Biology Unit 1 Test Review

Which of the following statements about a controlled experiment is true?

• all variables must be kept the same

• only one variable is tested at a time

• scientists always use controlled experiments

• controlled experiments cannot be performed on living things

Tags

NGSS.MS-PS1-2

in a controlled experiment, the __________ is the cause, and the _______________ is the effect.

• independent variable; dependent variable

• dependent variable; independent variable

• hypothesis; theory

• theory; hypothesis

Tags

NGSS.MS-PS2-2

Martha was baking bread and noticed that her yeast was creating bubbles when mixed with warm water. Martha wondered if her yeast would create more bubbles if she mixed sugar in with the warm water. She added five grams of yeast and 50 milliliters of water to six flasks. She also added two grams of sugar to two of the flasks and four grams of sugar to two other flasks (leaving two with just water). She attached a balloon to the top of each flask and observed how much each balloon inflated after fifteen minutes.

In this experiment, which were part of a control

group?

• The flasks with water and two grams of sugar

• the flasks with only water

Tags

NGSS.MS-LS2-1

A student notices that when she doesn’t sleep well, she usually does worse on schoolwork. Which part of scientific methodology describes her recording the grades and amount of sleep of her classmates?

• 1. Making Observations and Asking Questions

• 1. Inferring and Hypothesizing

• 1. Designing Controlled Experiments

• 1. Collecting Data

• 1. Analyzing Conclusions

Bill likes to go to horse races. At the races, he notices that a certain breed of horse usually comes in first place, while a different breed of horse usually comes in last place. Which of the following is a testable scientific question that Bill could ask about his observations?

• a.     Do some horses want to win the race more than others?

• a.     Are some breeds of horses prettier than others?

• a.     Do slower breeds of horses lack determination?

• a.     Do faster breeds of horses have longer legs?

Adrian read about a new antimicrobial in a popular magazine. The advertisement claimed that the product Bactokil prevents bacterial growth. So, Adrian conducted a controlled experiment to test the product claims.

Adrian added 1 mL of a solution containing different concentrations of Bactokil to equivalent samples of Escherichia coli bacteria and plated them in Petri dishes. After 24 hours, he counted the number of colonies on each plate. A graph of his results is shown below.

Approximately how many colonies of E. coli are there at 0% concentration Bactokil?

• 200

• 210

• 230

• 250

Tags

NGSS.MS-LS1-5

NGSS.MS-LS2-1

Adrian read about a new antimicrobial in a popular magazine. The advertisement claimed that the product Bactokil prevents bacterial growth. So, Adrian conducted a controlled experiment to test the product claims.

Adrian added 1 mL of a solution containing different concentrations of Bactokil to equivalent samples of Escherichia coli bacteria and plated them in Petri dishes. After 24 hours, he counted the number of colonies on each plate. A graph of his results is shown below.

Approximately how many colonies of E. coli are there at 100% concentration Bactokil?

• 200

• 210

• 230

• 250

Tags

NGSS.HS-PS1-5

Adrian read about a new antimicrobial in a popular magazine. The advertisement claimed that the product Bactokil prevents bacterial growth. So, Adrian conducted a controlled experiment to test the product claims.

Adrian added 1 mL of a solution containing different concentrations of Bactokil to equivalent samples of Escherichia coli bacteria and plated them in Petri dishes. After 24 hours, he counted the number of colonies on each plate. A graph of his results is shown below.

Was Adrian's/ the company's hypothesis supported? (Read carefully)

• Yes; Increased Bactokil prevented the growth of bacteria

• No; increased Bactokil did not prevent the growth of bacteria

• Yes; increased Bactokil did not prevent the growth of bacteria

• No; increased Bactokil prevented the growth of bacteria

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-4

if you add an enzyme to a chemical reaction, what will happen?

• the reaction will speed up and create less product

• the reaction will slow down and create less product

• the reaction will speed up and create more product

• the reaction will slow down and create more product

Tags

NGSS.HS-PS1-5

What part of the enzyme catalyzed reaction is labeled with 1?

• Enzyme

• Active Site

• Substrate

• Products