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Chapter 7: Problem 16

Which of the following is not a key property of hereditary material? a. It must be capable of being copied accurately. b. It must encode the information necessary to form proteins and complex structures. c. It must occasionally mutate. d. It must be able to adapt itself to each of the body's tissues.

Short Answer

Expert verified
The incorrect statement is d: It must be able to adapt itself to each of the body's tissues.

Step by step solution

01

Identify Key Properties

First, let's identify the key properties of hereditary material. Hereditary material, such as DNA, must be capable of being accurately copied so that genetic information is passed down to the offspring. It must also encode the information necessary to form proteins and complex structures, as these are essential for the functioning and development of an organism. Additionally, hereditary material must occasionally mutate to contribute to genetic diversity and evolution.
02

Analyze Each Option

Examine each option to determine if it aligns with the identified key properties of hereditary material: - Option a: Being capable of being copied accurately is essential for passing down genetic information, so it is a key property. - Option b: Encoding the necessary information for proteins and structures is crucial, as this defines the biological blueprint of an organism. - Option c: Occasional mutation is a property of hereditary material, as it allows for variation and adaptation over generations. - Option d: Adapting itself to each of the body's tissues is not a property of hereditary material; instead, the same hereditary material (such as DNA) is used throughout different tissues, and adaptations occur at the cellular or organism level, not at the level of hereditary material itself.
03

Identify the Incorrect Statement

From the analysis, option d does not align with the fundamental key properties of hereditary material. While tissues in the body may differ and have specialized functions, this is due to the expression of genes, not an inherent adaptability of the DNA itself.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Hereditary Material
In the realm of genetics, hereditary material is fundamental. It forms the basis of transferring genetic information from one generation to the next. The most famous hereditary material is DNA, or deoxyribonucleic acid. It carries the instructions needed for an organism鈥檚 growth, development, and functioning. The main properties of hereditary material include:
  • Accurate replication: Ensuring genetic information is passed down without changes.
  • Information encoding: Storing the necessary data to form proteins and structures.
  • Mutation capability: Allowing for genetic variety and evolution.
Without these properties, DNA couldn't serve its crucial role in genetics. It's like having a blueprint that needs to be copied perfectly while occasionally introducing slight changes for evolution.
DNA Properties
DNA is often described as the language of life. This intricate molecule carries the genetic code in the form of a sequence of chemical letters. Its properties allow it to fulfill its role as hereditary material. The primary properties of DNA include:
  • Double helix structure: With two strands winding around each other, providing stability and the ability to be separated for replication.
  • Nucleotide pairing: The sequence of nucleotides, often referred to as A (adenine), T (thymine), C (cytosine), and G (guanine), is the essence of the genetic code.
  • Storage and transfer: Capable of storing vast amounts of information within its sequences and transferring it during cell division.
DNA's unique properties make it well-suited to coding and passing on genetic information. This blueprint helps organisms develop their necessary biological features.
Genetic Variation
Genetic variation is a critical concept in biology. This variation is the engine of evolution, allowing species to adapt to changing environments over time. While DNA's primary function is to replicate accurately, it occasionally mutates, creating genetic variation. This involves:
  • Mutations: These are changes in the DNA sequence, which might introduce new traits.
  • Gene shuffling: During sexual reproduction, genes are shuffled, providing a mix of traits from both parents.
  • Natural selection: Favorable variations may lead to traits that improve survival and reproduction chances.
Without genetic variation, populations could become uniform and lose the ability to adapt, making them vulnerable to extinction. It is through these tiny changes at the genetic level that diversity and adaptability are fostered.
Gene Function
Genes are segments of DNA that hold the instructions for producing proteins鈥攖he workhorses of the cell. Each gene encodes a particular protein, which may play roles in maintaining cell structure, function, or empowering chemical reactions. The key aspects of gene function include:
  • Protein synthesis: The process in which a gene鈥檚 code is translated into a functional protein.
  • Regulation: Various genes turn on or off depending on the body's needs and stages of development.
  • Expression: Not all genes are active at all times; different tissues express different genes to perform specialized functions.
Understanding gene function is vital in medical research and biotechnology, offering insight into how diseases occur and how new treatments can be developed. Genes are the basis of life鈥檚 complexity, determining the unique traits among individuals and defining biological pathways.

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Most popular questions from this chapter

The DNA polymerases are positioned over the following DNA segment (which is part of a much larger molecule) and moving from right to left. If we assume that an Okazaki fragment is made from this segment, what will be the fragment's sequence? Label its \(5^{\prime}\) and \(3^{\prime}\) ends. \(5^{\prime} \ldots.\) CCTTAAGACTAACTACTTACTGGGATC....3' \(3^{\prime} \ldots .\) GGAATTCTGATTGATGAATGACCCTAG....5'

A molecule of composition $$\begin{array}{l} 5^{\prime}-\mathrm{AAAAAAAAAAA}-3^{\prime} \\ 3^{\prime} \text { -TTTTTTTTTTTTT-5 }^{\prime} \end{array}$$ is replicated in a solution of adenine nucleoside triphosphate with all its phosphorus atoms in the form of the radioactive isotope \(^{32}\) P. Will both daughter molecules be radioactive? Explain. Then repeat the question for the molecule 5'-ATATATATATATAT-3' 3'-TATATATATATATA-5'

If the helicases were missing during replication, what would happen to the replication process?

Both strands of a DNA molecule are replicated simultaneously in a continuous fashion on one strand and a discontinuous one on the other. Why can't one strand be replicated in its entirety (from end to end) before replication of the other is initiated?

If a mutation that inactivated telomerase occurred in a cell (telomerase activity in the cell = zero), what do you expect the outcome to be?
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