Tag: biology

Questions Related to biology

Following are the examples of primary metabolites, except

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

  1. Lecithin

  2. Cholestrol

  3. Triglyceride

  4. Cellulose

Show answer
Correct Option: A
Explanation:

A primary metabolite is a type of metabolite, which is directly involved in the normal growth, development, reproduction of an organism. e.g. Cellulose, cholesterol, triglycerides. Secondary metabolites which are not directly involved in the growth, development.  Secondary metabolite performs another function like defence. e.g. lecithin present in WBC which help in the recognition of foreign pathogen.

So, the correct answer is 'Lecithin'

Chitin is the example of _________.

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

  1. Monosaccharide

  2. Disaccharide

  3. Polysaccharide

  4. All

Show answer
Correct Option: C

Which of the following statements is not correct regarding chitin?

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

  1. It is a storage polysaccharide

  2. It is a homopolysaccharide

  3. It is constituent of arthropod exoskeleton and fungal cell wall

  4. It contain $\beta 1-4$ glycosidic bond

Show answer
Correct Option: A
Explanation:

Chhtitn is the main ingredient in the exoskeletons of arthropods and crustaceans and is also in the cell walls of fungi. That means everything from beetles, spiders, and butterflies to lobsters, crabs, and shrimps have some chitin in their protective armors.

So, the correct option is 'It is storage polysaccharide'.

The primary function of carbohydrates in cells are

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

  1. Signal transduction

  2. Storage of information and catalysis of substances

  3. Energy storage and cell identity

  4. Catalysis and transport of various substances

Show answer
Correct Option: C
Explanation:

Primary functions of carbohydrates in the cells are as follows as:

  • Provide energy to all cells of the body of an organism.
  • Store energy in the form carbohydrates.
  • Also, help in building the macromolecule, proteins and fats.
  • Also, help in the formation of receptor ( e.g. lecithin) present on the cell surface and help in cell identity.
  • So, the correct answer is 'Energy storage and cell identity'.

How much energy is utilised in the synthesis of one gram mole of glucose?

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

  1. $673$ kcal

  2. $686$ kcal

  3. $666$ kcal

  4. $696$ kcal.

Show answer
Correct Option: B
Explanation:

$686$ kcal energy is utilised in the synthesis of one gram mole of glucose. 

When $1$ mol of glucose means $180$ g of glucose reacts with oxygen under standard conditions, so $686$ kcal is released in the reaction.
Hence, the correct option is B.

Which of these is not an aldose sugar?

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

  1. Glucose

  2. Mannose

  3. Fructose

  4. Ribose

Show answer
Correct Option: C
Explanation:
Aldose and ketose are two different types of sugars, which are named on the basis of presence of functional group, aldehyde or ketone. The sugars which contain aldehyde(-CHO) as a functional group are named as aldoses, while sugars which contain Ketone(-CO-) as a functional group are called as ketoses. In the given question glucose, ribose, and mannose, contains aldehyde as a function group and therefore are examples of aldoses. However, fructose contains a Ketone group and therefore it is a ketose and not aldose.
So, the correct answer is 'Fructose'.

Raw banana has bitter taste, while ripe banana has sweet taste. It happens because of the conversion of

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

  1. Starch to sugar

  2. Sucrose to fructose

  3. Amino acids to sugar

  4. Amino acids to protein

Show answer
Correct Option: A
Explanation:

Raw banana has a bitter taste due to the presence of starch. When the banana ripens, the starch is converted to sugar in the form of glucose. The sugar is responsible for providing a sweet taste. So, the conversion is starch to sugar. 

Thus, the correct answer is 'starch to sugar'.

The relationship between glucose and sucrose is

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

  1. Glucose is sucrose, with an extra -OH group at the $3'$ position.

  2. Sucrose is compared of two glucose molecules joined by a glycoside bond.

  3. A glucose molecule, joined to a fructose molecule makes a molecule of sucrose.

  4. Glucose is compared of two sucrose molecules, joined by a glycoside bond.

  5. Glucose is compared of a fructose and a sucrose molecule, joined by a glycoside bond.

Show answer
Correct Option: C
Explanation:

Glucose and fructose are simple sugars known as monosaccharides. Sucrose is a disaccharide. Sucrose is made up of 2 simple sugars - glucose + fructose. 

Which of the following process is responsible for the release of carbon dioxide by the animals?

biology human system gas exchange and smoking gas exchange gas exchange in humans

  1. Respiration

  2. Digestion

  3. Photosynthesis

  4. Reproduction

Show answer
Correct Option: A
Explanation:

  • During cellular respiration, glucose and oxygen are changed into energy and carbon dioxide. 
  • Therefore, carbon dioxide is released into the atmosphere during the process of cellular respiration. Hence, respiration is responsible for the release of carbon dioxide by animals.
So, the correct answer is 'respiration'.

By observing the interdependence of plants and animals and circulation of oxygen and carbon dioxide we can say that

biology human system gas exchange and smoking gas exchange gas exchange in humans

  1. Some day all the oxygen will be used up by the animals.

  2. Some day all the carbon dioxide will be used up by the plants.

  3. The amount of oxygen is increasing and that of carbon dioxide is decreasing in our atmosphere.

  4. The level of oxygen and carbon dioxide in the atmosphere is kept constant.

Show answer
Correct Option: D
Explanation:

  • The free oxygen in the atmosphere comes from photosynthesis by green plants, chiefly the phytoplankton in the ocean.
  •  Animals and combustion of organic matter absorb the oxygen and release CO2.
  • This Carbon dioxide is absorbed by green plants which are exhaled by animals.
  •  It’s a dynamic equilibrium. Hence, By observing the interdependence of plants and animals and circulation of oxygen and carbon dioxide we can say that The level of oxygen and carbon dioxide in the atmosphere is kept constant.
So, the correct answer is 'The level of oxygen and carbon dioxide in the atmosphere is kept constant'.