Chapter 2 Cells

What are cells?

• the smallest units of mater

• tiny organisms found in water

• invisible organisms that make up all living things

• the smallest units that can carry out activities of life

Choose the word that best completes the sentence.

All cells obtain _________, remove waste products, and _______________.

• DNA, grow

• energy, move

• DNA, reproduce

• energy, reproduce

What scientific development was most responsible for the development of the cell theory?

• the invention of cork

• the discovery of ribosomes

• the discovery of animalcules

• the invention of the microscope

Water travels across a membrane during the process of

• mitosis

• osmosis

• cell division

• making proteins

What is the advantage of a small, rather than a large, cell?

• A small cell has fewer organelles.

• A small cell does not live as long as a large cell.

• Materials can move more quickly in a small cell.

• Materials can stay in a small cell for a longer time.

Which structure provides support for a plant cell?

• vacuole

• cell wall

• chloroplast

• cell membrane

Which structure within an animal cell recycles worn-out cell parts?

• lysosome
• mitochondria
• nucleus
• endoplasmic reticulum

In which structure does the cell convert sunlight into food?

• mitochondria
• endoplasmic reticulum
• chloroplasts
• nucleus

In which direction will the substances most likely move during the process of diffussion?

• From an area of high concentration to an area of low concentration
• From an area of low concentration to an area of high concentration
• From an area of equal concentration to an area of unequal concentration
• From an area of low pressure to an area of high pressure

What material stores information about how an organism will grow and develop?

• ribosomes

• DNA

• Protein
• vacuoles