formthat is anchored in the cell membrane before an infection or the form that is secreted from the B-cell during an infection.The antibody gene contains 8 exons. The functions of the various exons encoded by the antibody transcript are listed below Exon1 – encodes a signal peptide, this peptide is removed after translation. This signal peptide helps direct the antibodyprotein from the rough ER (where it is made) to the Golgi apparatus. Exon 2 – codes for a part of the antibody protein that recognizes a particular antigen Exons 3 – 6 encode the constant region of the antibody. This is the part of the antibody that is the same in differentantibodies recognizing different pathogens. Exons 7 – 8 – encode a transmembrane region of the protein that anchors the antibody in the B-cell membrane.For the antibody mRNA, use the following colors to represent the various exons: Exon 1 – Red Exon 2 – Orange Exon 3 – Yellow Exon 4 – Green Exon 5 – Blue Exon 6 – Purple Exon 7 – Pink Exon 8 – Black1) Draw and title the complete pre-mRNA strand as it would have been transcribed from the antibody gene. Draw introns andexon boxes as large or as small as you would like, however please be sure to separate each exon with an intron and rememberthat introns are usually much larger than exons. Please use the correct color for each exon. Then, provide a description of thefunction of each exon in the antibody transcript.2) Pretend you are a spliceosome and construct the mRNAs described below by removing the introns and exons that will not beincluded.a) mRNA 1: In resting B-cells the antibody mRNA contains all 8 exons. Using the correct colors, draw a diagram representingthis mRNA. Be sure to give you diagram a title. Then, answer the following questions in complete sentences:i) What is the function of the protein produced from mRNA 1?ii) In what type of cell and when is this mRNA generated?b) mRNA 2: Once the B-cell has bound an antigen, it wants secrete antibodies against that antigen. Now the transcript isspliced so that only exons 1-6 are included. Using the correct colors, draw a diagram representing this mRNA. Be sure togive you diagram a title. Then, answer the following questions in complete sentences:i) What is the function of the protein produced from mRNA 2?ii) In what type of cell and when is this mRNA generated?

Which component of transcribed RNA in eukaryotes is present in the initial transcript but isremoved before translation occurs:

Prokaryotes and eukaryotes differ in how they accomplish transcription and translation. Which of the following are unique to prokaryotic cells?SELECT ALL THAT APPLYMessenger RNA must travel out of the nucleus to reach a ribosome for translation.Uses a lot of cellular energy.Transcription occurs in the cytoplasm.RNA must be spliced after it is transcribed before it can be translated.Main enzyme is RNA polymerase.Translation of an RNA sequence can begin before transcription is complete.

Eukaryotic transcription is carried out by