Biology · Chemistry

Carbohydrates and Biomolecules

986 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 biomacromolecules biotechnology cell biology and biotechnology biomolecules biology

Which of these is not a macromolecule?

  1. Cellulose

  2. DNA

  3. Glycogen

  4. None of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Macromolecules are the molecules made by the attachment of micro molecule. These are complex molecules. Cellulose, DNA, and glycogen are macromolecules as they are formed by linkage of simple monomers.

Cellulose is a polysaccharide. It is formed by the linkage of beta 1,4 linkage of a glucose unit. It is an important component of the cell wall of the plant.
DNA and RNA are the chain of polynucleotide which are joined by the phosphodiester bonds.
Glycogen is a polymer of glucose. It's the structure similar to amylopectin where two polymeric chains of glucose of alpha 1,4 glucose unit are linked by alpha 1,6 linkage.
So, the correct answer is option D.

Multiple choice biomacromolecules biotechnology cell biology and biotechnology biomolecules biology
Which of the following are isomers?

  1. 3PGA and 2PGA

  2. PGAL and DHAP

  3. Glucose and Fructose

  4. All of these
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Isomers are molecules that have the same molecular formula but have a different arrangement of the atoms in space. That excludes any different arrangements which are simply due to the molecule rotating as a whole or rotating about particular bonds. For example, in respiration, 3PGA and 2PGA, PGAL and DHAP, Glucose and Fructose. 

Thus, the correct answers is 'All of these.'

Multiple choice biology respiration and energy transfer respiratory quotient-basic respiration-plants respiratory quotient

R.Q. is less than one at the time of respiration of

  1. Starch

  2. Sugarcane

  3. Glucose

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

Respiratory quotient or R.Q is defined as the ratio of carbon dioxide evolved to oxygen taken in for respiratory break down of a substrate. The value of R.Q for oxidation of carbohydrates is unity and less than one for oxidation of fats and proteins. Thus if groundnut, which stores fats is used as respiratory substrate the value of R.Q will be less than one.

Multiple choice biology respiration and energy transfer respiratory quotient-basic respiration-plants respiratory quotient

RQ is less than one for

  1. Carbohydrate

  2. Organic acid

  3. Starch

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

R.Q. is the ratio of amount of CO$ _2$ produced to the amount of O$ _2$ consumed by the cell for respiration. R.Q. value of protein is 0.8 as the volume of carbon dioxide released is less than the amount of oxygen. Carbohydrates, organic acid and starch have R.Q. of 1 or greater than 1.

So, the correct answer is 'Protein'. 

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.