Lab Assignment #1

The base unit of fluid volume in the metric system is the a. None of the answer choices are correct. b. meter. c. gram. d. milliliter. e. liter.

liter

Which of the following units is greatest? a. millimeter b. centimeter c. decimeter d. meter

meter

in the metric system what is the base unit for length?

meter

To convert a larger unit of measure to a smaller one (grams to milligrams for example) you would ____ a factor. a. multiply by b. divide by c. add d. subtract

multiply by

A solution with a pH of 7 is a. acidic. b. neutral. c. alkaline. d. basic.

neutral

What class of organisms is likely to inhabit the human body? a. neutrophiles b. alkaliphiles c. acidophiles

neutrophiles Human body pH is near 7, and therefore most bacteria that inhabit the body are neutrophiles.

How does pH negatively affect the metabolism of microorganisms? a. pH changes can denature enzymes b. pH changes can disrupt cell wall structure c. pH changes alter the availability of water

pH changes can denature enzymes pH changes can change the charges on amino acids in proteins and result in denaturation and loss of activity.

In the pillbug experiment, your hypothesis a. had to be supported by your data (proving your hypothesis was true). b. was formulated after you completed the experiment. c. was related to the food pillbugs prefer. d. was related to the environment pillbugs prefer.

was related to the environment pillbugs prefer.

Assume you drink 250mL of soda out of a 1 liter soda bottle. How many liters are left? a. 0.75 liters b. 0.075 liters c. 750 liters d. 75 liters e. 7.5 liters

0.75 liters Explanation Convert 1 liter to milliliters and subtract 250 mL to find remaining mL. Example: 1 liter = 1000 mL-250 mL = 750 mL.

What is the boiling point of water on the Fahrenheit temperature scale? a. 0ºF b. 212ºF c. 32ºF d. 100ºF

212ºF

A Fahrenheit thermometer registers 80 degrees F outside. What would a Celsius thermometer read? a. 40ºC b. 32ºC c. 100ºC d. 27ºC

27ºC

1 fluid ounce corresponds to approximately ________ mL a. 960 b. 240 c. 30 d. 10

30

What is the freezing point of water on the Fahrenheit temperature scale? a. 32ºF b. 0ºF c. 100ºF d. 212ºF

32ºF

An acidophile would likely grow best at which of the following pH values? a. 4 b. 8 c. 7

4

The thermometer on a sign indicates that it is 20 degrees Celsius. What is this in degrees Fahrenheit? a. 68 degrees Fahrenheit b. 58 degrees Fahrenheit c. 93.6 degrees Fahrenheit d. 77.8 degrees Fahrenheit e. 12 degrees Fahrenheit

68 degrees Fahrenheit To convert Fahrenheit to Celsius, subtract 32 and then divide by 1.8. To convert Celsius to Fahrenheit, multiply by 1.8 and then add 32. For example 20C x 1.8+32 = 68F.

How many pairs of legs does a pillbug have? a. 10 b. 14 c. 7 d. 8

7

If a sugar was allowed to ferment in a culture medium, what type of organisms would grow best? a. Neutrophiles b. Acidophiles c. Alkaliphiles

Acidophiles Fermentation produces acid, resulting in lower pH values. This would favor the acidophiles.

A good scientific experiment is reproducible. What does this mean? a. The analysis of the experiment is correct. b. Anyone can conduct the same experiment in another lab and expect the same results. c. The experiment has been done many times before with different results each time. d. The experiment is easy to pull off.

Anyone can conduct the same experiment in another lab and expect the same results.

The spectrophotometer measures the transmittance of growth. More light transmittance would mean ________ growth in the sample tube. a. less b. more

less

What is more important: to formulate a believable, testable hypothesis or to develop a good strategy to test the hypothesis accurately? a. The right testing strategy is more important. b. Both the right hypothesis and the right test strategy are very important. c. The right hypothesis is the most important. d. Neither the right hypothesis nor the right test strategy are very important.

The right testing strategy is more important.

What should your hypothesis represent? a. an idea that you know is false b. a possible explanation for a problem or observation c. a statement of something that you know is true d. something that you cannot test

a possible explanation for a problem or observation

The lower the pH, the more ________ the environment. a. alkaline b. neutral c. acidic

acidic

Many bacteria that cause urinary tract infections must be able to withstand the conversion of urea to ammonia in the environment. Therefore, they must be at least tolerant of ________ conditions. a. acidic b. neutral c. alkaline

alkaline The production of ammonia increases the pH, making the environment in the urinary tract more alkaline. Some bacteria are tolerant of this pH rise and can therefore cause UTIs.

Imagine that you wish to compare two different diets that will be fed to tadpoles raised in a lab. One diet is a meat-based fish food, and the other is the traditional diet of boiled lettuce. You want to see if the meat-based diet will be associated with an increase in the average weight of the tadpoles. In your experiment you keep all other factors, such as tadpole density per pan, temperature, pH, and the amount of food the same. The only difference between your control and experimental groups is the type of food the tadpoles receive. What is the independent variable for the tadpole diet experiment? a. lab conditions b. diet c. species of tadpole d. tadpole size

diet

in the metric system what is the base unit for weight?

gram

If a measurement is too large or too small to be conveniently expressed by a base unit, you can use a _____ . a. empirical b. standard c. prefix d. basic

prefix

What instrument did you use to weigh objects in the metric system lab? a. thermometer b. scale c. None of the answer choices are correct. d. ruler e. compass

scale A digital scale was used to measure the weight of sodium chloride powder in grams.

Where can you perform the experiment phase of the scientific method? a. in a science laboratory b. in the cafeteria c. behind a desk d. scientific experimentation can occur anywhere, depending upon the problem being examined

scientific experimentation can occur anywhere, depending upon the problem being examined

In order to come to reliable conclusions about pillbug preferences, you needed to use the a. hypothetical method. b. scientific method. c. pretty graphs and charts. d. modular data method. e. experimental design method.

scientific method

How do pillbugs detect the presence of food? a. hearing b. sight c. touch d. smell

smell