Tag: biological molecules

Quizzes (9) Questions (101)

Questions Related to biological molecules

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

Which of the following is a disaccharide?

  1. Glucose

  2. Lactose

  3. Starch

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

Disaccharides are oligosaccharides which are formed by condensation of two monosaccharides. Lactose is a disaccharide. It is made up of two hexose molecules, glucose, and galactose. Lactose is also known as milk sugar because it is found in milk. It is a reducing sugar. Thus, the correct answer is B

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

Which of the following sugars cannot be hydrolysed further to yield simple sugars?

  1. Ribose

  2. Maltose

  3. Sucrose

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

Carbohydrates which cannot be hydrolyzed further into smaller components are called monosaccharides or simple sugar. Ribose is a sugar which cannot be hydrolyzed further as it is a smaller sugar with 5 carbon. Maltose, Sucrose, and Lactose are complex sugar which can be hydrolyzed into a smaller unit of sugars. Thus, the correct option is A.

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

Which one of the following is not an oligosaccharide?

  1. Insulin

  2. Maltose

  3. Sucrose

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

Insulin is a peptide hormone which helps to maintain the blood sugar level. it is secreted by the beta cells of pancreas.

Maltose is the a disaccharide which is formed by the linkage of alpha 1,4 glucose molecules. It is digested by enzyme maltase. It acts on the glycosidic bonds of the maltose and converts into simpler compounds.
Sucrose is formed by the glycosidic linkage between glucose and fructose. The bond is formed between the between C$ _1$on the glucosyl subunit and C$ _2$ on the fructosyl unit. 

Raffinose is a trisaccharide which is made up of galactose, glucose, and fructose. The enzyme α-galactosidase hydrolyses the raffinose to  D-galactose and sucrose.
So, the correct answer is option C.

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

Which of the following groups contains all polysaccharides?

  1. Glycogen, sucrose and maltose

  2. Sucrose, glucose and fructose

  3. Maltose, lactose and fructose

  4. Glycogen, cellulose and starch
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The complex carbohydrates which are formed by polymerization of a large number of monosaccharides(more than 9 ). They are also known as glycans. Sucrose, Lactose, and maltose are disaccharides. Glucose and fructose are monosaccharides. Glycogen, cellulose, and starch are polysaccharides. Thus, the correct answer is D.

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

Which is structural polysaccharide?

  1. Glycogen

  2. Chitin

  3. Keratin

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

Chitin is the most abundant organic substance. It is a complex carbohydrate which is found in fungal walls as a structural component. It is also called as fungal cellulose. It provides strength and elasticity. Thus, the correct answer is B.

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

Select the correct answer from the following statemets
1. Cutin is fatty acid polymer
2. Starch is glucose polymer
3. Sucrose is monosaccharide
4. Maltose is polymer of fructose.

  1. 1, 2, 3 are correct

  2. 1 and 2 are correct

  3. 2 and 4 are correct

  4. 1 and 3 are correct
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Cutin is a polymer of glycerol and certain types of fatty acids. It is an integral part of the cuticle of the leaf. 

Starch is formed by a-1,4 linkages between two glucose unit which is broken down during its digestion. It exist in two forms known as amylose and amylopectin. Amylose is a linear poly-D-glucose in which the monosaccharides are connected by alpha 1, 4 linkages. Amylopectin is has alpha 1, 4-glycosidic linkages with side chain branching of alpha 1,6 linkage.
Sucrose is a disaccharide formed by the glycosidic linkage between glucose and fructose. It can be broken into glucose and fructose by enzyme sucrase.
Maltose is a disaccharide formed by the glycosidic linkage between glucose monomers. It can be hydrolysed to glucose by enzyme maltase.
So, the correct answer is option B.

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

Inulin is a

  1. Lipid

  2. Carbohydrate

  3. Protein

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

Inulin is a storage polysaccharide in roots of Dahlia and related plants. It is also known as a fructan. It is not metabolized in the human body and is readily filtered through the kidney. Therefore, it is used in testing kidney function. Thus, the correct answer is B.

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

Macro molecule chitin is 

  1. Phosphorus containing polysaccharide

  2. Sulphur containing polysaccharide

  3. Simple polysaccharide

  4. Nitrogen containing polysaccharide
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Macro-molecule chitin is a complex nitrogen-containing polysaccharide containing amino sugars and chemically modified sugar for example -glucosamine, N-acetyl-galactosamine etc.

So, the correct answer is 'Nitrogen containing polysaccharide'

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.