Question

1. which of these structures are an example of a carbohydrate? (1 point)

a.
h₂n-$stackrel{h}{c}$-$stackrel{o}{c}$-oh
|
r

b.
(structure: pentagon with ch₂oh, ho, oh groups)

c.
(structure: pentagon with ho, oh and a nitrogen - containing ring)

d.
-$stackrel{h}{c}$-$stackrel{h}{c}$-$stackrel{h}{c}$-$stackrel{h}{c}$-$stackrel{h}{c}$-$stackrel{h}{c}$-$stackrel{h}{c}$-$stackrel{h}{c}$-

h h h h h h h h

options:
○ a
○ b
○ c
○ d

Explanation:

• Option A: Amino acid structure (has -NH₂ and -COOH), not carbohydrate.
• Option B: Monosaccharide (sugar) structure, carbohydrates are sugars/polysaccharides, so this fits.
• Option C: Nucleotide (has nitrogenous base, sugar, phosphate), not carbohydrate.
• Option D: Hydrocarbon chain (lipid - fat), not carbohydrate.

Answer:

B. The structure with multiple -OH groups and a sugar - like ring (monosaccharide, a carbohydrate).