Mitochondria and Chromosome Basics

This video introduces chromosomes, explaining their structure and function within cells. It covers the differences between bacterial and human chromosomes, the chromosome numbers in somatic and germline cells, and the distinctions between male and female chromosomes. The video also discusses mitochondrial DNA and its role in maternal inheritance, concluding with a summary of key points.

What is the primary reason DNA is compacted into chromosomes within a cell?

• To protect DNA from mutations

• To enhance DNA replication speed

• To reduce the space DNA occupies

• To increase the cell's energy production

How does a bacterial chromosome differ from a human chromosome?

• Bacterial chromosomes are found outside the nucleus

• Bacterial chromosomes are linear

• Bacterial chromosomes are circular

• Bacterial chromosomes contain more genes

How many chromosomes are present in human somatic cells?

• 23

• 46

• 69

• 92

What is the chromosome count in human germline cells?

• 23

• 92

• 46

• 69

What distinguishes male chromosomes from female chromosomes?

• Females have a Y chromosome

• Females have no X chromosomes

• Males have a Y chromosome

• Males have two X chromosomes

What is a Barr body?

• An inactive X chromosome

• A bacterial chromosome

• An active Y chromosome

• A type of mitochondrial DNA

From which parent is mitochondrial DNA inherited?

• Father

• Mother

• Neither parent

• Both parents equally

What is the primary function of mitochondria in cells?

• Protein synthesis

• ATP synthesis

• DNA replication

• Photosynthesis

What does the theory of endosymbiosis suggest about mitochondria?

• They are responsible for cell division

• They are unique to animal cells

• They were once free-living microbes

• They evolved from chloroplasts

Why is mitochondrial DNA useful for tracing maternal lineage?

• It mutates rapidly

• It is found in the nucleus

• It is inherited only from the mother

• It is inherited from the father