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Lactose, a sugar in milk, is composed of one glucose molecule joined by a glycosidic linkage to one galactose molecule. How is lactose classified?


A) as a hexose
B) as a disaccharide
C) as a polysaccharide
D) as a pentose
E) as a monosaccharide

F) D) and E)
G) A) and B)

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Carbohydrates have been shown to form


A) only in biotic conditions inside living cells) .
B) in biotic and abiotic conditions, including outer space.
C) in biotic and abiotic conditions, but only if nucleotides and RNA have already formed.
D) only in biotic conditions, when enough free energy is available to allow their formation.

E) A) and D)
F) A) and B)

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