Testing for Biochemicals

Which of the following does not consist of organic molecules?

• Carbon dioxide

• Starch

• DNA

• Lipids

Choose the elements that make up a protein molecule

• Carbon

• Hydrogen

• Oxygen

• Phosphorus

• Nitrogen

Tags

NGSS.HS-LS1-6

Carbon, hydrogen, oxygen, nitrogen, phosphorus.

These are elements in.....

• proteins

• nucleic acids

• glucose

• lipids

Tags

NGSS.HS-LS1-6

Organic molecules are molecules that must contain the elements ............... and ................... .

Choose the correct answers that fill in the blanks.

• Oxygen

• Carbon

• Nitrogen

• Hydrogen

Tags

NGSS.HS-LS1-6

What is not the function of proteins?

• Make antibodies

• Form body tissues

• Source of energy

• Thermal insulation of body

What is not a reducing sugar?

• glucose

• fructose

• maltose

• starch

What is the reagent to test for reducing sugars?

• DCPIP

• Iodine

• Benedict's reagent

• Biuret reagent

What is the reagent to test for the presence of starch?

• DCPIP

• Iodine

• Benedict's reagent

• Biuret reagent

When Biuret solution is added to a food sample, the mixture turns from blue to purple.

What does this show?

• Reducing sugar is present

• Protein is present

• Lipids are present

• Starch is present

How does one test for the presence of lipids in a food sample?

• Mix the food sample with DCPIP

• Mix the food sample with ethanol

• Mix the food sample with ethanol and then water

• Mix the food sample with DCPIP and then water