Principles of Biology I Lab 3
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
