50 Biochemistry Calculations and Viva based on Carbohydrates you must know.

BIOCHEMISTRY CALCULATIONS AND VIVA IN CARBOHYDRATES.

Carbohydrate is a broad subdivision of biochemistry being one of the macromolecules in the body. The following are some calculation questions and answers related to carbohydrates that will make you ace your examinations.

 

  1. Q: What is the molecular formula of glucose?

   A: C6H12O6

 

  1. Q: Calculate the molecular weight of glucose.

   A: 180.16 g/mol

 

  1. Q: How many moles are there in 45 grams of sucrose (C12H22O11)?

   A: 0.125 moles

 

  1. Q: Convert 120 grams of fructose (C6H12O6) into moles.

   A: 0.667 moles

 

  1. Q: If 2 moles of maltose (C12H22O11) are present, how many glucose units does it contain?

   A: 4 glucose units

 

  1. Q: Calculate the percentage composition of carbon in glucose (C6H12O6).

   A: 40% carbon

 

  1. Q: How many oxygen atoms are there in 1 mole of lactose (C12H22O11)?

   A: 11 moles of oxygen atoms

 

  1. Q: If a solution contains 30 grams of sucrose in 500 ml of water, what is its molarity?

   A: 0.1667 M

 

  1. Q: How many calories are obtained from completely burning 1 mole of glucose?

   A: 686 kcal

 

  1. Q: Calculate the reducing sugar content if a sample contains 25 grams of lactose (C12H22O11).

    A: 25 grams (All lactose is a reducing sugar.)

 

  1. Q: A cereal bar contains 15 grams of carbohydrates and 2 grams of fiber. What is the net carbohydrate content?

    A: 13 grams (Net carbs = Total carbs – Fiber)

 

  1. Q: If 75% of the starch is digested in the small intestine, how many grams of a 50g starch serving are absorbed?

    A: 37.5 grams

 

  1. Q: What is the glycemic load of a food with a glycemic index of 45 and 30 grams of carbohydrates per serving?

    A: 13.5 (Glycemic Load = Glycemic Index × Carbohydrates ÷ 100)

 

  1. Q: How many glycosidic bonds are there in maltose (C12H22O11)?

    A: 2 glycosidic bonds

 

  1. Q: A glucose solution contains 10% glucose by mass. How many grams of glucose are in 250 ml of this solution?

    A: 25 grams

 

  1. Q: Calculate the total number of atoms in one molecule of sucrose (C12H22O11).

    A: 45 atoms

 

  1. Q: What is the molar mass of fructose (C6H12O6) in grams/mole?

    A: 180.16 g/mol

 

  1. Q: If 1 mole of galactose (C6H12O6) weighs 180.16 grams, what is the mass of 2 moles of galactose?

    A: 360.32 grams

 

  1. Q: How many chiral centers are there in cellulose (C6H10O5)?

    A: 10 chiral centers

 

  1. Q: What is the empirical formula of ribose if it contains 40% carbon, 53.3% oxygen, and 6.7% hydrogen by mass?

    A: C5H10O5

 

  1. Q: Convert 0.25 moles of lactose (C12H22O11) into grams.

    A: 55 grams

 

  1. Q: What is the percentage of water in honey, given that it contains 80% carbohydrates and has a water content of 20%?

    A: 20% water

 

  1. Q: If 50 grams of sucrose (C12H22O11) are dissolved in 500 ml of water, what is its molality?

    A: 0.833 mol/kg

 

  1. Q: Calculate the energy content of 100 grams of fructose (C6H12O6) in calories.

    A: 387 kcal

 

  1. Q: How many non-reducing ends are there in a linear glucose polymer with 20 glucose units?

    A: 2 non-reducing ends

 

  1. Q: If lactose (C12H22O11) is a reducing sugar and is composed of galactose and glucose, how many reducing ends does it have?

    A: 2 reducing ends

 

  1. Q: What is the osmolarity of a 0.5 M glucose (C6H12O6) solution?

    A: 0.5 osmol/L

 

  1. Q: If 25 grams of maltose (C12H22O11) are fermented, how many ethanol molecules can be produced (C2H5OH)?

    A: 7.5 moles of ethanol

 

  1. Q: What is the molar ratio of carbon to hydrogen to oxygen in glucose (C6H12O6)?

    A: 1:2:1

 

  1. Q: If a starch solution contains 10 grams of starch in 100 ml of water, what is its weight/volume percentage?

    A: 10% (w/v)

 

  1. Q: Calculate the reducing power of a sample containing 5 grams of glucose (C6H12O6).

    A: 5 grams (All glucose is a reducing sugar.)

 

  1. Q: A candy bar contains 20 grams of carbohydrates. What is the energy content in kilojoules (kJ)?

    A: 335 kJ

 

  1. Q: If lactose (C12H22O11) is made up of one molecule of glucose and one molecule of galactose, how many atoms are in a single lactose molecule?

    A: 45 atoms

 

  1. Q: What is the molecular formula of sucrose (table sugar)?

    A: C12H22O11

 

  1. Q: A serving of pasta contains 40 grams of carbohydrates. How many kilocalories does it provide?

    A: 160 kcal

 

  1. Q: Calculate the total number of atoms in one molecule of fructose (C6H12O6).

    A: 24 atoms

 

  1. Q: How many moles of water are produced from the complete combustion of 1 mole of glucose (C6H12O6)?

    A: 6 moles of water

 

  1. Q: If a drink contains 30 grams of sugar (sucrose), what is the total carbohydrate content?

    A: 30 grams (Sucrose is a carbohydrate.)

 

  1. Q: Calculate the energy yield from the oxidation of 1 mole of galactose (C6H12O6) to carbon dioxide and water.

    A: 686 kcal

 

  1. Q: If 10 grams of glucose (C6H12O6) are dissolved in 200 ml of water, what is its molarity?

    A: 0.556 M

 

  1. Q: What is the mass percent of oxygen in lactose (C12H22O11)?

    A: 48.17% oxygen

 

  1. Q: A

 

 solution contains 0.2 moles of sucrose (C12H22O11) in 500 ml of water. What is its molar concentration?

    A: 0.4 M

 

  1. Q: If 1 mole of glucose (C6H12O6) undergoes fermentation to ethanol and carbon dioxide, how many moles of ethanol are produced?

    A: 2 moles of ethanol

 

  1. Q: Calculate the energy content of 50 grams of galactose (C6H12O6) in kilocalories.

    A: 193 kcal

 

  1. Q: How many reducing sugar units are present in 1 mole of maltose (C12H22O11)?

    A: 2 reducing sugar units

 

  1. Q: What is the empirical formula of sucrose if it contains 40% carbon, 6.7% hydrogen, and 53.3% oxygen by mass?

    A: C12H22O11

 

  1. Q: If 100 grams of cellulose (C6H10O5) are fermented, how many moles of ethanol can be produced (C2H5OH)?

    A: 2.22 moles of ethanol

 

  1. Q: A glucose solution contains 5 moles of glucose in 1 liter of water. What is its molarity?

    A: 5 M

 

  1. Q: Calculate the energy yield from the complete combustion of 1 mole of sucrose (C12H22O11).

    A: 5648 kJ

 

  1. Q: If 10 grams of lactose (C12H22O11) are dissolved in 200 ml of water, what is its molality?

    A: 0.333 mol/kg

 

Kindly note that these calculations are based on the provided molecular formulas and constants. Always double-check your calculations and ensure the accuracy of the data used.

 

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