Science Review 2

A container has 300 mL of water. A line has been drawn on the container at the water line.

What will happen to the water in the container if it is left uncovered for a week?

• physical change

• chemical change

Which weighs more, a whole cookie or a cookie that has been broken into many pieces?

• whole cookie

• both weigh the same

• the broken cookie

• it can not be determined

When Manuel looked at a cell through a microscope, he identified the following structures.

*nucleus, chloroplast, vacuole*

What kind of cell did Manuel observe?

• animal cell

• plant cell

In biology class, Felip was looking at plant and animal cells through a microscope. How could he tell which cell is a plant cell and which cell is an animal cell?

• Organelles are only in plant cells

• Nuclei are only in animal cells

• Mitochondria are only in animal cells

• Cell walls are only in plant cells

Would it be a good idea for your health to kill all the bacteria in your body?

• Yes, because most bacteria in your body is harmful.

• No, because many bacteria in your body are beneficial.

• Yes, because getting rid of all bacteria would prevent diseases. This is why doctors use antibiotics.

• No, because harmful bacteria are important to stimulating the immune system.

Which word BEST describes ALL microorganisms?

• beneficial

• harmful

• microscopic

• rare

Amoeba is a single celled organism. Which of the following must be true of an amoeba?

• its one cell does everything it needs to live

• it can only live inside the cells of other living things

• its the smallest living thing

• it causes dangerous diseases

What do vacuoles do?

• They create energy.

• They hold chromosomes.

• They store food, waste, and water.

• They produce movement.

Most cells are too small to be seen with the “naked eye.”

• true

• false

Which change demonstrates a chemical change has took place?

• there will be no noticeable change

• the matter will stay the same

• there is a change in size

• there was a color change