Chapter 3: Cells

The cell theory states that all organisms are made of cells; cells are the most basic unit of life; and

• all existing cells form by free-cell formation.

• all cells are eukaryotic.

• all existing cells are produced by other living cells.

• all cells have a nucleus.

Unlike a eukaryotic cell, a prokaryotic cell does not have

• DNA

• a cell membrane

• cytoplasm

• a nucleus

Which invention played the biggest role in the discovery of cells by early scientists?

• magnifying glass

• lens

• eyeglasses

• compound microscope

Specialized structures that work together inside a cell are called

• organelles.

• prokaryotes.

• eukaryotes.

• nuclei.

Which of the following organelles can be found in the cytoplasm and on the surface of the endoplasmic reticulum?

• mitochondria

• centrosomes

• ribosomes

• centrioles

Which organelle contains enzymes that break down damaged cell parts?

• centriole

• lysosomes

• vacuole

• mitochondria

What are the main differences between plant and animal cells?

• Animal cells are eukaryotes and plant cells are not.

• Plant cells are eukaryotes and animal cells are not

• Animal cells have cell walls and chloroplasts; plant cells do not.

• Plant cells have cell walls and chloroplasts; animal cells do not.

Which phrase best describes the property of selective permeability?

• some molecules pass

• all ions pass

• large molecules pass

• all molecules pass

Which word best describes the structure of the cell membrane?

• phospholipid bilayer

• rigid

• impermeable membrane

• non polar

Which of the following is found in plant cells but not animal cells?

• Cell wall and mitochondria

• Nucleus and cell wall

• Chloroplast and cell wall

• Vacuole and endoplasmic reticulum.