Principles of Biology I Lab 3

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Lipids indicators

Greasy spot test

Which of the following indicates for lipids?

Sudan IV & Greasy Spot test

Which of the observed test tubes represent the following reaction?Oil & vinegar dressing + Sudan IV --> Red stain dispersed in oil only

Test tube # 3

In the presence of glucose, Biuret's reagent changes from blue to purple in color.

False

In the presence of protein, iodine changes to a purple color.

False

In the presence of starch, Benedict's solution changes from blue to orange or brick red in color

False

When mixed with a lipid, Sudan IV evenly stains the lipid.

True

Positive iodine test

dark purplish-black

The term that describes the affect that high temperatures have on enzymes is

denatures

Which of the following biological macromolecules (molecules of life) was omitted from this lab?

nucleic acids

Which of the following contains starch?

potato juice

Which of the following did not contain proteins?

potato juice

Soy beans only contain:

proteins

Which test requires a hot water bath in order to see a reaction?

simple sugars

Why isn't there a color change to purplish-black when iodine is added to milk?

starch is not present

Is a lipid soluble in water?

No

Milk does not contain

Starch

Plants store glucose in the form of

Starch

Which of the following indicates for simple sugars (glucose)?

Benedict's solution

simple sugars indicator

Benedict's solution

Protein indicator

Biuret's reagent

Which of the following indicates for proteins?

Biuret's reagent

Proteins are present in

Both plant and animal cells

Positive simple sugar test

Brick red/orange

Starch indicators

Iodine

Which of the following indicates for simple starch?

Iodine

Is Sudan IV soluble in oil?

Yes

Positive lipid test

greasy spot on brown paper

Positive protein test

lavender purple


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