CONNECT WITH LEARNSMART FOR COWAN: MICR
CONNECT WITH LEARNSMART FOR COWAN: MICR
3rd Edition
ISBN: 2818440123740
Author: Cowan
Publisher: MCG
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Chapter 5, Problem 1Q

___% of human DNA is thought to consist of viral DNA sequences.

  1. a. 0.08
  2. b. 8
  3. c. 1
  4. d. 4
  5. e. 5
Expert Solution & Answer
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Summary Introduction

Introduction:

Viruses are considered as the unique biological entities and are obligate intracellular parasites of bacteria, fungi, plants,and animals. They are extremely abundant on the planet. Viruses are non-cellular entities with a definite size, shape and chemical composition. With the help of nucleic acid sequencing techniques, it was possible to determine the picture and number of a variety of viruses on our planet. Viruses have inserted their genetic material permanently into the host cell during infection.

Answer to Problem 1Q

Correct answer:

8% of human DNA is thought to consist of viral DNA sequences. Therefore, option (b) is correct.

Option (b) is given as “8”.

Explanation of Solution

Justify the reasons for the correct statement:

Viruses infect the cell and have the ability to influence their genetic makeup. They alter the way cells, tissues, bacteria, plants,and animals have originated in their present forms. Scientists and researchers estimated that approximately 8% of the human genome consists of viral sequences. This is possible because the viruses have inserted their genetic material permanently into the human DNA.

Hence, option (b) is correct.

Justify the reasons for the incorrect statements:

Option (a) is given as “0.08”.

The human DNA consists of 8% of viral DNA sequence, according to the estimation by scientists. Hence, it is a wrong answer.

Option (c) is given as “1”.

The scientists think that 8% of human DNA consists of the viral DNA sequence. Hence, it is a wrong answer.

Option (d) is given as “45”.

Scientists think that 8% of human DNA consists of viral DNA sequence. Hence, it is a wrong answer.

Hence, options (a), (c) and(d) are incorrect.

Conclusion

8% of human DNA sequence consists of viral DNA sequence due to the alteration in their genetic makeup by a viral infection.

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CONNECT WITH LEARNSMART FOR COWAN: MICR

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