Carbohydrates - A Level Biology_2

How many carbon atoms do pentose sugars, such as ribose and deoxyribose, have?

• a) Three
  

• b) Four
  

• c) Five
  

• d) Six

1. Which of the following describes a key characteristic of monosaccharides?

• • a) They always have a sweet taste.

• • b) They contain only one sugar unit.

    Monosaccharide with one sugar unit

• • c) They are always found in fruits.

• • d) They are complex molecules with many atoms.

Which sugar is used to make DNA and has a pentagon shape?

• a) Glucose

• 
  b) Ribose
  

• c) Fructose
  

• d) Galactose

• e) Deoxyribose

What is the shape of hexose sugars, like glucose, fructose, and galactose?

• a) Pentagon
  

• b) Hexagon

• 
  c) Octagon

• 
  d) Triangle

What is the shape of hexose sugars, like glucose, fructose, and galactose?

• a) Pentagon
  

• b) Hexagon

• 
  c) Octagon

• 
  d) Triangle

How many carbon atoms are present in the ribose molecule?

• 3
• 7
• 10
• 5

What shape does ribose typically form?

• Square
• Circle
• Pentagon
• Triangle

Which functional group characterizes carbon number 5 in ribose?

• Carbonyl group (C=O)
• Hydroxyl group (OH)
• Amino group (NH2)
• Phosphate group (PO4)

In what type of nucleic acid is ribose a component?

• RNA
• Lipid
• Protein
• DNA

What is the primary function of ribose in nucleic acids?

• Acts as a catalyst for chemical reactions
• Stores genetic information
• Provides energy for cellular processes
• Forms the backbone of RNA