Biology Lab 3
denatures
The term that describes the affect that high temperatures have on enzymes is _______________.
Heterotrophic
Organisms are said to be ___________ if they cannot make their own food.
Starch
Plants store glucose in the form of __________.
an enzyme found in saliva necessary for the break down of starch in the mouth
Amylase is ________.
both plant and animal cells
Based on the results observed in the chart, proteins are present in ______.
catabolic reaction produces energy from food
Cellular respiration is _________.
forever
If one adds iodine to milk, how long must one wait for a purplish black color change to occur?
False
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.
Yes
Is Sudan IV soluble in oil?
No
Is Sudan IV soluble in water?
No
Is a lipid soluble in water?
It shows that glucose breaks down into starch molecules. b. It shows that starch breaks down into glucose in the presence of amylase. d. None of these.
What is the purpose of test tube # 3 (containing starch, amylase, iodine and placed in a warm water bath)?
The Benedict's solution indicates the presence of glucose. The Benedict's solution shows that starch breaks down into glucose. Benedict's solution shows that starch breaks down into glucose in the presence of amylase.
What is the role of the Benedict's solution in test tube # 4?
The iodine serves as an indicator of starch. b. The iodine indicates the presence of glucose. c. The iodine indicates the presence of glucose in starch. d. None of these
What is the role of the iodine solution that was added to test tube # 1?
True
When mixed with a lipid, Sudan IV evenly stains the lipid.
nucleic acids
Which of the following biological macromolecules (molecules of life) was omitted from this lab?
Iodine does not test (indicate) for glucose. Starch was not present. Glucose does not contain starch.
Which of the following explains the absence of a color change in test tube #2 that contains 15 drops of glucose solution and 3 drops of iodine?
Sudan IV Greasy spot test
Which of the following indicates for lipids?
Biuret's Reagent
Which of the following indicates for proteins?
Iodine
Which of the following indicates for simple starch?
Benedict's Solution
Which of the following indicates for simple sugars (glucose)?
Test tube # 3
Which of the observed test tubes represent the following reaction? Oil & vinegar dressing + Sudan IV -> Red stain dispersed in oil only
Starch is not present.
Why isn't there a color change to purplish-black when iodine is added to milk?
