Lab Safety and Interpreting Data

These are bacterial cells that have been stained. Which microscope would have been used to take this image?

• Light Microscope

• Dissecting Microscope

• Transmission Electron Microscope

• Scanning Electron Microscope

Tags

NGSS.MS-LS1-1

Approved eye protection devices (such as goggles) are worn in the laboratory

• to improve your vision

• to avoid eye strain

• any time chemicals, heat or glassware are used

• only if you don’t have corrective glasses

The graph shown displays the moose population of New Hampshire. Which of the observations below is supported by the graph?

• The moose population grew from 2002-2005.

• The moose population was highest in 2005.

• The moose population will be extinct by 2025.

• The moose population has only declined since 1994.

Tags

NGSS.HS-LS2-1

NGSS.HS-LS2-2

NGSS.HS-LS4-5

If you do not understand a direction or part of a lab procedure, you should

• try several methods until something works.

• skip it and go on to the next part.

• figure it out as you do the lab

• ask the instructor before proceeding

The bar graph shows energy production over time. Which of the following conclusions is supported by the data shown?

• Biofuels are not a valuable energy resource.

• Coal is the most efficient form of energy production.

• Oil production has a negative impact on the environment.

• Nuclear energy production has shown the greatest decline over time.

Lab work can be started immediately upon entering the laboratory even if the instructor is not yet present.

• True

• False

Answer explanation

Only begin working on a lab after yu have directed to do so.

Using only the information provided in the graph, which of the following is a claim that could be made?

• Enzyme A will be most active at a pH of 3.

• Enzyme B will be most active at a pH of 3.

• Enzymes A and B are both inactive at a pH of 8.

• Enzymes A and B are impacted by changes in pH.

Answer explanation

Based on the information given we can see that Enzyme activity is impacted by changes in pH levels.

We can eliminate the other answer choices because : Enzyme A has low activity at a pH of 3 and at pH 8 there is no activity. The opposite can be said in regards to Enzyme B; there is no activity at pH 3 and at pH 8 there is low activity.

Chipped or cracked glassware is okay to use.

• True

• False

Answer explanation

If any glassware is cracked or broken do not proceed, tell the instructor immediately.

The disease polio once sickened thousands of children every year. The graph depicts the number of polio cases that occurred between 1952 and 1973, based on information from the U.S. Department of Health, Education, and Welfare and the Centers for Disease Control. The data best support which of these statements?

• Introducing a vaccine for polio had no effect on the number of cases of polio diagnosed each year.

• The polio vaccine was effective in protecting thousands of people from this disease.

• The vaccine proved ineffective because cases of polio rose between 1957 and 1959.

• The sources of the data are not reliable and, therefore, the data should be ignored.

You have been injured in the laboratory (cut, burn,etc.). First you should

• apply first aid yourself

• visit the school nurse after class

• tell the science instructor at once

• see a doctor after school