Lab Missed Questions-Midterm

lipids

which category of macromolecules is classified as a group based upon insolubility in w

1.4

14 millimeters corresponds to __ centimeters.

25.84 meters

2584 centimeters corresponds to __ meters.

586

58.6 centimeters corresponds to __ millimeters.

black

A positive reaction for the iodine test for starch is indicated by a(n) __ color.

purple

A positive reaction for the presence of protein using the Biuret test would be __ in color.

autoclave

After they are used, reusable instruments or glassware that require sterilization should be placed in the

you could drag the 40x objective lens through the oil making it dirty

After viewing a slide under oil immersion, what could happen if you rotated the nosepiece the wrong direction before removing the slide?

False

An enzyme at its optimum pH will produce a column of bubbles that is higher than when it is not at its optimum pH because it is less active.

false

An enzyme at its optimum pH will produce a column of bubbles that is higher than when it is not at its optimum pH because it is less active. (True or False)

Infectious Microorganisms and corrosive chemicals

What does a lab coat protect against?

False

When the enzyme catalase is mixed with the substrate water, oxygen bubbles are produced. (true or false)

Omnivore

Which best describes the diet of pillbugs? Omnivore, Herbivore, or Carnivore?

gills

Which best describes the pillbug's organ of respiration?

Nucli

Which of the following are found in both plant and animal cells? -cell walls -nucli -centrioles -chloroplasts

1,2,3 and 6

Which of the following are functions of proteins? Select all that apply. -they are a main storage molecule for energy -they can be for signaling -they can be structural -they act as catalysts -they are a main storage molecule for carbon -they act to slow down chemical reactions -they can play a role in the immune system

2 and 3

Which of the following are phases in LearnSmart Labs' 4-phase model of the scientific method? Select all that apply -evaluation -hypothesis -experiment -science

beaker and scapel

Which of the following could be a potential danger to a student during a dissection? Choose all that apply. mouse, beaker, scapel, and dissection tray

1/1000

Which of the following is the correct meaning of the prefix "milli"?

4

Which of the following is the major difference between proteins, polypeptides and peptides? -type of monomer used -site of synthesis -type of bonds holding amino acids together -length

centrioles

Which of the following structures is present in animal cells but not plant cells?

it will increase

If you have a constant amount of substrate and add an increasing concentration of enzyme, what will happend to the rate of reaction?

constructing membranes

In addition to storing carbon and energy, what else are lipids used for in cells?

wet mount

The __ __ preparation allows one to observe the behavior and movement of microorganisms with a light microscope. (two words)

resolution

The ability to distinguish fine detail in a cell is __.

inside

The epidermal cells of an onion are found on the __ of each layer.

3 and 4

The functions of lipids include which of the following? Select all that apply. -construction of cell walls in plants -catalysis -construction of membranes -storage of energy

ionic

The pH of an enzyme solution can alter the shape of the enzyme and its active site by affecting __ bonding.

240

1 cup corresponds to approximately __ mL.

2

Approximately how many quarts of soda are in a 2 liter bottle?

1 and 2

At very high temperatures enzymes can exhibit less activity or none at all. Which of the following could explain this? Select all that apply. -the enzyme has denatured and cannot interact with the substrate -the active site has changed shape so that the substrate can not fit -he enzyme vaporizes and the solution now only contains substrate

7

Catalase has an optimum pH of

tube 3

Consider the following experiment: Test tube 1 contains 1 mL of catalase and 1 mL of hydrogen peroxide. Test tube 2 contains 1 mL of catalase and 2 mL of hydrogen peroxide. Test tube 3 contains 1 mL of catalase and 4 mL of hydrogen peroxide. If the concentration of the substrate is the limiting reaction rate, which tube is expected to produce the highest column of bubbles?

denutaration

Enzymnes heated up at very high temperatures can lose activity due to which of the following?

3 and 4

How are the metric units of measurement different that the standard system used in the U.S.? Select all that apply. -All scientific research reports in standard units -the standard system is much more precise -metric units are based on multiples of 10 -the metric system is used in more countries world wide

smell

How do pillbugs detect the presence of food?

it moves away

How does the pillbug react when confronted with a noxious substance?

20 seconds

How long should you scrub your hands when washing them?

1

How many cubic centimeters is 1 milliliter?

0.0022

How many pounds are in 1 gram?

1,3, and 4

Hydrogen peroxide is broken down to produce water and oxygen with the help of the enzyme catalase. Which of the following can be measured to determine the enzymatic activity? Select all that apply. -how much oxygen is produced -how much catalase is used -how much hydrogen peroxide is used -how much water is produced

1, 2, and 3

Hydrogen peroxide is broken down to produce water and oxygen with the help of the enzyme catalase. Which of the following can be measured to determine the enzymatic activity? Select all that apply. -how much oxygen is produced -how much water is produced -how much hydrogen peroxide is used -how much catalase is used

decrease

If catalase is present in excess, reducing the amount of hydrogen peroxide in the reaction mix will __ the reaction rate.

catalase samples are either heated or cooled

In the enzyme experiment, how was the temperature of the catalase reaction controlled?

1 and 2

In the enzyme experiment, what were the reasons to measure the height of the bubble column exactly 20 seconds after combining the catalase with the hydrogen peroxide? Select all that apply. -the timing must be standardized between the tubes -at shorter or longer times, the differences in enzyme -concentration might not correlate to bubble height -catalase molecules get used up after 20 seconds -bubbles of oxygen stop forming after 20 seconds

amylase

In the starch composition experiment, the enzyme pancreatic __ was used to hydrolyse starch to glucose.

more

Increasing the concentration of enzyme results in __ substrate interacting with the enzyme per unit volume.

the concentration of substrate is limiting the rate

Increasing the concentration of hydrogen peroxide will increase the reaction rate of catalase if which of the following is true?

4

Increasing the concentration of hydrogen peroxide will increase the reaction rate of catalase if which of the following is true? -the concentration of enzyme is limiting the rate -there is too much water in the catalase -the enzyme is denatured -the concentration of substrate is limiting the rate

starch

Plants store glucose as __.

2 and 3

Scientific results that have undergone tests are (select all that apply) -automated -reproductible -systematic -certified

2 and 4

Which of the following unexpected results could occur if you used the catalase before it had a chance to reach your experimental temperature? Select all that apply. -in the experiment with the over heated enzyme, you would get no enzyme activity -in the experiment with the cooled enzyme, you would get a higher bubble column that expected -in the experiment with the cooled enzyme, you would get no enzyme activity -in the experiment with the over heated enzyme, you would get a higher bubble column than expected

1,2, and 3

Which topics belong in a scientific paper? Select all that apply. -results -introduction -procedures -core concepts

protozoa

Which type of eukaryotic unicellular organisms are more animal like in that they lack a cell wall and obtain nutrients by engulfing food particles?

dirt and other contaminants can be trapped under these items

Why should you remove your watch and jewelry when washing your hands?

under low power, center the object to be viewed before switching to high power

You have successfully focused an object at the edge of the field fo view under low power magnification You rotate to the 40x objective lens and increase illumination, but dont see the object. What is the most likely solution?

iodine

__ is used to detect the presence of starch.