# DBT JRF 2020 — Question 80

Exam: DBT JRF 2020 · Section: B · Topic: Biochemistry · Difficulty: Easy

## Question

Which of following is a trisaccharide?

## Options

- **A.** cellobiose
- **B.** kestose
- **C.** trehalose
- **D.** mannose

## Answer

Option B

## Explanation

Saccharide classification by number of monosaccharide units: Monosaccharide (1 unit): Mannose (hexose, aldose). Disaccharides (2 units): Trehalose ( $\alpha$ -Glc- $\alpha$ -Glc, non-reducing); Cellobiose ( $\beta$ -Glc- $\beta$ -Glc, $\beta$ -1,4-linked, reducing). Trisaccharides (3 units): Kestose ( $\alpha$ -Glc- $\beta$ -Fru- $\beta$ -Fru or $\alpha$ -Glc-1,2- $\beta$ -Fru-1,6-Fru depending on isomer — a fructooligosaccharide/FOS). Raffinose (Gal-Glc-Fru) is another common trisaccharide. Therefore kestose = trisaccharide.

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