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 biology food and it's constituents energy giving food carbohydrate and its test biological molecules

Carbohydrates, the most abundant biomolecules on earth, are produced by -

  1. Some bacteria, algae and green plant cells

  2. All bacteria, fungi and algae

  3. Fungi, algae and green plants cells

  4. Viruses, fungi and bacteria
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Green plants produce carbohydrates by the process of photosynthesis by using water, carbon die oxide and solar energy. Apart from this, some bacteria and algae can also produce carbohydrates in the form of food. 

So, option A is the correct answer. 

Multiple choice biology food and it's constituents energy giving food carbohydrate and its test biological molecules

Which carbohydrate is found in the exoskeleton, of insects and crabs?

  1. Starch

  2. Chitin

  3. Cellulose

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

Chitin is the substance which is fibrous and made up of the long-chain polymer of N-acetylglucosamine, is a derivative of glucose. It is a major constituent of the exoskeleton of arthropods, crabs and also make the cell wall of fungi.

Hence, the correct answer is 'Chitin'

Multiple choice biology food and it's constituents energy giving food carbohydrate and its test biological molecules

Which of the following is primary metabolite?

  1. Carotenoid

  2. Glucose

  3. Morphine

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

  • Primary metabolites are those that are formed during the growth phase and supports in the overall development of cells. E.g., Carbohydrates, vitamins, proteins etc.
  • Secondary metabolites are those which are the end products of primary metabolites and are required for ecological activities of cells. E.g., Carotenoids, morphine etc. 
So, the correct option is 'Glucose'.

Multiple choice biology food and it's constituents energy giving food carbohydrate and its test biological molecules

Which of the following have a glycosidic bond and hydrogen bond respectively?

  1. Polysaccharide and Water

  2. Fat and Polysaccharide

  3. Protein and fat

  4. Fat and Protein
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The glycosidic bond is a bond that holds a carbohydrate molecule with another group, which may or may not be a carbohydrate. Polysaccharides contain several monosaccharides that are linked to one another by glycosidic bonds. In water each water molecule binds four other water molecules by hydrogen bonds. This helps the water molecules to hold together (cohesion of water). 

So, the correct answer is ' Polysaccharide and Water'.

Multiple choice biology food and it's constituents energy giving food carbohydrate and its test biological molecules

What are carbohydrates?

  1. Aldehydic and ketonic derivatives.

  2. Polyhyrdroxy compounds.

  3. Optically active substances and hydrates of carbon.

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

Carbohydrates are polyhydroxy aldehydes and ketones. They have two functional groups alcohol and either aldehyde or ketone. Most common carbohydrates are compounds of carbon, hydrogen and oxygen where hydrogen and oxygen occur in the ration of 2:1 like water. Hence, carbohydrates are also called as hydrates of carbon. Carbohydrates have asymmetric carbon atoms, hence, carbohydrates are optically active and rotate the plane of polarised light .

Multiple choice biology food and it's constituents energy giving food carbohydrate and its test biological molecules

The molecule of biological kingdom most abundant on earth is ...................... with ....................... monomers.

  1. Cellulose, glucose

  2. Starch, glucose

  3. Glycogen, amylose

  4. Actin, amylopectin
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Cellulose is the most abundant organic polymer on earth. Cellulose is an important structural component of the primary cell wall of green plants. Glucose is one of the primary molecules, which serve as energy sources for plants and animals. It is the most important simple sugar in human metabolism. Cellulose can be broken down chemically into its glucose units by treating it with concentrated acids at high temperature.

Multiple choice biology food and it's constituents energy giving food carbohydrate and its test biological molecules

Carbohydrates, the most abundant biomolecules on earth, are produced by

  1. All bacteria, fungi and algae.

  2. Fungi, algae and green plant cells.

  3. Some bacteria, algae and green plant cells.

  4. Viruses, fungi and bacteria.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
Carbohydrates are the most abundant bimolecules found on the surface of the earth. This is so because every year plants and alga through the process of photosynthesis converts more than 100 billion metric tones of carbondioxide and water to cellulose and other products for use by the plants. 

Multiple choice biology food and it's constituents energy giving food carbohydrate and its test biological molecules

Carbohydrates which cannot be further hydrolysed into simple form are

  1. Monosaccharides

  2. Disaccharides

  3. Oligosaccharides

  4. Polysaccharides
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Simple carbohydrates are generally soluble sugars. Simpler carbohydrates are of two types Monosaccharides and Oligosaccharides. Monosaccharides are monomer sugars which cannot be hydrolysed further into smaller units, e.g., trioses, tetroses, pentoses, hexoses and heptoses. Oligosaccharides are made up of a few units of monosaccharides.

Multiple choice biology food and it's constituents energy giving food carbohydrate and its test biological molecules

The cell wall of plants is made up of cellulose, which is

  1. A lipid

  2. A protein

  3. A polysaccharide

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

In the primary plant cell wall, the major carbohydrates are cellulose, hemicellulose and pectin. The cellulose microfibrils are linked via hemicellulosic tethers to form the cellulose-hemicellulose network, which is embedded in the pectin matrix. The most common hemicellulose in the primary cell wall is xyloglucan.

Multiple choice biology food and it's constituents energy giving food carbohydrate and its test biological molecules

The bonds present between two carbohydrates molecule is

  1. Glycosidic

  2. Hydrogen bond

  3. Phosphodiester

  4. Amide
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The bonds present between two carbohydrate molecules is glycosidic. A glycosidic bond is a type of covalent bond that joins a carbohydrate molecule to another group, which may or may not be another carbohydrate. A glycosidic bond is formed between the hemiacetal or hemiketal group of a saccharide and the hydroxyl group of some compound such as an alcohol. A substance containing a glycosidic bond is a glycoside.

Multiple choice biology food and it's constituents energy giving food carbohydrate and its test biological molecules

Which of the following is sweet in taste but is not a sugar?

  1. Starch

  2. Saccharine

  3. Lactose

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

Sweet tasting carbohydrates are called sugars, e.g., glucose and fructose. Starch is a storage polymer of glucose and is tasteless till it is broken down into monomer glucose molecule. Lactose is milk sugar. Proteins are polymers of amino acids which are tasteless except for some like aspartic acid. Saccharine is an artificial sweetener. Saccharin is more sweet than common table sugar or sucrose but has a bitter after taste.

Multiple choice biology food and it's constituents energy giving food carbohydrate and its test biological molecules

Carbohydrates, the most abundant biomolecules on Earth, are produced by

  1. Some bacteria, algae and green plant cells

  2. All bacteria, fungi and algae

  3. Fungi, algae and green plant cells

  4. Viruses, fungi and bacteria
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Carbohydrates are the most abundant bimolecules found on the face of the earth. This is so because every year plants and alga through the process of photosynthesis converts more than 100 billion metric tones of $CO _2$ and $H _2O$ to cellulose and other products for use by the plants.