Grade 7 Knowledge Check

Front

What is the basic unit of life?

Back

Cell

Front

Which organelle is known as the "powerhouse of the cell" because it produces energy?

Back

Mitochondria

Front

What is the name of the flexible barrier that surrounds all cells and controls what enters and exits?

Back

Cell membrane

Front

Which of the following best describes the function of the cell wall in plant cells?

Back

It provides rigid support and protection to the cell

Front

A student observes two cells under a microscope. Cell A has a cell wall, chloroplasts, and a large central vacuole. Cell B has none of these structures. What can the student conclude?

Back

Cell A is a plant cell and Cell B is an animal cell

Front

What is the organelle responsible for controlling all cell activities and containing the cell's DNA?

Back

Nucleus

Front

How does the structure of the cell membrane relate to its function of controlling what enters and exits the cell?

Back

The cell membrane is selectively permeable, allowing only certain materials to pass through

Front

Which organelle packages and ships proteins to other parts of the cell or outside the cell?

Back

Golgi apparatus

Front

A scientist discovers a new single-celled organism. It has no nucleus or membrane-bound organelles. How would this organism be classified?

Back

Prokaryote, because it lacks a nucleus and membrane-bound organelles

Front

What process allows water to move across a cell membrane from an area of high water concentration to an area of low water concentration?

Back

Osmosis