Cell Biology and Animal Classification Quiz

What is a cell?

• A building

• The smallest part of an animal

• The basic unit of life

• A part of a machine

Answer explanation

A cell is the basic unit of life, as it is the smallest structural and functional unit in living organisms. It performs essential functions necessary for life, distinguishing it from other options like buildings or machine parts.

Which of the following is true about all cells?

• They can be seen without a microscope

• They help make life possible

• They are only in animals

• They are non-living

Answer explanation

All cells are essential for life, as they are the basic units of living organisms. They cannot be seen without a microscope, are found in both plants and animals, and are living entities, making the statement 'They help make life possible' true.

What does "unicellular" mean?

• One big organism

• Made of many cells

• Made of one cell

• Invisible

Answer explanation

"Unicellular" refers to organisms that are made of one cell. This distinguishes them from multicellular organisms, which are composed of many cells. Therefore, the correct answer is "Made of one cell."

Which of these is a unicellular organism?

• Human

• Bacteria

• Dog

• Tree

Answer explanation

Bacteria are unicellular organisms, meaning they consist of a single cell. In contrast, humans, dogs, and trees are multicellular, composed of many cells.

What does "multicellular" mean?

• Made of one part

• Made of many cells

• Cannot move

• Can only live in water

Answer explanation

The term 'multicellular' refers to organisms that are made of many cells, as opposed to 'unicellular' organisms, which consist of a single cell. Therefore, the correct answer is 'Made of many cells'.

Which of the following is a multicellular organism?

• Amoeba

• Algae

• Elephant

• Bacterium

Answer explanation

The elephant is a multicellular organism, consisting of many cells that work together. In contrast, amoebas, algae, and bacteria can be unicellular, meaning they consist of a single cell.

How do unicellular organisms survive?

• They do not need to survive

• They depend on other cells

• One cell does all the jobs

• They grow into multicellular ones

Answer explanation

Unicellular organisms survive by performing all necessary life functions within a single cell. This means that one cell does all the jobs required for survival, such as metabolism, reproduction, and response to the environment.

Which part of a cell controls the cell’s activities?

• Cell wall

• Membrane

• Nucleus

• Cytoplasm

Answer explanation

The nucleus is the control center of the cell, regulating its activities by managing gene expression and coordinating cellular functions. It contains the cell's genetic material, which directs all cellular processes.

What do multicellular organisms have that unicellular ones do not?

• Many organs

• Cell wall

• DNA

• One cell

Answer explanation

Multicellular organisms consist of many cells that form specialized structures called organs, which perform distinct functions. Unicellular organisms, on the other hand, are made up of a single cell and lack this level of organization.

What is the function of the cell membrane?

• Make food

• Protect and control what enters or leaves the cell

• Help the cell breathe

• Give color to the cell

Answer explanation

The cell membrane protects the cell and regulates the movement of substances in and out, ensuring the cell maintains homeostasis. This function is crucial for the cell's survival and proper functioning.