Save
Busy. Please wait.
or

show password
Forgot Password?

Don't have an account?  Sign up 
or

Username is available taken
show password

why


Make sure to remember your password. If you forget it there is no way for StudyStack to send you a reset link. You would need to create a new account.
We do not share your email address with others. It is only used to allow you to reset your password. For details read our Privacy Policy and Terms of Service.


Already a StudyStack user? Log In

Reset Password
Enter the associated with your account, and we'll email you a link to reset your password.
focusNode
Didn't know it?
click below
 
Knew it?
click below
Don't know
Remaining cards (0)
Know
0:00
share
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.

  Normal Size     Small Size show me how

Bio Molecules Tests

QuestionAnswer
What is the test for starch? Add potassium iodide to a sample, colour change will be from yellow-brown to blue-black. I2 forms a tri-iodide ion that slips into the middle of the amylose helix.
What is the test for reducing sugars? Heat with Benedicts solution (Copper II Sulphate), colour change will be from blue to brick red. Cu2+ reduced to Cu+ forming Copper Oxide.
What is the test for non-reducing sugars? Test for reducing sugar, if negative proceed to boil sample with HCl to hydrolyse into the monomer. Cool this and add Hydrogencarbonate. Test for reducing sugars again.
What is the test for lipids? Mix sample thoroughly with ethanol to put the lipid into solution. Filter and pour solution into water in a clean test tube. A cloudy white emulsion indicates presence of lipids.
What is the test for proteins? Place sample of food into a spotting tile well, add Sodium Hydroxide then Copper Sulfate. Colour change will be from blue to lilac. Colour is formed by complex between Nitrogen atoms and Cu2+ ions.
What is the quantitative test for reducing sugars? Use the centrifuge to seperate the precipitate and the supernatant, then use pipette to place supernatant into a curvette. Place curvette into the colorimeter and use a red filter to measure percentage transmission. Create calibration curve.
Created by: katieappleton
 

 



Voices

Use these flashcards to help memorize information. Look at the large card and try to recall what is on the other side. Then click the card to flip it. If you knew the answer, click the green Know box. Otherwise, click the red Don't know box.

When you've placed seven or more cards in the Don't know box, click "retry" to try those cards again.

If you've accidentally put the card in the wrong box, just click on the card to take it out of the box.

You can also use your keyboard to move the cards as follows:

If you are logged in to your account, this website will remember which cards you know and don't know so that they are in the same box the next time you log in.

When you need a break, try one of the other activities listed below the flashcards like Matching, Snowman, or Hungry Bug. Although it may feel like you're playing a game, your brain is still making more connections with the information to help you out.

To see how well you know the information, try the Quiz or Test activity.

Pass complete!

"Know" box contains:
Time elapsed:
Retries:
restart all cards