Molecular Cell Biology
Molecular Cell Biology
8th Edition
ISBN: 9781464183393
Author: Harvey Lodish, Arnold Berk, Chris A. Kaiser, Monty Krieger, Anthony Bretscher, Hidde Ploegh, Angelika Amon, Kelsey C. Martin
Publisher: W. H. Freeman
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Chapter 8, Problem 1RTC
Summary Introduction

To analyze:

The definition of genes and state whether they are continuous, simple or complex transcription units for eukaryotes, continuous introns and those capable of making only single proteins from a given gene.

Introduction:

Gene is the basic unit of DNA or chromatin material that contains information about the synthesis of proteins inside a cell. It is also called the hereditary unit of a cell as it helps to transfer characters from parents to offspring.

Expert Solution & Answer
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Explanation of Solution

Gene is the DNA sequence required for the transcription of a functional mRNA is called a gene. It is the hereditary unit of a cell as it is responsible for the transfer of characters from parents to offspring.

Eukaryotes have both simple and complex types of transcriptional units. Simple transcription units are the ones that transcribe for a single type of mRNA, which translates for a single protein. Complex transcription units can produce more than one type of mRNA and therefore more than one type of proteins.

Both simple and complex transcription units can have introns. The only difference is that simple transcription units produce a single protein and all the introns are spliced out while the complex transcriptional units can produce more than one type of mRNA as a result of alternative splicing.

Continuous genes do not have any introns and therefore are capable of a single protein from a given gene.

Conclusion

Genes are the sequence of DNA that is required for producing a functional mRNA. The continuous transcriptional unit does not have any introns and produces a single mRNA. Introns are non-coding sequences that are present in an mRNA that is removed during splicing. Simple transcription units produce a single mRNA by removal of introns while complex transcriptional units can produce more than one types of mRNA by alternative splicing.

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QCE Biology: Introduction to Gene Expression; Author: Atomi;https://www.youtube.com/watch?v=a7hydUtCIJk;License: Standard YouTube License, CC-BY