Mitochondrial Inheritance

Description: This quiz covers various aspects of mitochondrial inheritance, including its unique characteristics, patterns of transmission, and implications for genetic disorders.
Number of Questions: 15
Created by:
Tags: mitochondrial inheritance genetics cellular biology
Attempted 0/15 Correct 0 Score 0

Which cellular organelle is responsible for generating most of the cell's energy through oxidative phosphorylation?

  1. Mitochondria

  2. Chloroplasts

  3. Ribosomes

  4. Endoplasmic Reticulum


Correct Option: A
Explanation:

Mitochondria are the primary sites of cellular respiration, where energy is produced through the process of oxidative phosphorylation.

What is the primary mode of inheritance for mitochondrial DNA (mtDNA)?

  1. Mendelian Inheritance

  2. Cytoplasmic Inheritance

  3. Sex-Linked Inheritance

  4. Incomplete Dominance


Correct Option: B
Explanation:

Mitochondrial DNA is inherited solely from the mother, following a non-Mendelian pattern known as cytoplasmic inheritance.

Which genetic material is present in mitochondria?

  1. Nuclear DNA

  2. Mitochondrial DNA (mtDNA)

  3. Ribosomal RNA (rRNA)

  4. Transfer RNA (tRNA)


Correct Option: B
Explanation:

Mitochondria contain their own circular DNA, known as mitochondrial DNA (mtDNA), which is distinct from the nuclear DNA.

What is the approximate number of genes encoded by mitochondrial DNA?

  1. 13

  2. 37

  3. 100

  4. 1000


Correct Option: B
Explanation:

Human mitochondrial DNA encodes approximately 37 genes, including those involved in oxidative phosphorylation and protein synthesis.

Which genetic disorder is caused by mutations in mitochondrial DNA?

  1. Cystic Fibrosis

  2. Huntington's Disease

  3. Mitochondrial Encephalopathy, Lactic Acidosis, and Stroke-Like Episodes (MELAS)

  4. Down Syndrome


Correct Option: C
Explanation:

MELAS is a mitochondrial disorder caused by mutations in mtDNA, characterized by seizures, muscle weakness, and lactic acidosis.

What is the phenomenon where a cell contains two or more genetically distinct populations of mitochondria?

  1. Heteroplasmy

  2. Homoplasmy

  3. Mitochondrial Fusion

  4. Mitochondrial Fission


Correct Option: A
Explanation:

Heteroplasmy refers to the coexistence of different mtDNA genotypes within a single cell or individual.

Which enzyme is responsible for replicating mitochondrial DNA?

  1. DNA Polymerase I

  2. DNA Polymerase II

  3. DNA Polymerase III

  4. DNA Polymerase Gamma


Correct Option: D
Explanation:

DNA Polymerase Gamma is the main enzyme involved in the replication of mitochondrial DNA.

What is the primary function of mitochondrial ribosomes?

  1. Protein Synthesis

  2. RNA Transcription

  3. DNA Replication

  4. Lipid Metabolism


Correct Option: A
Explanation:

Mitochondrial ribosomes are responsible for synthesizing proteins that are essential for mitochondrial function.

Which cellular process is responsible for the degradation and recycling of damaged mitochondria?

  1. Autophagy

  2. Apoptosis

  3. Necrosis

  4. Exocytosis


Correct Option: A
Explanation:

Autophagy is the process by which damaged mitochondria are selectively degraded and recycled by the cell.

What is the term used to describe the transfer of mitochondrial DNA from one organism to another?

  1. Horizontal Gene Transfer

  2. Vertical Gene Transfer

  3. Lateral Gene Transfer

  4. Transduction


Correct Option: A
Explanation:

Horizontal gene transfer refers to the transfer of genetic material between organisms that are not parents and offspring.

Which technique is commonly used to detect mutations in mitochondrial DNA?

  1. Karyotyping

  2. Polymerase Chain Reaction (PCR)

  3. Southern Blotting

  4. Flow Cytometry


Correct Option: B
Explanation:

Polymerase Chain Reaction (PCR) is a widely used technique for amplifying and detecting specific DNA sequences, including those in mitochondrial DNA.

What is the term used to describe the process by which mitochondria fuse together?

  1. Mitochondrial Fusion

  2. Mitochondrial Fission

  3. Mitochondrial Transport

  4. Mitochondrial Biogenesis


Correct Option: A
Explanation:

Mitochondrial fusion is the process by which two or more mitochondria merge to form a single, larger mitochondrion.

Which cellular process is responsible for dividing mitochondria into smaller units?

  1. Mitochondrial Fusion

  2. Mitochondrial Fission

  3. Mitochondrial Transport

  4. Mitochondrial Biogenesis


Correct Option: B
Explanation:

Mitochondrial fission is the process by which a single mitochondrion divides into two or more smaller mitochondria.

What is the term used to describe the process by which mitochondria are transported along cellular structures?

  1. Mitochondrial Fusion

  2. Mitochondrial Fission

  3. Mitochondrial Transport

  4. Mitochondrial Biogenesis


Correct Option: C
Explanation:

Mitochondrial transport refers to the movement of mitochondria along cellular structures, such as microtubules and actin filaments.

Which cellular process is responsible for the generation of new mitochondria?

  1. Mitochondrial Fusion

  2. Mitochondrial Fission

  3. Mitochondrial Transport

  4. Mitochondrial Biogenesis


Correct Option: D
Explanation:

Mitochondrial biogenesis is the process by which new mitochondria are formed within a cell.

- Hide questions