Test Your Knowledge About Mutation

1. Damage and errors in DNA cause___________

Mutation

DNA repair

Translation

Transcription

Damage and errors in DNA can lead to changes in the genetic information, resulting in a mutation. Mutations can occur due to various factors such as exposure to harmful substances, errors during DNA replication, or environmental factors. These mutations can have different effects, ranging from no impact to significant changes in the organism's traits or functions. Thus, damage and errors in DNA can cause mutations, altering the genetic makeup of an organism.

Explanation

Damage and errors in DNA can lead to changes in the genetic information, resulting in a mutation. Mutations can occur due to various factors such as exposure to harmful substances, errors during DNA replication, or environmental factors. These mutations can have different effects, ranging from no impact to significant changes in the organism's traits or functions. Thus, damage and errors in DNA can cause mutations, altering the genetic makeup of an organism.

2. Name the term given to the type of mutation which depends on the conditions of the environment.

Forward mutation

Reverse mutation

Conditional lethal mutation

Gain of function mutation

A conditional lethal mutation refers to a type of mutation that only causes cell death under specific conditions in the environment. This means that the mutation is not lethal in all conditions, but instead, it depends on certain factors such as temperature, pH, or the presence of certain substances. The mutation may disrupt essential cellular processes or functions, leading to cell death only when the specific conditions required for its lethality are met.

Explanation

A conditional lethal mutation refers to a type of mutation that only causes cell death under specific conditions in the environment. This means that the mutation is not lethal in all conditions, but instead, it depends on certain factors such as temperature, pH, or the presence of certain substances. The mutation may disrupt essential cellular processes or functions, leading to cell death only when the specific conditions required for its lethality are met.

3. Addition or deletion of bases causes which kind of mutation?

Transversion

Frameshift mutation

Transition

Transcription

Frameshift mutation occurs when bases are added or deleted in the DNA sequence, causing a shift in the reading frame during translation. This mutation can have significant effects on the resulting protein, as it alters the entire sequence of amino acids downstream of the mutation. It can lead to a nonfunctional or completely different protein being produced, which can have detrimental effects on the organism. Therefore, frameshift mutation is the correct answer for the given question.

Explanation

Frameshift mutation occurs when bases are added or deleted in the DNA sequence, causing a shift in the reading frame during translation. This mutation can have significant effects on the resulting protein, as it alters the entire sequence of amino acids downstream of the mutation. It can lead to a nonfunctional or completely different protein being produced, which can have detrimental effects on the organism. Therefore, frameshift mutation is the correct answer for the given question.

4. All types of mutations are transferable among generations.

True

False

Mutations are changes in the DNA sequence that can occur randomly or due to environmental factors. While mutations can be inherited and passed on to future generations, not all mutations are transferable. Some mutations may occur in somatic cells and only affect the individual in which they occur, while others may occur in germ cells and be passed on to offspring. Therefore, it is incorrect to say that all types of mutations are transferable among generations.

Explanation

Mutations are changes in the DNA sequence that can occur randomly or due to environmental factors. While mutations can be inherited and passed on to future generations, not all mutations are transferable. Some mutations may occur in somatic cells and only affect the individual in which they occur, while others may occur in germ cells and be passed on to offspring. Therefore, it is incorrect to say that all types of mutations are transferable among generations.

5. Name the type of mutation in which the cause of mutation is not known.

Spontaneous mutation

Suppressor mutation

Nonsense mutation

Mis-sense mutation

Spontaneous mutation refers to a type of mutation where the cause is not known. It occurs naturally without any external factors or exposure to mutagens. These mutations can arise from errors during DNA replication or from spontaneous changes in the DNA structure. Since the cause is unknown, it is difficult to pinpoint the exact reason behind the occurrence of these mutations.

Explanation

Spontaneous mutation refers to a type of mutation where the cause is not known. It occurs naturally without any external factors or exposure to mutagens. These mutations can arise from errors during DNA replication or from spontaneous changes in the DNA structure. Since the cause is unknown, it is difficult to pinpoint the exact reason behind the occurrence of these mutations.

