Will this be on the test?
A ___________ object is any object that is too small to be seen by the naked eye.
microscopic
Which is smaller: a cell nucleus or a red blood cell?
A cell nucleus
All living things are made of __________.
A) microorganisms
B) cells
C) muscles, bones, and nerves
D) nutrients
B) cells
True or False: A bacteria is a tiny organism made up of a single cell.
True
True or False: A scientific argument always uses evidence.
True
This is an organism that is too small to be seen with the naked eye.
microorganism
Which of these is smallest?
A) An ant
B) A hair louse
C) A bacteria
D) A molecule of oxygen (O2)
D) A molecule of oxygen (O2)
Which of the following is an example of an organism?
A) A spider
B) A chimpanzee
C) A bacteria
D) All of the above
E) None of the above
D) All of the above
True or False: Most microorganisms do not need food.
False
Strong scientific arguments always have:
A) a claim
B) at least one piece of evidence
C) reasoning that explains the evidence
D) A and B
E) A, B, and C
E) A, B, and C (claim, evidence, and reasoning)
These are the tiny structures that make up all living things and are the smallest units able to perform life functions.
cells
Which of these statements is false?
A) A cell is bigger than a molecule of water.
B) All organisms are made up of many cells.
C) Some bacteria help keep humans healthy.
D) Some types of bacteria are bigger than other types of bacteria.
B) All organisms are made up of many cells.
Which of the following is a microorganism? (Select all that apply)
- A red blood cell
- An eyelash mite
- A bacteria
- A human liver cell
An eyelash mite
A bacteria
True or False: If we removed all of the microorganisms from your body, you would be approximately 20 pounds lighter.
False
"All bacteria are harmful" is an example of
A) a claim
B) evidence
C) reasoning
D) none of the above
A) a claim
This is a community of tiny living organisms, like bacteria and fungi, in a particular environment.
microbiome
Order from largest to smallest: Skin cell, water molecule, human, E. coli bacteria, grain of salt
Human>grain of salt>skin cell>E coli bacteria>water molecule
Living things with fewer than normal helpful bacteria in their guts can become infected more easily because there is more ___ and ___ available for harmful bacteria.
A) food, space
B) sunlight, food
C) air, food
D) heat, blood
A) food, space
After a person uses an antibiotic, there are _______ healthy bacteria in his gut microbiome.
A) more
B) less
C) the same number of
B) After a person uses an antibiotic, there are less healthy bacteria in his gut microbiome.
Why might a scientist make a scale model?
A) To study objects that are too small to see with the naked eye.
B) To study something so huge you can't see all of it at the same time.
C) To practice their artistic skills.
D) Both A and B
D) Both A and B
These are medicines that kill microorganisms, especially bacteria.
antibiotics
Which is biggest: a nanometer, a millimeter, or a micrometer?
A millimeter
Bacteria is the human microbiome keep people healthy by __________.
A) Eating all the poison that people might accidentally consume.
B) Helping the body to produce protective mucus.
C) Helping the body to produce immune cells.
D) All of the above
E) B and C
E) B and C
Helping the body to produce protective mucus.
Helping the body to produce immune cells.
This procedure introduces beneficial bacteria into the gut, limiting the food and space for harmful bacteria.
A fecal transplant
Which pair of object CANNOT be drawn on the same scale?
A) A mouse and a deer
B) An eyelash mite and a bacteria cell
C) A red blood cell and an oxygen molecule
D) An oxygen molecule and a water molecule
A red blood cell and an oxygen molecule