Biology · Chemistry

Carbohydrates and Biomolecules

1,073 Questions

Carbohydrates and biomolecules questions test your understanding of sugars, monosaccharides, and metabolic substrates. The topic covers food transportation in plants and the biochemical properties of sweeteners. Practicing these questions builds a strong foundation for exam preparation.

Disaccharides and monosaccharidesArtificial sweetenersGlycogen storagePlant food transportGlycoprotein hormones

Carbohydrates and Biomolecules Questions

Multiple choice evs food trends need for nutrients nutrition and its deficiency nutrition and its need balanced diet and malnutrition balanced and unbalanced food digestive disorders diseases caused by changes in lifestyle diseases and toxic substance health and its maintenance

Carbohydrates are generally called as saccharides.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Carbohydrates (also called saccharides) are molecular compounds made from just three elements: carbon, hydrogen and oxygen. Monosaccharides (e.g. glucose) and disaccharides (e.g. sucrose) and polysaccharide (starch). They are often called sugars.

So, the correct option is 'True'.

Multiple choice evs food components and nutrition need for nutrients nutrition and its deficiency nutrition and its need

Carbohydrate is made up of all except

  1. Carbon

  2. Nitrogen

  3. Oxygen

  4. Hydrogen
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Carbohydrates, as the name suggests, are the hydrates of carbon and thus are made up of molecules of hydrogen, oxygen and carbon.

These are generally represented as Cx(H₂O)y. 
These are the essential constituents of all the living beings.
So, the correct option is 'Nitrogen'

Multiple choice chemistry introduction to analytical chemistry percent composition water of crystallisation percentage composition and empirical formula

Compound Q contains $40\%$ carbon by mass.
What could Q be?
$1$. glucose, $C _6H _{12}O _6$
$2$. starch, $(C _6H _{10}O _5) _n$
$3$. sucrose, $C _{12}H _{22}O _{11}$.

  1. $1, 2$ and $3$ are correct
  2. $1$ and $2$ only are correct
  3. $2$ and $3$ only are correct
  4. $1$ only is correct
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
$\text{percentage mass of C}=\dfrac{\text{mass of C X 100%}}{\text{total mass}}$

$\text{1. percentage of C in glucose=40%}$
$\text{2. percentage of C in starch=44%}$
$\text{3. percentage of C in sucrose=42%}$
Multiple choice zoology skeleton and movements features of a muscle muscle features muscle contraction and its effects

During strenuous exercise, glucose is converted into

  1. Glycogen

  2. Pyruvic acid

  3. Starch

  4. Lactic acid
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Generally, the glucose undergoes metabolism in the presence of oxygen to form ATP(adenosine triphosphate) which is essential for the muscle contraction but during strenuous exercise, the body cannot meet the oxygen demand and the glucose undergoes metabolism in the absence of oxygen which results in the formation and accumulation of lactic acid.Hence during strenuous exercise,glucose is converted into lactic acid.

So,the correct answer is 'Lactic acid'.

Multiple choice chemistry electrolysis electrolytes and non-electrolytes introduction to electrolysis chemical reactions

Organic compounds which are non-electrolytes is :

  1. glucose

  2. urea

  3. alcohol

  4. all of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Nonelectrolytes are compounds that do not ionize at all in solution. As a result, solutions containing nonelectrolytes will not conduct electricity. Typically, nonelectrolytes are primarily held together by covalent rather than ionic bonds. 

Common examples of nonelectrolytes are glucose, urea and alcohol.

Multiple choice chemistry electrolysis electrolytes and non-electrolytes introduction to electrolysis chemical reactions

A sugar solution with sugar molecules and water molecules is:

  1. weak electrolyte

  2. non electrolyte

  3. metallic conductor

  4. strong electrolyte
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Sugar molecules are covalent compounds which doesn't dissociates into ions so they will not conduct electricity in solution and are non-electrolyte.
Also, water has very low ionisation constant so it dissociates very low and pure water is consists almost entirely of molecules. As number of ions are very less in pure water so normally it will not conduct electricity and its non-electrolyte.

