Principles Of Biology Midterm Practice

The best source of information regarding the hazards posed by any chemical and specific handling instructions is the

Safety Data Sheet (SDS)

Some students consume large amounts of coffee and so called energy drinks to help them stay alert when studying. You notice that many who engage in this seem to do poorly on exams. Suppose you want to investigate the relationship between caffeine consumption and exam performance. Which of the following statements would be an appropriate hypothesis?

Students who consume large amounts of caffeine while studying will have lower exam scores than those who consume less caffeine.

If you wanted to test whether or not a particular pain reliever was effective in the general population, you would need to design an experiment with an experimental group and a control group. What should be the only difference between these two groups?

Treatment: The experimental group should get the pain reliever, and the control should get a placebo.

When can you bring food and beverages into the lab?

You are never allowed to do so.

In a catalase-controlled experiment, the negative control can be shown by

a mixture of hydrogen peroxide and water

A disinfectant is used on your work surface

after all work is complete before the beginning of laboratory procedures after any spill of microorganisms

What are the building blocks of proteins?

amino acids

When measuring the volume of a liquid in a graduated cylinder, at which point should the measurement be taken?

at the meniscus

In the weight exercise of the metric system lab, what object/materials did you practice weighing?

beaker and salt

To prove that starch is found in a food you could test it with _____ solution.

benedict's

Which of the following reagents is best suited for the detection of sugar?

benedict's

Which reagent is sued toe detect the presence of simple sugars?

benedict's

Dissection specimens and bacterial culture plates should be discarded into a __ bin when you are finished with them.

biohazard

Which is the most appropriate disposal for a swab used to culture your throat during lab?

biohazard bag

Which of the following reagents is best suited for the detection of protein?

biuret

Which reagent is used to detect the presence of protein?

biuret

Which of the following tests is best suited for the detection of fat and oils?

brown paper

Starch is classified as a

carbohydrate

The base unit for temperature in the metric system is

celsius

Which part of the microscope will be used first to adjust the focus when starting with the lowest power lens?

coarse focus

What is enhances when a stain is used to make a sample, or parts of a sample, darker than the background in a slide?

contrast

Which of the following is defined as the ability to distinguish an object from the background?

contrast

Which of the following should be autoclaved after working in the lab?

glass bacterial culture tubes

The optimum condition for an enzyme

is where it works best

To protect your skin and closing from hazards such as chemical and infectious organisms, what should be worn at all times in the lab?

lab coat

Which of these items can be placed in the regular trash can or recycle container?

lab notes that are no longer needed

The base unit of fluid volume in the metric system is the

liter

The base unit of liquid in the metric system is the

liter

A change in what component of microscopy influences the apparent size of the objects being viewed?

magnification

Which of the following is defined as the ability to make an object appear larger?

magnification

The base uint of length in the metric system is the

meter

In the length exercise, what tool did you use to measure the circle?

metric ruler

What are the building blocks of carbohydrates?

monosaccharides

To convert a larger unit of measure to a smaller one you would __ a factor.

multiply by

In which circumstance is food and/or beverage allowed in the laboratory?

never

The lens on the microscope that is primarily responsible for the magnification of the specimen is the __ lens.

objective

The __ lenses further magnify the image produced by the objective lens.

ocular

a given enzyme works on

one type of substrate

Starch, cellulose, glycogen, and polypeptides are all made from chains of many subunits, or building blocks. What is the name given to a chain composed of many subunits?

polymer

The purpose of lab safety rules and protocols is to

protect everyone in the lab from injury and infection.

In the pillbug experiment, the substance used as the control was

sand

There are two, two-sided dishes in the pillbug experiment. In one dish, you should have placed sand in both sides. In the other dish, you should have placed __ in one side and __ in the other side.

sand; cornstarch

What instrument did you use to weight objects in the metric system lab?

scale

Slides, scalpels, razor blades, cover glasses, and capillary tubes are all classified as

sharps

Where should glass slides, pipettes, and capillary tubes be disposed?

sharps container

Soap should be applied to ___ hands.

wet

When enzyme activity rate has reached stability, an increase in the enzyme concentration will

will not make any difference in the enzyme rate

47.0 miligrams =

0.047 grams 0.47 decigrams 4.7 centigrams

Assume you drink 250 mL of soda out of a 1 liter soda bottle. How many liters are left?

0.75 liters

In the pillbug experiment, how many pillbug did you need to use to get god information for the experiment?

10

The conversion between base units and derived units in the metric system are based on a factor of

10

How many centimeters are in a meter?

100

If a specimen was being viewed using a 100x objective and a 10x ocular, what would be the total magnification?

1000x

How long should hands be lathered while washing?

20 seconds

If a specimen was being viewed using a 20x objective lens and a 10x ocular lens, what would be the total magnification?

200x

Changing the pH will have the following effects on a catalase-controlled reaction:

Increasing or decreasing the pH above or below the optimum level will decrease the activity.

Why is it important to use the tare function when weighing an object placed in a beaker?

It allows you toe wight the object and disregard the beaker.

In the pillbug experiment, if the pillbug in the experimental chamber would have moved to the side of the chamber with sand instead of cornstarch, what would you have concluded?

Pillbug tend to prefer sand over cornstarch.

While testing an unknown solution, a student adds Benedict's reagent and watches as the content of the test tube turn green. The student then added amylase and heats the test tube. This causes the contents to turn red. Which of the following conclusions could the student make?

the solution has both simple sugars and starch