CBSE Class 12 (Science) Biomolecules — practice questions
90 free MCQs with worked solutions. Tap any question for the answer + explanation, or practice them all in the app.
Practice CBSE Class 12 (Science) Biomolecules in the app →Glucose in open-chain form has a:The disease scurvy results from deficiency of:In DNA, the complementary base pair to adenine (A) is:Carbohydrates are defined as optically active polyhydroxy:Carbohydrates are also known by which other name?A carbohydrate that cannot be hydrolysed further is a:Oligosaccharides give on hydrolysis how many monosaccharide units?Polysaccharides are also called non-sugars because they are not:Sugars that reduce Tollens' reagent are called:A monosaccharide holding an aldehyde group is called an:Glucose is an aldohexose also known as:Prolonged heating of glucose with hydrogen iodide gives:Glucose oxidised by bromine water yields:Oxidation of glucose with nitric acid gives:Glucose pentaacetate shows that glucose carries how many hydroxyls?Commercial glucose is obtained by hydrolysing starch at:The carbon whose hydroxyl decides alpha or beta glucose is called:The six membered ring form of glucose is called the:Fructose is best described as a:The five membered ring form of fructose is called the:Two monosaccharides joined through an oxygen atom share a:Sucrose is a non reducing sugar because both its:The laevorotatory mixture left after hydrolysing sucrose is called:Maltose on hydrolysis gives two units of:Lactose, the sugar of milk, is built from glucose and:The water soluble component of starch is:Amylopectin makes up roughly what share of starch?Cellulose is a straight chain polymer built only from:Carbohydrate is stored in the animal body as:All proteins are polymers of which kind of amino acid?The word protein comes from a Greek word meaning:Amino acids the body cannot make and must eat are called:The dipolar ion form of an amino acid is called a:Which amino acid is not optically active?Most naturally occurring amino acids carry which configuration?The bond joining two amino acids in a protein is a:A chain of more than ten amino acids is called a:Keratin and myosin are examples of which class of protein?Insulin and albumin are examples of which class of protein?The sequence of amino acids in a chain is its:The alpha helix and the beta pleated sheet belong to which level?The arrangement of sub-units in a protein is its:On denaturation a protein loses which structures?The coagulation of egg white on boiling is an example of:Almost all enzymes are which kind of protein?The name of an enzyme almost always ends in:Enzymes speed a reaction by lowering its:Which set of vitamins is fat soluble?Water soluble vitamins must be eaten regularly because they are:The sugar found in a DNA molecule is:Which base occurs in RNA but not in DNA?A base attached to a sugar without phosphate is called a:Nucleotides in a chain are joined by which linkage?In the DNA double helix adenine pairs with:Boiling sucrose with dilute HCl in alcoholic solution gives which products?Commercially, glucose is made by boiling starch under pressure with which acid?Despite its aldehyde group, glucose fails which of these tests?What is the melting point of the alpha form of glucose?The alpha and beta anomers of glucose differ in configuration at which carbon?Which compound gives its name to the six-membered ring form of glucose?At which carbon atom does fructose carry its ketonic group?How many atoms make up the ring in the cyclic furanose form of fructose?What is the linkage between two monosaccharides through an oxygen atom called?Sucrose hydrolysis changes the sign of rotation from dextro to laevo. The product is called what?Which disaccharide gives two molecules of glucose alone on hydrolysis?Which disaccharide is commonly known as milk sugar?In lactose, C1 of galactose is linked to which carbon of glucose?Which component of starch is water soluble and unbranched?Branching in amylopectin occurs through which type of glycosidic linkage?Which polysaccharide is the predominant constituent of plant cell walls?Which polysaccharide is also called animal starch?Which amino acid is named from a Greek word for sweet taste?What makes an amino acid essential?An amino acid with more carboxyl groups than amino groups is classified as what?Which naturally occurring alpha-amino acid is optically inactive?The peptide linkage is chemically which functional group?How many amino acids does insulin contain?A polypeptide is called a protein when its molecular mass exceeds roughly what?Which fibrous protein is present in hair and wool?Which description fits globular proteins such as albumins?In an alpha-helix, the polypeptide chain twists into which kind of screw?Which protein structure level stays intact during denaturation?Almost all enzymes belong to which class of biomolecules?Which enzyme catalyses the hydrolysis of maltose into glucose?What is the activation energy for sucrose hydrolysis when catalysed by sucrase?Why was the name vitamine originally coined?Which water soluble vitamin can be stored in the body?Fragile red blood cells and muscular weakness point to a lack of which vitamin?Which base in RNA takes the place of thymine found in DNA?In the DNA double helix, adenine pairs through hydrogen bonds with which base?