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 Biology Questions

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Q:

Select the correct statement about immune system?

A) The causative agent in acquired immune deficiency syndrome (AIDS) is a virus that recognizes CD4 proteins B) The most common form of immunodeficiency is graft­versus­host (GVH) disease
C) Severe combined immunodeficiency (SCID) disease is an acquired condition D) Hodgkin's disease is a hereditary immunodeficiency found in children
 
Answer & Explanation Answer: A) The causative agent in acquired immune deficiency syndrome (AIDS) is a virus that recognizes CD4 proteins

Explanation:

Among the given options, the correct statement about immunodeficiency is "The causative agent in acquired immune deficiency syndrome (AIDS) is a virus that recognizes CD4 proteins".

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Q:

Smallest cell in human body is

A) Ovum B) Nerve cell
C) Sperm D) None of the above
 
Answer & Explanation Answer: C) Sperm

Explanation:
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Q:

The temperature danger zone for food is

A) 5 - 63 deg B) above 45 deg
C) below 15 deg D) None of the above
 
Answer & Explanation Answer: A) 5 - 63 deg

Explanation:

The temperature danger zone for the food that cannot be stored for long time is between 5 degrees to 63 degrees centigrade.

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Q:

Lysergic acid diethylamide (LSD) is a drug used as a

A) Sedative B) Hallucinogen
C) Steroid D) Analgesic
 
Answer & Explanation Answer: B) Hallucinogen

Explanation:

Lysergic acid diethylamide (LSD) is a drug used as a Hallucinogen.

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Q:

The pale yellow colour of urine is due to the presence of which pigment?

A) Urochrome B) Urophyll
C) Chlorophyll D) Chloroplast
 
Answer & Explanation Answer: A) Urochrome

Explanation:
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Q:

The definition of Lysogeny is

Answer

The definition of Lysogeny is a dormant viral infection of bacteria in which the genetic material of a virus combines with that of a host bacterium.

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Q:

Which is a difference between proteins and carbohydrates and fats?

A) Proteins are composed of monomers; carbohydrates and fats are not. B) Excess carbohydrates and fats are stored; excess proteins are not.
C) Proteins are macromolecules; carbohydrates and fats are not. D) Carbohydrates and fats contain carbon, hydrogen, and oxygen; proteins do not.
 
Answer & Explanation Answer: B) Excess carbohydrates and fats are stored; excess proteins are not.

Explanation:

All proteins, carbohydrates and fats are macronutrients that we need to make living. They contribute to 90% of the dry weight of our diet. 

 

From the given options, Excess carbohydrates and fats are stored; excess proteins are not.

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Q:

Which molecule is always single stranded?

A) RNA B) DNA
C) Mitochondria D) Cellulose
 
Answer & Explanation Answer: A) RNA

Explanation:

RNA is a single-stranded molecule in many of its biological roles and consists of a much shorter chain of nucleotides.

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