Biology Questions

Q:

Which two functional groups are always found in amino acids?

A) Carbonyl and amine B) Ketone and amine
C) Amine and carboxyl D) Aldehyde and amine
 
Answer & Explanation Answer: C) Amine and carboxyl

Explanation:

The two functional groups Amine and carboxyl groups are always found in amino acids.

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Q:

Which word best describes the structure of the cell membrane?

A) Rigid B) Impermeable
C) Nonpolar D) Layered
 
Answer & Explanation Answer: D) Layered

Explanation:
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Q:

Monosaccharide which is responsible for the sweet taste of fruit?

A) Glucose B) Fructose
C) Mannose D) Ribose
 
Answer & Explanation Answer: B) Fructose

Explanation:

Fructose or Levulose is the monosaccharide that is responsible for the sweet taste of fruit. 

 

Monosaccharides are the simplest of all sugars, contain at least three carbon atoms, and are the building blocks of all carbohydrates.

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Q:

The hormone that stimulates heart beat is

A) Thyroxine B) Gastrin
C) Glycogen D) Dopamine
 
Answer & Explanation Answer: A) Thyroxine

Explanation:
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Q:

The smallest blood vessels which are one-cell thick, are called ______.

A) vena cava B) arteries
C) veins D) capillaries
 
Answer & Explanation Answer: D) capillaries

Explanation:
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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:

Localized area of pus formation in the lungs?

A) Pleural effusion B) Pulmonary abscess
C) Pleurisy D) Pulmonary edema
 
Answer & Explanation Answer: B) Pulmonary abscess

Explanation:

Localized area of pus formation in the lungs is called Pulmonary abscess.

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Q:

Which of the following statements about DNA replication is true?

A) Single‑strand binding proteins stabilize the open conformation of the unwound DNA. B) Okazaki fragments are DNA fragments synthesized on the leading strand.
C) DNA polymerase adds dNTP monomers in the 3′-5′ direction. D) DNA gyrase unwinds the DNA double helix.
 
Answer & Explanation Answer: A) Single‑strand binding proteins stabilize the open conformation of the unwound DNA.

Explanation:
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