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The human genome contains less than 50,000 genes, yet a human has the capability of producing more than 1012different antibody molecules. How can this evidence be used to support the claim that the human body has an immune system that is both effective and efficient? a. There are so many different antibody molecules that can be made, each of which can specifically target a particular pathogen to destroy it. This specificity makes the immune system more effective. The immune system is also efficient because each antibody need to have its own gene. b. There are so many different antibody molecules that can be made, each of which can nonspecifically target a particular pathogen to destroy it. This non-specificity makes the immune system more effective. The immune system is also efficient because each antibody does not need to have its own gene. c. There are so many different antibody molecules that can be made, each of which can specifically target a particular pathogen to destroy it. This specificity makes the immune system more efficient. The immune system is also effective because each antibody does not need to have its own gene. d. There are so many different antibody molecules that can be made, each of which can specifically target a particular pathogen to destroy it. This specificity makes the immune system more effective. The immune system is also efficient because each antibody does not need to have its own gene.

Step by step solution

01

Identify the Core Concepts

The problem involves understanding how the immune system can be both effective and efficient given the disparity between the number of genes and the number of antibody molecules.

02

Understand Immunoglobulin Diversity

The immune system can produce more than 10^{12} different antibody molecules even though the human genome has less than 50,000 genes. This suggests that antibodies are produced through a mechanism that does not require each antibody to have its own distinct gene.

03

Explain Specificity and Efficiency

Specific antibodies target specific pathogens, which makes the immune system effective in identifying and neutralizing diverse threats. Efficiency is achieved through mechanisms like gene rearrangement, alternative splicing, and somatic hypermutation, which allow a vast variety of antibodies to be produced without requiring a vast number of genes.

04

Select Correct Answer

Evaluate the options to find the one that correctly states the effectiveness due to specificity and efficiency due to not requiring each antibody to have its own distinct gene.

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Key Concepts

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

Antibody Specificity

The human immune system is incredibly effective because of the specificity of antibodies. Antibody specificity means that each antibody is designed to recognize and bind to a specific antigen, such as a virus or bacteria. This precise fit ensures that the immune system can target and neutralize pathogens efficiently, preventing them from causing disease.
When a pathogen enters the body, the immune system generates a specific antibody that binds to the antigen on the pathogen's surface. This binding can neutralize the pathogen directly or mark it for destruction by other immune cells.
The production of highly specific antibodies allows the immune system to identify and attack a vast array of pathogens accurately. This specificity also enables the immune system to remember pathogens it has encountered before, providing immunity against future infections.

Gene Rearrangement

Despite the human genome containing fewer than 50,000 genes, it can produce over a trillion different antibodies. This diversity is made possible by a process known as gene rearrangement. Gene rearrangement occurs in B cells, where segments of DNA encoding parts of the antibody molecule are shuffled and recombined in various ways.
This shuffling involves the variable (V), diversity (D), and joining (J) gene segments to create a unique sequence for each antibody. This process generates a tremendous variety of antibodies from a limited number of genes.
By randomly combining different V, D, and J segments during B cell development, the immune system can produce a vast repertoire of antibodies. This mechanism ensures that there is likely an antibody capable of binding to almost any pathogen the body encounters.

Somatic Hypermutation

Somatic hypermutation is another mechanism that enhances antibody diversity and specificity. Once a B cell has been activated by binding to an antigen, it undergoes rapid mutation in the variable region of the antibody gene. These mutations can change the amino acid sequence of the antibody's antigen-binding site, potentially increasing its affinity for the antigen.
This process results in a pool of B cells that produce antibodies with slightly different antigen-binding sites. B cells that produce antibodies with higher affinity for the antigen are selected for survival and proliferation through a process called affinity maturation.
By continuously improving the binding affinity of antibodies through somatic hypermutation and selection, the immune system becomes even more effective at targeting and neutralizing pathogens.