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 Biology Questions

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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.

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1 1925
Q:

All of the following are polysaccharides except

A) Chitin B) Lactose
C) Glycogen D) Cellulose
 
Answer & Explanation Answer: B) Lactose

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0 1922
Q:

The mammalian heart is myogenic and it is regulated by nerves. The heartbeat originates from

A) sinoatrial node B) QRS wave
C) T wave D) hepatic portal system
 
Answer & Explanation Answer: C) T wave

Explanation:

The mammalian heartis called myogenic (myo = muscle, genie = originating from). It means the heart beat or the activities of the heart are auto regulated which originates from a muscle called nodal tissue.In the human heart,heartbeat originates and contraction is initiated by a special modified heart muscle known as sinoatrial node. It is located in the right atrium; while the QRS waves are the depolarisation of the ventricles, which initiates the ventricular contraction.The T-wave represents the repolarisation,that is, the return of the ventricles from excited tonormal state.Hepatic portal system is the unique vascular connection that exists between the digestive tract and liver. This vein carries blood from intestine to the liver.

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3 1910
Q:

What base is found on RNA but not on DNA?

A) Uracil B) Thymine
C) Adenine D) None of the above
 
Answer & Explanation Answer: A) Uracil

Explanation:

Uracil is present in RNA and binds to adenine whereas thymine is present in DNA and binds to adenine.

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5 1906
Q:

Smallest cell in human body is

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

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3 1905
Q:

What is the first thing that alcohol effects?

A) Judgement B) Speech
C) Vision D) Balance
 
Answer & Explanation Answer: A) Judgement

Explanation:

Alcohol impairs your judgement. Judgement is in your brain stupid and it impairs your brain. 

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0 1904
Q:

The scientific name of human being is?

A) Homo Nigrum B) Melongena Sapiens
C) Homo Sapiens D) Tigris Solanum
 
Answer & Explanation Answer: B) Melongena Sapiens

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1 1902
Q:

Which of the following is true of annelids?

A) They have an open circulatory system B) They have a nerve net
C) They perform gas exchange across their skin D) They have pseudocoeloms
 
Answer & Explanation Answer: C) They perform gas exchange across their skin

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2 1901