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Biology: The Unity and Diversity o...

14th Edition
Cecie Starr + 3 others
Publisher: Cengage Learning
ISBN: 9781305073951

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Chapter
Section
BuyFindarrow_forward

Biology: The Unity and Diversity o...

14th Edition
Cecie Starr + 3 others
Publisher: Cengage Learning
ISBN: 9781305073951
Chapter 10, Problem 5SQ
Textbook Problem
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In eukaryotes, control over gene expression occurs at the level of _______.

  • a. transcription
  • b. RNA processing
  • c. RNA transport
  • d. mRNA degradation
  • e. translation
  • f. protein modification
  • g. a through e
  • h. all of the above

Summary Introduction

Introduction: Genes are the fundamental unit of heredity which is composed of DNA. Each gene specifies a particular protein. For this, the genes will be converted into a useful product through the process of gene expression. Gene expression involves the conversion of DNA into RNA through the process of transcription and this RNA will be converted into proteins through the process of translation.

Explanation of Solution

Reason for the correct answer:

Transcription is the process in which the nucleotide sequences of a gene are transcribed into mRNA sequences, which code for the proteins. This marks the beginning of gene expression. After transcription, pre-mRNA is synthesized and further modified before the translation in the cytoplasm. This is called RNA processing and it includes modification of mRNA ends and RNA splicing. The RNA transport involves the transport of the RNA molecules from one site to another inside the cell.

After the translation process, the mRNA degrades inside the cells. The mRNA degradation is the main part in the regulation of the expression of genes. The polypeptide chain is synthesized on the basis of amino acid sequences in the reading frame. This process is known as translation. In eukaryotes, transcription occurs in nucleus and mRNA leaves the nucleus after the post-transcriptional modifications. These mRNA triplet nucleotides are translated into polypeptide chains which code for the specific proteins and enzymes.

Option h. is given as “all of the above”.

The given option involves the control of the gene expression in the eukaryotes.

Hence, the correct answer is option h.

Reasons for the incorrect answers:

Option a. is given as “transcription”.

Transcription is the process in which the nucleotide sequences of a gene are transcribed into mRNA sequences which code for the proteins. This marks the beginning of gene expression. However, this option alone cannot control the gene expression in the eukaryotes.

Hence, option a. is incorrect.

Option b. is given as “RNA processing”.

After transcription, pre-mRNA is synthesized and further modified before the translation in the cytoplasm. This is called RNA processing and it includes modification of mRNA ends and RNA splicing. However, this option alone cannot control the gene expression in the eukaryotes...

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