7th Grade Midterm

What is the total magnification of a microscope with two lenses when one lens has maginification of 15, and the other lens has a magnification of 30?

• 15

• 30

• 45

• 450

How does magnification occur in an electron microscope?

• And electron beam creates an image.

• And electron beam makes the object become larger.

• Light is change into electrons by convex lens.

• Light is reflected by an electron beam.

Which of the following statements is a part of the cell theory?

• Only plants are composed of cells.

• All cells are produced from other cells.

• Cells can be produced from nonliving matter.

• Cells are one of the several basic unit of structure and function in living things.

Which of the following statements is NOT part of cell theory?

• Cells are the basic units of structure and function in living things.

• All cells are produced from other cells

• Only animals are composed of cells.

• All living things are composed of cells.

How does the lens of a light microscope work?

• Each concave lens bends light to make the object appear larger.

• Each convex lens bends light to make the object appear larger.

• Each convex lens bends light to make the object become larger.

• The reflection of each concave lens makes the object appear larger.

What does the word resolution refer to?

• how sharp an image is

• how big an image can be

• how many lens a microscope uses

• how much light is needed to see an image

What is the function of the cell membrane?

• to support the cell

• to perform different functions in each cell

• to control whatever enters and leaves the cell

• to form a hard outer covering for the cell

Which organelle is the control center of a cell?

• mitochondria

• ribosome

• nucleus

• chloroplast

Which of the following best describes the function of the mitochondria?

• They convert energy from food molecules into energy the cell can use.

• They store energy from food molecules.

• They store energy from sunlight.

• They produce nucleic acids that release energy.

Unlike Hooke, Leeuwenhoek observed cells that

• had no cell wall.

• came from plants.

• were alive.

• could only be seen with a compound microscope.