Biology: The Unity and Diversity of Life (MindTap Course List)
Biology: The Unity and Diversity of Life (MindTap Course List)
14th Edition
ISBN: 9781305073951
Author: Cecie Starr, Ralph Taggart, Christine Evers, Lisa Starr
Publisher: Cengage Learning
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Textbook Question
Chapter 9, Problem 1SQ

A chromosome contains many different genes that are transcribed into different ___ .

  1. a. proteins
  2. b. polypeptides
  3. c. RNAs
  4. d. a and b
Expert Solution & Answer
Check Mark
Summary Introduction

Introduction: The genetic information of DNA is based on the nucleotide base sequences. These sequences are transcribed into mRNA triplets and are called codons. These mRNA triplet nucleotides are then translated to form a polypeptide that codes for specific proteins and enzymes.

Answer to Problem 1SQ

Correct answer: A chromosome contains many different genes that are transcribed into different RNAs. Therefore, option c. is correct.

Explanation of Solution

Reason for the correct statement:

DNA consists of genetic instructions in the form of gene sequences. It directs messenger RNA (mRNA) synthesis in the cell. During formation of mRNA in a process known as transcription, each letter in the gene sequence is copied that codes for a particular amino acid. Thus, different genes are transcribed into different mRNAs.

Hence, option c. is correct.

Reasons for the incorrect statements:

Option a. is given as “proteins”. Proteins refer to a long chain of polypeptides formed after translation. Hence, it is a wrong answer.

Option b. is given as “polypeptides”. Polypeptides are formed from mRNA during translation process, so it is a wrong answer.

Option d. is given as “a. and b.” Polypeptides and proteins are synthesized by translation, so it is a wrong answer.

Hence, options a., b., and d. are incorrect.

Conclusion
During transcription, different genes transcribe into different mRNAs.

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    Mitochondrial mutations; Author: Useful Genetics;https://www.youtube.com/watch?v=GvgXe-3RJeU;License: CC-BY