6. Which of the following is NOT a type of reverse mutation?

Back mutation

Intergenic suppressor mutation

Intragenic suppressor mutation

Missense mutation

A missense mutation is a type of point mutation where a single nucleotide change results in a different amino acid being incorporated into the protein sequence. It is not a type of reverse mutation because it does not revert the mutated gene back to its original form. In contrast, back mutation, intergenic suppressor mutation, and intragenic suppressor mutation are all types of reverse mutations where the mutated gene reverts back to its original form.

Explanation

A missense mutation is a type of point mutation where a single nucleotide change results in a different amino acid being incorporated into the protein sequence. It is not a type of reverse mutation because it does not revert the mutated gene back to its original form. In contrast, back mutation, intergenic suppressor mutation, and intragenic suppressor mutation are all types of reverse mutations where the mutated gene reverts back to its original form.

7. What is the detection technique of auxotrophs?

Spread plating

Replica plating

Streaking

Pouring

Replica plating is a detection technique used for auxotrophs. It involves making an imprint of bacterial colonies onto a replica plate containing a different medium. This allows for the identification of auxotrophs, which are mutant strains that require specific nutrients not needed by wild-type strains. By comparing the growth patterns on the replica plate to the original plate, auxotrophs can be detected based on their inability to grow on the medium lacking the required nutrients.

Explanation

Replica plating is a detection technique used for auxotrophs. It involves making an imprint of bacterial colonies onto a replica plate containing a different medium. This allows for the identification of auxotrophs, which are mutant strains that require specific nutrients not needed by wild-type strains. By comparing the growth patterns on the replica plate to the original plate, auxotrophs can be detected based on their inability to grow on the medium lacking the required nutrients.

8. Mark the INCORRECT statement about mutation.

Mutation is predestined

Major source of evaluation

Usually deleterious and recessive

It is a reversible process

The statement "Mutation is predestined" is incorrect. Mutations are random and spontaneous changes in the DNA sequence and are not predetermined or predestined. They can occur due to various factors such as errors during DNA replication or exposure to mutagens. Mutations can have different effects on an organism, and they can be beneficial, neutral, or deleterious. Therefore, the statement that mutations are predestined is incorrect.

Explanation

The statement "Mutation is predestined" is incorrect. Mutations are random and spontaneous changes in the DNA sequence and are not predetermined or predestined. They can occur due to various factors such as errors during DNA replication or exposure to mutagens. Mutations can have different effects on an organism, and they can be beneficial, neutral, or deleterious. Therefore, the statement that mutations are predestined is incorrect.

9. Which of the following is NOT true for loss of function mutation?

Usually recessive

Most common mutation

Increases the activity of the gene

Null allelic mutation

Loss of function mutations typically result in a decrease or complete loss of the activity of a gene. This means that the gene is not functioning properly or not producing the expected protein. Therefore, it is not true that loss of function mutations increase the activity of the gene.

Explanation

Loss of function mutations typically result in a decrease or complete loss of the activity of a gene. This means that the gene is not functioning properly or not producing the expected protein. Therefore, it is not true that loss of function mutations increase the activity of the gene.

10. Which of the following chemical mutagen affects only replicating DNA?

Acridine dye

Alkylating agent

Deaminating agent

Base analog

Base analogs are chemical mutagens that resemble the nucleotide bases found in DNA. They can be incorporated into the DNA during replication, leading to the introduction of mutations. Since base analogs specifically affect replicating DNA, they do not have a significant impact on non-replicating DNA. This makes base analogs a unique type of chemical mutagen that selectively targets replicating DNA.

Explanation

Base analogs are chemical mutagens that resemble the nucleotide bases found in DNA. They can be incorporated into the DNA during replication, leading to the introduction of mutations. Since base analogs specifically affect replicating DNA, they do not have a significant impact on non-replicating DNA. This makes base analogs a unique type of chemical mutagen that selectively targets replicating DNA.