Which of the following processes allows Eukaryotes to produce multiple types of

Question

Which of the following processes allows Eukaryotes to produce multiple types of proteins from the same DNA coding sequence? A. Transcription of DNA into RNA B. Adding a poly-A tail to the RNA transcript C. Having the genes organized into operons D. Adding a 5' cap to the RNA transcript E. Splicing of the RNA transcript Neurons, kidney cells, and skin cells all contain the same genome: however, their respective proteomes (all the proteins found in a cell) vary drastically. This proteomes (all the proteins found in a cell) vary drastically. This observation is BEST explained by what phenomenon? A. Gene expression regulation B. Mitosis C. Crossing over D. Polygenetic variation E. Mutations Which of the following is false when comparing transcription between prokaryotes and eukaryotes? A. Prokaryotic mRNA has undergone multiple modifications before translation B. Eukaryotic genes have introns that need to be removed before translation C. Prokaryotic mRNA can be translated while it is still being transcribed D. Eukaryotic mRNA needs a S' cap and a 3' tail to prevent its degradation Which of the following statements about operons is FALSE? A. They contain multiple genes under the same promoter B. They are complex gene structures present in Eukaryotes C. All genes of the operon will be expressed at the same time D. They often have regulatory regions where regulatory proteins can bind E. They help make bacteria more efficient, by coordinated regulation of a group of genes that encode proteins with a common function When do you expect to see the highest level of expression of the Lac operon? A. When both, lactose and glucose are absent, so the cell has to make its own energy B. When lactose is present and glucose is not, so the cell has to use lactose for energy C. When both lactose and glucose are present, so the cell can choose which one to use D. When lactose is absent but glucose is present, so the cell can do lactic fermentation Why do prokaryotes not have transcription factors? A. This is incorrect, prokaryotes do have transcription factors B. In prokaryotes, genes are always being transcribed C. In prokaryotes, RNA polymerase doesn't need a promoter telling it where the gene is D. In prokaryotes, RNA polymerase can bind directly to the promoter region using the sigma subunit Post transcription regulation is far more common in Eukaryotes than in Prokaryotes. Which of the following does not explain this difference? A. In Prokaryotes, transcription occurs in the nucleus while translation happens in the cytoplasm. B. The RNA transcript in prokaryotes is already ready for translation C. In prokaryotes, translation is coupled with t n prokaryotes, translation is coupled with transcription. Thus, there is little time for post- transcription modifications D. In eukaryotes the RNA transcript can be spliced into multiple ways resulting in different peptide sequences

Explanation / Answer

17)- E is the correct answer that is splicing of the RNA transcript.
Alternative Splicing allows the different exons to be attached with each other and hence different proteins.
A is just normal transcription process so it's wrong
B and C prevents degradation of mrna, it has nothing to do with the expression of different proteins.
E is wrong because eukaryotes don't have operon system prokaryotes have.
18) A) Gene expression regulation is correct answer.
It decides which gene is to keep On and off, and depending on it the proteins are expressed in that cell.
B C D and E describes how the different individual is different but doesn't describe how different cells have different proteins despite of having the same chromosome.
19)
A is wrong that is prokaryotic mRNA has undergone multiple modifications before translation.
All other statements are correct.
20)
B is false that is operon s are present in eukaryotes.
All other options are true.

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