Life at the Cellular Level: Exploring Cells and Their Functions

The video explains the basics of cell theory, highlighting that all living organisms are made of cells, which are the smallest units of life. It discusses the limitations of cell size and the unique capabilities of multicellular organisms, where cells differentiate to perform specific functions. The role of DNA and genes in cell differentiation is covered, explaining how different genes are expressed in different cells. The video also explores stem cells, their potential for differentiation, and their therapeutic uses in medicine.

What is the smallest unit of life according to cell theory?

• Molecule

• Cell

• Tissue

• Organ

Why do cells divide as they grow larger?

• To increase their surface area

• To maintain a preferable surface area to volume ratio

• To decrease their volume

• To reduce their surface area

What happens when a cell's internal volume becomes too large for its surface area?

• The cell stops functioning

• The cell divides

• The cell merges with another cell

• The cell shrinks

What is a unique feature of multicellular organisms?

• They do not have tissues or organs

• Their cells can differentiate and perform specific tasks

• Their cells perform identical tasks

• They have a single type of cell

What is the significance of tissues and organs in multicellular organisms?

• They only exist in single-celled organisms

• They are identical in all organisms

• They support the entire organism with unique roles

• They have no specific roles

What carries the genetic code within cells?

• Proteins

• DNA

• Carbohydrates

• Lipids

How do different cells in the body develop unique functions?

• By having different DNA

• By expressing different genes

• By altering their cell membrane

• By changing their DNA

What is the role of genes in cell differentiation?

• Genes are not involved in differentiation

• Genes determine the size of the cell

• Genes can be turned on or off to lead to differentiation

• Genes only affect the cell membrane

What are stem cells capable of?

• Existing in different levels of undifferentiation

• Performing only one specific function

• Having no genetic material

• Being unable to divide

Why are embryonic stem cells considered suitable for therapeutic uses?

• They cannot differentiate

• They are already differentiated

• They can only become skin cells

• They can be turned into any other type of cell