Cells and Microorganisms Study Guide

Tanya thinks that bacteria can be harmful to humans. She learned that E. coli is a bacteria that is found in the intestines of humans. She also learned that different strains of E. coli affect the intestines differently. Which effect of E. coli supports Tanya’s claim that bacteria can be harmful to humans?

• Some strains of E. coli increase absorption of nutrients.

• Some strains of E. coli damage the intestinal wall.

• Some strains of E. coli produce vitamin K.

• Some strains of E. coli increase digestion of food.

Salmonella is a bacteria that can be found in raw and undercooked poultry. Which statement provides evidence that Salmonella can be harmful to humans?

• Each year about one million people become ill from foodborne Salmonella.

• When viewed under a microscope, Salmonella appears to be rod-shaped.

• All bacteria, including Salmonella, are harmful to humans.

• Salmonella is found in raw and undercooked chicken.

Some tiny organisms are so small that they can only be seen with _______.

• a mirror
• 3-D glasses
• a microscope
• a binoculars

A plant cell's cell wall does something for the cell. What does it do?

• It makes energy from sunlight.

• It stores information.

• It doesn't do anything.

• It gives the cell structure and shape.

Tags

NGSS.MS-LS1-2

Which of the ingredients used to make bread is a type of microbe?

• salt

• yeast

• milk

• flour

Kyle is observing a cell under a microscope. He makes a sketch of the cell and his teacher helps him label the parts. Based on his sketch, Kyle concludes that the cell must be a plant cell. How does Kyle know that the cell is a plant cell and not an animal cell?

• The cell contains microscopic bacteria.

• The cell contains many smaller cells.

• The cell has a cell wall.

• The cell has many different parts.

Tags

NGSS.MS-LS1-2

The table below lists information about different types of bacteria. Type of Bacteria | Attributes --- | --- Bordetella pertussis | causes whooping cough and symptoms of nausea, severe coughing, and fever Lactobacillus | found in the human intestines; helps to process dairy products Ruminococcus | found in the intestines of plant-eating animals; helps digest grasses and grains Streptococcus pyogenes | causes strep throat, skin infections, soft tissue infections, and pneumonia Vibrio cholerae | causes cholera and symptoms of diarrhea, abdominal cramps, severe dehydration, low blood pressure, and nausea Which of the following statements is true based on information found in the table above?

• Some bacteria cause diseases, but some bacteria are beneficial.

• All forms of bacteria are infectious agents.

• Fever is present in any living organism with bacteria.

• Each type of bacteria can cause only one disease.

What does a plant cell's nucleus do?

• It contains most of the cell's internal parts.

• It is the control center of the cell.

• It gives rigid structure to the plant cell.

• It produces energy for the cell.

Tags

NGSS.MS-LS1-2

Which of the following cell types usually has a rigid cell wall?

• animal cell

• none of these

• plant cell

• single-celled amoeba

Jayne's science class is doing a laboratory investigation on cells. Her teacher gives them each a cotton swab to collect cheek cells from their mouths. They then smear the cheek cells onto a glass slide and look at the cells under a microscope. What can Jayne expect all of her cheek cells to contain?

• a cell wall

• a nucleus

• a chloroplast

• all of these

Tags

NGSS.MS-LS1-1

NGSS.MS-LS1-2