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 Biology Questions

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Q:

What is scientific name of "Cotton"  ?

A) Azadhirachta Indica B) Phaseolies auicus
C) Gossypium Herbaceum D) Ficus Benghalensis
 
Answer & Explanation Answer: C) Gossypium Herbaceum

Explanation:
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Q:

Which of the following statements about ddntps is true?

A) They have a hydrogen at the 3’ carbon of the sugar. B) DNA polymerase can add a new dNTP to a 3’ ddNTP.
C) They have a free 3’-hydroxyl group on the ribose sugar. D) They have an oxygen at the 2’ carbon of the ribose sugar.
 
Answer & Explanation Answer: A) They have a hydrogen at the 3’ carbon of the sugar.

Explanation:

ddNTPs - Dideoxynucleotides and abbreviated as ddNTPs.

 

They are chain-elongating inhibitors of DNA polymerase, used in the Sanger method for DNA sequencing.

 

They have a hydrogen at the 3’ carbon of the ribose sugar.

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Q:

The universal donor belongs to blood group

A) A B) B
C) AB D) O
 
Answer & Explanation Answer: D) O

Explanation:

The persons with 'O' blood group do not have antigens in the red corpuscles. So that blood will not cause agglutination of corpuscles if mixed with any type of blood. So group 'O' persons are called universal donors.

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Q:

A colour blind person has difficulty in distinguishing which of the two colours ?

A) Green & Red B) White & Red
C) Blue & Red D) Red & Black
 
Answer & Explanation Answer: A) Green & Red

Explanation:
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Q:

A tetrad is made up of

A) four homologous pairs of chromosomes B) two homologous chromosomes, each consisting of two chromatids
C) four non-homologous chromosomes D) two homologous pairs of chromosomes
 
Answer & Explanation Answer: B) two homologous chromosomes, each consisting of two chromatids

Explanation:

A tetrad is formed from two homologous chromosomes, each consisting of two chromatids in the first stage of meiosis called prophase1.

 

A_tetrad_is_made_up_of1562827273.jpg image

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Q:

Organisms need Nutrients in order to

A) Breaking down food B) Utilize chemical compounds
C) recycling D) None
 
Answer & Explanation Answer: A) Breaking down food

Explanation:

Nutrients are necessary for break down the food and supply energy to the organisms and to carry out essential life functions.

  • Important nutrients are Hydrogen, Carbon and Oxygen.

 

  • Some more important nutrients for plants are : Potassium, Sulphur, Nitrogen, Phosphorous, Calcium and Magnesium. 
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Q:

The enzyme that is necessary to bring about clotting of blood is 

A) peptidase B) amylase
C) lipase D) thrombokinase
 
Answer & Explanation Answer: D) thrombokinase

Explanation:

The clotting of blood is a chain reaction initiated by the enzyme thrombokinase produced by the platelets. This causes prothrombin to be converted into thrombin in the presence of Ca++ion.

Thrombin combines with fibrinogen  to produce fibrin threads which entangles the corpuscles to form the clot.

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Q:

A vehicle born transmitted diseases are

A) Plague and Malaria B) Chicken Pox and Tetanus
C) Mumps and Common cold D) Eye infection and influenza
 
Answer & Explanation Answer: A) Plague and Malaria

Explanation:
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