Lesson 2.1.2b
2.1.2b Lipids, amino acids and proteins Quiz: OCR Biology, Unit 1
20 questions
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Lesson 2.1.2b, Lipids, amino acids and proteins: 20 multiple choice questions for the OCR Biology (H020), Unit 1: Foundations in biology, written with Revision Ninja.
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The 20 questions
-
Triglycerides are formed from one glycerol molecule and three:
- Amino acids
- Nucleotides
- Monosaccharides
- Fatty acids
-
What type of bond links fatty acids to glycerol in a triglyceride?
- Glycosidic bonds
- Peptide bonds
- Phosphodiester bonds
- Ester bonds
-
What chemical group forms the hydrophilic head of a phospholipid?
- Methyl group
- Amino group
- Carboxyl group
- Phosphate group
-
What variable chemical group distinguishes different amino acids from each other?
- Ester bond
- Phosphate group
- R group
- Hydroxyl group
-
The bond between two amino acids in a dipeptide is a:
- Glycosidic bond
- Ester bond
- Peptide bond
- Hydrogen bond
-
Which level of protein structure is the sequence of amino acids?
- Secondary
- Quaternary
- Tertiary
- Primary
-
Collagen, keratin and elastin are examples of:
- Conjugated proteins
- Globular proteins
- Fibrous proteins
- Inorganic ions
-
Which level of protein structure involves hydrogen bonds forming alpha helices and beta pleated sheets?
- Secondary
- Primary
- Tertiary
- Quaternary
-
What non-protein prosthetic group is found in a haemoglobin molecule?
- Carbohydrate chain
- Magnesium ring
- Haem group
- Nucleic acid
-
What colour change indicates a positive biuret test for proteins?
- Purple
- Brick red
- Blue
- Yellow
-
Which molecule is a major component of animal cell membranes alongside phospholipids?
- Triglyceride
- Cholesterol
- Cellulose
- Glycogen
-
What observation confirms the presence of lipids in the emulsion test?
- Purple solution
- Effervescence
- Green precipitate
- Cloudy white layer
-
What are the products of complete triglyceride hydrolysis?
- Glycerol and fatty acids
- Glycogen and fatty acids
- Glycerol and amino acids
- Glucose and amino acids
-
Which chemical feature makes triglycerides efficient energy-storing molecules?
- High nitrogen content
- Soluble in water
- Ionic bonds
- Many C-H bonds
-
What structural feature is absent in saturated fatty acids?
- Carbon atoms
- Carboxyl groups
- Carbon-carbon double bonds
- Hydrogen atoms
-
How do phospholipid heads orient in cell membranes?
- Heads outward
- Heads parallel to tails
- Heads inward
- Heads clustered centrally
-
Which covalent bond in tertiary structure is most resistant to heat-induced breakage?
- Disulfide bonds
- Hydrophobic interactions
- Ionic bonds
- Hydrogen bonds
-
What is the typical physical property of fibrous proteins like collagen?
- Gaseous and reactive
- Insoluble and structural
- Liquid and volatile
- Soluble and catalytic
-
Why do different triglycerides have varying physical properties?
- Different fatty acids
- Different glycerol units
- Different pentose sugars
- Different amino acids
-
Which protein level of structure is most directly altered by a changed amino acid sequence?
- Secondary structure
- Primary structure
- Tertiary structure
- Quaternary structure
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