brodidit for students
Biological molecules
Class 11 · Biology · 9 questions
Name: ____________________ Date: ____________
Which element is present in all proteins but not in carbohydrates or fats?
- A Nitrogen
- B Hydrogen
- C Oxygen
- D Carbon
The bond that joins two amino acids is a:
- A Glycosidic bond
- B Hydrogen bond
- C Peptide bond
- D Ester bond
Glucose and fructose are:
- A Disaccharides
- B Polysaccharides
- C Lipids
- D Monosaccharides
Sucrose is made of:
- A Glucose and galactose
- B Two fructose units
- C Two glucose units
- D Glucose and fructose
Which polysaccharide is the storage form of glucose in animals?
- A Glycogen
- B Cellulose
- C Starch
- D Chitin
The sugar in DNA is:
- A Deoxyribose
- B Glucose
- C Fructose
- D Ribose
Triglycerides are made of glycerol and:
- A Three amino acids
- B Three sugars
- C Three nucleotides
- D Three fatty acids
The test for protein is the:
- A Emulsion test
- B Iodine test
- C Benedict's test
- D Biuret test
Benedict's solution is used to test for:
- A Proteins
- B Reducing sugars
- C Lipids
- D Starch
Answer key
1. A, 2. C, 3. D, 4. D, 5. A, 6. A, 7. D, 8. D, 9. B
Amino acids contain an amino group, which carries nitrogen.
Amino acids join by peptide bonds.
They are simple sugars.
Sucrose is a disaccharide of glucose and fructose.
Animals store glucose as glycogen in the liver and muscles.
DNA contains deoxyribose.
Each fatty acid is joined by an ester bond.
Biuret reagent turns purple.
It turns orange or brick red on heating.