Tag: food and it's constituents
Questions Related to food and it's constituents
Which among the following is the most common monomer of carbohydrate?
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Glucose
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Fructose
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Sucrose
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Maltose
Most common monomer used in polysaccharides is glucose. For example, starch, cellulose, glycogen all are polymers derived from glucose. Plants synthesize carbohydrates as glucose or fructose and store in other form like starch. The type of linkage between glucose molecules is different in storage and structural polysaccharides. The linkage in storage polysaccharides is $\alpha$- whereas $\beta$-linkage is present between glucose molecules in structural polysaccharides.
Cellulose is a
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A liquid
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A protein
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A polysaccharide
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An amino acid
Plant cell is characterised by presence of a cellulosic cell wall which is dead at maturity. The cellulose is a structural polysaccharide made up of glucose molecules linked by $\beta$-glycosidic linkage.
The enzyme which hydrolyses starch to maltose is
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Lactase
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Protease
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Maltase
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Amylase
Hydrolases catalyse hydrolytic reactions. Some of the important hydrolases includes amylases, sucrase, lactase, maltase, protease, esterase etc.
The ratio between hydrogen and oxygen in carbohydrate is
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$5 : 1$
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$4 : 3$
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$3 : 1$
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$2 : 1$
${C} _{n}{H} _{2n}{O} _{n}$ is the formula of
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Fatty acid
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Fat
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Glycerol
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Carbohydrate
CnH2nOn is a general formula of monosaccharides. Monosaccharides are the simplest carbohydrates which cannot be hydrolyzed into smaller units. They usually have 3-7 carbon atoms per molecule. They are the compounds of carbon, hydrogen, and oxygen in which hydrogen and oxygen occur in the ratio of 2:1 as in a molecule of water. Thus, they are also known as hydrates of carbon.
Which of the following is a disaccharide?
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Glucose
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Lactose
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Starch
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Galactose
Disaccharides are oligosaccharides which are formed by condensation of two monosaccharides. Lactose is a disaccharide. It is made up of two hexose molecules, glucose, and galactose. Lactose is also known as milk sugar because it is found in milk. It is a reducing sugar. Thus, the correct answer is B
Which of the following sugars cannot be hydrolysed further to yield simple sugars?
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Ribose
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Maltose
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Sucrose
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Lactose
Carbohydrates which cannot be hydrolyzed further into smaller components are called monosaccharides or simple sugar. Ribose is a sugar which cannot be hydrolyzed further as it is a smaller sugar with 5 carbon. Maltose, Sucrose, and Lactose are complex sugar which can be hydrolyzed into a smaller unit of sugars. Thus, the correct option is A.
Which one of the following is not an oligosaccharide?
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Insulin
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Maltose
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Sucrose
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Raffinose
Insulin is a peptide hormone which helps to maintain the blood sugar level. it is secreted by the beta cells of pancreas.
Which of the following groups contains all polysaccharides?
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Glycogen, sucrose and maltose
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Sucrose, glucose and fructose
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Maltose, lactose and fructose
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Glycogen, cellulose and starch
The complex carbohydrates which are formed by polymerization of a large number of monosaccharides(more than 9 ). They are also known as glycans. Sucrose, Lactose, and maltose are disaccharides. Glucose and fructose are monosaccharides. Glycogen, cellulose, and starch are polysaccharides. Thus, the correct answer is D.
Which is structural polysaccharide?
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Glycogen
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Chitin
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Keratin
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Pectin
Chitin is the most abundant organic substance. It is a complex carbohydrate which is found in fungal walls as a structural component. It is also called as fungal cellulose. It provides strength and elasticity. Thus, the correct answer is B.