Bihar Board 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 Bihar Board 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:Which carbohydrate does not fit the general formula Cx(H2O)y?Which compound fits the formula Cx(H2O)y but is not a carbohydrate?Why are polysaccharides also called non-sugars?Bromine water oxidises glucose to gluconic acid. This shows glucose hasNitric acid oxidises glucose to saccharic acid. This revealsWhat is the melting point of the α-form of glucose?The OH group on which carbon of glucose forms its six-membered ring?The α and β anomers of glucose differ in configuration at which carbon?In fructose, the ketonic group is present at which carbon number?In sucrose, the glycosidic bond joins which carbon atoms?Invert sugar is laevorotatory because fructose has a specific rotation ofBranching in amylopectin occurs through which linkage?Glycogen is called animal starch because its structure resemblesThe amino acid glycine is named after which property?Which of these is a globular protein?In an α-helix, the polypeptide chain twists into aThe original term vitamine joined the word vital withWhich water soluble vitamin can be stored in the human body?A nucleoside forms when a base attaches to which position of the sugar?In which year did Har Gobind Khorana share the Nobel Prize?Who shared the 1962 Nobel prize with Watson and Crick for DNA structure?Thyroxine is an iodinated derivative of which amino acid?Which hormone tends to raise the glucose level in blood?Which adrenal cortex hormones control water and salt excretion by the kidney?D and L notation in sugars relates configuration to which compound?Which fact about glucose cannot be explained by its open chain structure?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?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?Which disaccharide gives two molecules of glucose alone on hydrolysis?In lactose, C1 of galactose is linked to which carbon of glucose?A polypeptide is called a protein when its molecular mass exceeds roughly what?What is the activation energy for sucrose hydrolysis when catalysed by sucrase?