Microorganisms

Which tool is needed to see a cell?

• camera

• magnifying glass

• microscope

• telescope

Plants can made thier own food because of an organelle found in plant cells. Which statement correctly identifies the organelle and how it functions?

• Plant cells have cytoplasm that help with digestion.

• Plant cells have a cell wall to make it rigid, so it is able to collect food to grow.

• Plant cells have a nucleus to direct the sunlight to make food for the plant.

• Plant cells have chloroplasts that absorb sun light and help the plant to photosenthesize.

Which two (2) statements are true:

1. Only plant cells have cell walls

2. Only animal cells have a nucleus

3. Only plant cells have chloroplasts

4. Only animal cells have a cell membrane

• 1 and 2

• 2 and 3

• 1 and 3

• 2 and 4

Which two (2) organelles are included only in the plant cell?

• cytoplasm and flegella

• cell wall and chloroplast

• cell membrane and ribosomes

• cell nucleus adn mitochondria

Which statement correctly identifies one of the main differentces between pland and animal cells?

• Plant cells have a cell wall; animal cells do not have a cell wall.

• Plant cells have a cell membrane; animal cells do not have a cell membrane.

• Plant cells do not have a nucleus; animal cells have a nucleus.

• Plant cells do not have cytoplasm; animal cells have cytoplasm.

Sara went to the doctor complaining about a sore throught. The nurse placed a cotton swab in the back of Sara's mouth to swab her throught. Which BEST explains why the nurse swabbed Sara's throught to collect the sample?

• The nurse was collecting a sample to see if she had eaten any food which may have made her sick.

• The nurse was placing medicine in the back of her throught to make her sore throught feel better.

• The nurse was collecting a DNA sample as part of a study to determine the ancestry of the family.

• The nurse was collecting a sample to see if harmful bacteria were growing in her throught.

Which statement BEST describes a way microorganisms can be HARMFUL?

• Microorganisms break down dead organisms.

• Microorganisms act on milk to make yogurt.

• Microorganisms help with digesting food.

• Microorganisms cause meat to spoil.

Which statement BEST describes why a scientist should be careful when handling a petri dish sample with bacteria on it one week later.

• The outside of the plastic bag the petri dish was in was exposed to germs and the scientist did not want to get their hands dirty.

• The scientist did not want to the break the glass petri dish, because lab matericals are expernsive and the science lab has limited funding.

• The petri dish likely has bacteria growing on it that could have made the scientist sick if they were exposed to it.

• The growth on the petri dish would die if it were touched by a scientist.