Cell Biology Concepts and Functions

The video explains that all living organisms are made of cells, which can be unicellular or multicellular. Cells are the smallest living units capable of reproduction. They have a membrane, nucleus, and organelles like mitochondria, which are crucial for energy production through cellular respiration. Different cells have specialized functions, forming tissues and organs that work together in systems. Cells have varying lifespans, and the body constantly renews them.

What is the primary difference between unicellular and multicellular organisms?

• Multicellular organisms consist of a single cell.

• Unicellular organisms have multiple cells.

• Unicellular organisms consist of a single cell.

• Multicellular organisms do not have cells.

What percentage of a cell's weight is made up of water?

• One third

• Two thirds

• Half

• Three quarters

Which part of the cell acts as its control center?

• Mitochondrion

• Cytoplasm

• Cell membrane

• Nucleus

What is the process called where food molecules are oxidized to release energy?

• Photosynthesis

• Cellular respiration

• Fermentation

• Glycolysis

What is the primary function of mitochondria in cells?

• To transport nutrients

• To store genetic information

• To produce energy

• To protect the cell

How do cells that perform the same function in the body organize themselves?

• They form systems

• They form organs

• They form tissues

• They form membranes

What is the role of extended cell membranes in intestinal cells?

• To increase surface area for absorption

• To protect against bacteria

• To store nutrients

• To produce energy

Approximately how many cells does an adult male lose per minute?

• 96,000

• 9.6 million

• 96 million

• 960 million

What is the lifespan of red blood cells?

• 18 months

• 13 days

• 30 days

• 120 days

Which type of cell lives for about 18 months?

• White blood cells

• Skin cells

• Red blood cells

• Liver cells