1250+ Interesting Biology Questions Answers MCQ

Q:

Unlike eutherians, both monotremes and marsupials

A) have some embryonic development outside the uterus	B) are found in Australia
C) lay eggs	D) lack nipples

Answer & Explanation Answer: A) have some embryonic development outside the uterus

Explanation:

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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:

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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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 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:

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:

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 hormone that stimulates heart beat is

A) Thyroxine	B) Gastrin
C) Glycogen	D) Dopamine

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