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Human Heredity: Principles and Iss...

11th Edition
Michael Cummings
Publisher: Cengage Learning
ISBN: 9781305251052

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BuyFindarrow_forward

Human Heredity: Principles and Iss...

11th Edition
Michael Cummings
Publisher: Cengage Learning
ISBN: 9781305251052
Chapter 8, Problem 1QP
Textbook Problem
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Until 1944, which cellular component was thought to carry genetic information?

  1. a. carbohydrate
  2. b. nucleic acid
  3. c. protein
  4. d. chromatin
  5. e. lipid

Summary Introduction

Introduction: Friedrich Miescher studied the chemical composition of the nucleus early in the 1860s. He extracted the purified nuclei chemically and found a substance which he named nuclein. Nuclein contained carbon, hydrogen, oxygen, phosphorous, and nitrogen. Nuclein was regarded as an important component as it was found in kidney, sperm, liver, and yeast. After many years, it was observed that Miescher’s nuclein contained DNA.

Explanation of Solution

Reason for correct answer:

Scientists identified chromosomes in the twentieth century as carriers of genetic information. Chromosome contained DNA and protein. Proteins contained 20 different subunits in the form of amino acids and DNA had only 4 subunits of nucleotides. Most of the scientists thought protein was the component that had genetic information as it was having a more complex structure to carry the genetic information.

Option c. is given as “protein”.

Protein was one of the chemical structures of the chromosome and was complex enough to carry genetic information as compared with DNA. Hence, the correct answer is option c.

Reasons for incorrect answer:

Option a. is given as, “carbohydrate”.

Carbohydrate contains starch and sugars which help to produce energy in the body...

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