EBK LIFE: THE SCIENCE OF BIOLOGY
EBK LIFE: THE SCIENCE OF BIOLOGY
11th Edition
ISBN: 8220103935432
Author: Sadava
Publisher: MAC HIGHER
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Chapter 17.3, Problem 3R
Summary Introduction

To review:

The reason for the presence of multiple copies of ribosomal ribonucleic acid (rRNA) genes in the mammalian genome.

Introduction:

The rRNA is a part of the structure called ribosome, which is the site for protein synthesis or translation process. There are different types of rRNA based on the size and it forms the core of the ribosome, which includes 5 S, 5.8 S, 18 S, and 28 S where S stands for Svedberg unit. The rRNA genes are moderately repetitive sequences (10–1000 times) found in the eukaryotic genome.

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Why do humans have such a large number of nucleotides (3.2 billion base pairs) compared to the number of nucleotides in the Japanese pufferfish (with only 400 million base pairs)?  the difference is due primarily to a relative abundance of intron nucleotides in humans the difference is due primarily to a relative abundance of euchromatin sequences in humans the difference is due primarily to a relative abundance of intron sequences in humans the difference is due primarily to a relative abundance of protein-coding genes in humans the difference is due primarily to a relative abundance of exon sequences in humans
What is a gene? Why are genes for rRNA and tRNA considered to be genes even though they do not produce polypeptides?
The figure below shows the introns and exons found in gene X. The size of each exon and intron is shown as well. A study on this organism found that two mature mRNA molecules are produced for this gene. One is 867 nucleotides in length, and the other is 685 nucleotides in length. Name the process responsible for producing this variation. Also explain how these 867 and 685 nucleotide fragments were produced by referring to the information provided. Hint: This organism produces a poly-A tail of 150 nucleotides.
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