Tag: biomolecules

Quizzes (11) Questions (140)

Questions Related to biomolecules

Multiple choice carbohydrates - definition and classification introduction to carbohydrates biomolecules chemistry

Which of the following is true regarding monosaccharides?

  1. Always have six carbon atoms

  2. Always have five carbon atoms

  3. Always have four carbon atoms

  4. May contain 3 to 7 carbon atoms
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Monosaccharides may contain 3 to 7 carbon atoms. They have chemical formula $(CH _2O) _{n}$, where conventionally $n=3$. Monosaccharides can be classified by the number of carbon atoms they contain: diose(2), triose(3), tetrose(4), pentose(5), hexose(6), heptose(7) and so on.

Multiple choice carbohydrates - definition and classification introduction to carbohydrates biomolecules chemistry

Which of the following is synthetic sweetener?

  1. Saccharin

  2. Aspartame

  3. Dulcin

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

Saccharin, aspartame, dulcin all are synthetic sweetener. They have a sugar-like taste but with less food energy.

Artificial sweeteners are used in one of two ways. They may be used directly in commercially processed foods, or they are mixed with one or more starch-based sweeteners before sale to consumers.


$\therefore$ Option D is the correct answer.

Multiple choice carbohydrates - definition and classification introduction to carbohydrates biomolecules chemistry

Which of the following is incorrect?

  1. Fructose is reducing sugar
  2. Cellulose has $\beta$-D Glucose units

  3. DNA has D-ribose

  4. Amylopectin is insoluble in water
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Fructose is reducing sugar.
 
Cellulose is a polysaccharide composed of a linear chain of  $\beta $ 1,4 linked d glucose unit.with a degree of polymerization ranged from several hundreds to over ten thousands.

Amylopectin is a highly branched polymer of glucose found in plants. It is one of the two components of starch, the other being amylose.

As the name suggest DNA is deoxyribonucleic acid hence it has deoxyribose sugar not ribose sugar.

Multiple choice carbohydrates - definition and classification introduction to carbohydrates biomolecules chemistry

Consider the given statements.
I. Dextrin and glycogen are polysaccharides
II. Lactose and glucose are disaccharides
III.Sucrose and maltose are disaccharides
IV. Raffinose is oligosaccharide
The incorrect statements is/are:

  1. only II

  2. I and II

  3. I, II and III

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

Option (A) is right. The incorrect statement is (II).
(II) Lactose is a disaccharide while glucose is an aldosic monosaccharide.

Multiple choice carbohydrates - definition and classification introduction to carbohydrates biomolecules chemistry

Consider the given statements:


I. Maltose is also known as malt sugar.
II. Sucrose is also known as cane sugar.
III. Lactose is also known as grape sugar.
IV. Starch is also known as amylum.

The correct statement(s) is/are:

  1. I, II and IV

  2. I, II and III

  3. II, III and IV

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

(I) Maltose is also known as malt sugar.


(II) Sucrose is also known as cane sugar.

(III) Lactose is also known as milk sugar.

(IV) Starch is also known as amylum.

Hence, option A is correct.

Multiple choice carbohydrates - definition and classification introduction to carbohydrates biomolecules chemistry

Consider the statements about mono, di and oligo saccharides:


I. These are crystalline solids.
II. These are soluble in cold water.
III. These are tasteless.

The incorrect statement(s) is/are:

  1. only III

  2. I, II and III

  3. I and II only

  4. I and III only
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Monosaccharides, disaccharides and oligo saccharides are crystalline solids, water soluble and sweet in taste. They are called sugar.
Thus only statement III is incorrect.

Multiple choice carbohydrates - definition and classification introduction to carbohydrates biomolecules chemistry

A carbohydrate which cannot be hydrolysed to simpler compounds is called:

  1. monosaccharide

  2. disaccharide

  3. polysaccharide

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

Monosaccharide cannot be hydrolyzed to simpler compounds as it is itself the simplest unit.
Disaccharides, polysaccharides and oligosaccharides can be hydrolyzed to monosaccharides.