Tag: biomolecules

Quizzes (11) Questions (140)

Questions Related to biomolecules

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

The light coming from the sun is stored as energy in plants by the process of photosynthesis. This happens by converting carbon dioxide and water into:

  1. green leaves

  2. carbohydrates

  3. fats

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

Photosynthesis is the process by which plants utilize the energy from the sunlight in order to convert carbon dioxide and water into carbohydrates.

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

Formula of glucose is :

  1. $C _{5}H _{12}O _{6}$
  2. $C _{6}H _{12}O _{16}$
  3. $C _{6}H _{12}O _{7}$
  4. $C _{6}H _{12}O _{6}$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Formula of glucose is $C _6H _{12}O _6$ it is derived from the reaction of photosynthesis that is :


$6CO _2 + 6H _2O \overset{Sunlight}\longrightarrow C _6H _{12}O _6 + 6O _2$

Hence, the correct option is D.

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

Which of the following compounds will not undergo decomposition on passing electricity through aqueous solution?

  1. Sugar

  2. Sodium chloride

  3. Sodium bromide

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

Sodium chloride, sodium bromide, and sodium acetate are all ionic compounds and hence, they dissociate into their respective ions in an aqueous solution. On the contrary, sugar is a covalent compound and hence does not dissociate into ions

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

The two functional groups present in a typical carbohydrate are :

  1. $-CHO$ and $-COOH$
  2. $-CO$ and $-OH$
  3. $-OH$ and $-CHO$
  4. $-OH$ and $-COOH$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Carbohydrates are polyhydroxy aldehydes or polyhydroxy ketones OR compounds which give aldehydic as well as ketonic groups on hydrolysis. Therefore the major functional groups are (carbonyl) Aldehyde, Ketone, and hydroxy groups. 

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

Out of $1$M glucose and $2$M glucose. 2M glucose has  a higher boiling point.

  1. True

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

2 M glucose has a higher boiling point than 1 M of glucose.

Since on increasing the no of moles the molality also increases which is directly proportional to an elevation in boiling point.
Thus, the boiling point of the 2M of glucose will be greater than 1M glucose.

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

Which among the following is not the example of carbohydrate ?

  1. Glucose

  2. fractose

  3. Maltose

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

$\rightarrow$ Carbohydrates are important source of instant energy in our body system.
$\rightarrow$ Honey has been used as instant source of enrgy in ayurvedic medicines.
$\rightarrow$ Carbohydrates are used as storage starch in plants and glycogen
$\rightarrow$ carbohydrates are also used in textile industry.

So, the correct answer is NYLON (It is a synthetic polymer)

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

For 'invert sugar', the correct statement(s) is (are)
(Given : specific rotations of (+) -sucrose, (+) -maltose, L-(-)-glucose and L-(+)-fructose in aqueous solution are $+66^0, +140^0, -52^0$ and $92^0$, respectively)

  1. 'invert sugar' is prepared by acid catalyzed hydrolysis of maltose

  2. 'invert sugar' is an eqimolar mixture of D-(+)-glucose and D-(-)-fructose
  3. specific rotation of 'invert sugar' is $-20^0$
  4. on reaction with $Br _2$ water, 'invert sugar' forms saccharic acid as one of the products
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Invert sugar is a sucrose, partially or totally cleaved into fructose and glucose. Sucrose is converted into  invert sugar by chemical reaction called hydrolysis by heating a mixture or solution of table sugar.

Also, breakdown of sucrose may happen in a reaction catalyzed by enzymes such as sucrose, invertase etc or by acid catalyzed hydrolysis of maltose.