Multiple choice biology food and human health balanced diet and malnutrition balanced and unbalanced food digestive disorders diseases caused by changes in lifestyle diseases and toxic substance health and its maintenance

Which one does not take part in breakdown of starch

  1. Invertase

  2. Lipase

  3. Amylase

  4. Diastase
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Amylase, Diastase, and Invertase are enzymes involved in the breakdown of carbohydrates (starch or sugars). Lipase is an enzyme specifically responsible for the breakdown of fats (lipids).

Multiple choice biology plant taxonomy classification of kingdom plantae features of plant and animal kingdom plant classification

 Plants use polymers of glucose as storage molecules and as structural components in their cell walls. Which of the following polysaccharides would be found in a plant?
 I. Starch
 II. Glycogen
 III. Cellulose

  1. I only

  2. II only

  3. III only

  4. I and II only

  5. I and III only
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

Cellulose forms an integral part of the cell wall which provides strength and rigidity to the cell. It helps to maintain the structural integrity of a particular cell. Cellulose is a complex polysaccharide which is made up of  β(1→4) linked D-glucose units.

Starch is the important food reserve for the plants. The excess amount of glucose synthesized during dark reaction of photosynthesis is stored in food vacuoles of the plant which it again converted into a usable form of glucose in case of unfavorable conditions. It is a complex polysaccharide formed by 1,4-alpha linkage between two glucose unit.
So, the correct answer is option E.

Multiple choice evs skeleton and muscular systems human muscular system closer look into muscular system muscles and its types

Blood glucose level is not dependent upon muscle glycogen, because of the absence of 

  1. Phosphorylase

  2. Branching enzyme

  3. Glucose-6-phosphatase

  4. Aldolase
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Stores of readily available glucose to supply the tissues with an oxidizable energy source are found principally in the liver, as glycogen. 

Glycogen is a polymer of glucose residues, linked by (1,4)- and -(1,6)-glycosidic bonds. A second major source of stored glucose is the glycogen of skeletal muscle. 
However, muscle glycogen is not generally available to other tissues, because muscle lacks the enzyme glucose-6-phosphatase. 
Glucose-6-phosphatase enzyme catalyses the conversion of glucose-6-phosphate to glucose. So, Blood glucose level is not dependent upon muscle glycogen.

Multiple choice biology structural organization in living organisms structure of a plant cell levels of organisation in plants plant and animal cell

Which of the following is the characteristic of plants ________________.

  1. Glucose and cellulose

  2. Pyruvic acid and glucose

  3. Cellulose and starch

  4. Starch and pyruvic acid
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Cellulose is a structural polysaccharide found in the cell walls of plants.

Plant cell wall is required not only for the structure to determine the actual shape of cells and functional properties to control inner and outer cellular communication but also for overall growth and tree expansion. Cellulose is the most significant component of plant cell walls. 
Starch is an energy storage polysaccharide found in plants.Plants need energy to grow.They use energy from sunlight to make a simple sugar, glucose.Plants make polymers - starch - out of extra glucose,so it's right there when they need it.

Multiple choice chemistry mix and separate different types of solutions various mixtures introduction to solutions

Sugar is soluble in water due to:

  1. high solvation energy.

  2. ionic character of sugar.

  3. high dipole moment of water.

  4. hydrogen bond formation with water.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

 The bond between the oxygen and hydrogen atoms ($O–H$ bond) in sugar (sucrose) gives the oxygen a slight negative charge and the hydrogen a slight positive charge.Sucrose is a polar molecule.

Multiple choice chemistry chemistry in daily life food spoilage and food preservation methods of preserving food chemicals in food

The sweeteners value of aspartame in comparison to cane sugar is:

  1. 550

  2. 100

  3. 600

  4. 2000
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
  • Sugar substitutes are substances that are used in place of sweeteners with sugar (sucrose) or sugar alcohols. They may also be called artificial sweeteners.
  • Natural sweeteners add to calorie intake and therefore many people prefer to use artificial sweeteners.
  • Aspartame is the most successful and widely used artificial sweetener. It is roughly 100 times as sweet as cane sugar. It is methyl ester of dipeptide formed from aspartic acid and phenylalanine. Use of aspartame is limited to cold foods and soft drinks because it is unstable at cooking temperature.