Question

Which of the following contain $\alpha$-D-glucose units?
a) cane sugar b) milk sugar c) cellulose d) amylose

• A. a, d
• B. a, b
• C. b, c
• D. c, d

Hint:

Remember: Starch (amylose and amylopectin) and sucrose contain $\alpha$-D-glucose, while cellulose and lactose contain $\beta$-D-glucose.

Answer 1

The Correct Option is A

Step 1: Understand the structure of each compound. 
- Cane sugar (sucrose) is composed of glucose and fructose, and includes an $\alpha$-D-glucose unit. 
- Amylose is a component of starch formed by $\alpha$-D-glucose units. 
- Milk sugar (lactose) contains $\beta$-D-glucose, not $\alpha$. 
- Cellulose is made of $\beta$-D-glucose units. 
Step 2: Identify correct options. 
Only cane sugar (a) and amylose (d) contain $\alpha$-D-glucose units.