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Chapter 3: Problem 11

Which of these descriptions of rRNA is true? a. It is single-stranded. b. It catalyzes steps in protein synthesis. c. It forms part of the structure of both subunits of a ribosome. d. It is produced in the nucleolus. e. All of these are true.

Short Answer

Expert verified
e. All of these are true.

Step by step solution

01

rRNA (Ribosomal RNA) is a type of RNA that, when combined with proteins, makes up the ribosomes - the cellular machinery responsible for protein synthesis. rRNA is a crucial component of ribosomes and has both structural and catalytic functions. #Step 2: Analyzing the options# #Option a: It is single-stranded#

RNA, including rRNA, is typically single-stranded. This statement is true. #Option b: It catalyzes steps in protein synthesis#
02

rRNA plays a critical role in the ribosome's catalytic activity, assisting in peptide bond formation during protein synthesis. So, this statement is true. #Option c: It forms part of the structure of both subunits of a ribosome#

Ribosomes consist of two subunits: a large subunit and a small subunit. rRNA is a key component of both subunits, providing structural stability and catalytic function. Thus, this statement is true. #Option d: It is produced in the nucleolus#
03

The nucleolus is a non-membrane-bound structure found within the nucleus of eukaryotic cells. It is the site of rRNA synthesis and ribosome assembly. So, this statement is also true. #Step 3: Combining the findings# Since all the options a, b, c, and d are correct statements about rRNA, we can conclude that: #Conclusion: The correct answer#

e. All of these are true.

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