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Q:

Which helps prevent errors in DNA replication?

A) Complementary base pairing reduce errors B) DNA ligase checks the DNA for errors
C) DNA is located in the ribosomes D) Any base can pair with any other base

Answer:   A) Complementary base pairing reduce errors



Explanation:

DNA replication is the biological process of producing two identical replicas of DNA from one original DNA molecule. DNA replication occurs in all living organisms acting as the basis for biological inheritance. Complementary base pairing helps prevent errors in DNA replication.

Subject: Biology
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Q:

Which of the following is a metabolic function of skin?

A) synthesis of a vitamin D precursor B) cutaneous sensation
C) body temperature regulation D) elimination of nitrogenous wastes
 
Answer & Explanation Answer: A) synthesis of a vitamin D precursor

Explanation:
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Q:

By which process substance like carbon dioxide or oxygen can move across the cell membrane?

A) Plasmolysis B) Sedimentation
C) Diffusion D) Transpiration
 
Answer & Explanation Answer: C) Diffusion

Explanation:
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Q:

Which of the following is NOT included in the excretory system of human being?

A) A pair of kidney B) A pair of ureters
C) Abdomen D) Urinary bladder
 
Answer & Explanation Answer: C) Abdomen

Explanation:
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Q:

Which of the following enzymes is responsible for RNA synthesis?

A) RNA polymerase B) RNase
C) RNA ligase D) DNA polymerase
 
Answer & Explanation Answer: A) RNA polymerase

Explanation:

The enzyme that is mainly responsible for RNA synthesis is known as RNA polymerase.

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Q:

The formed elements in the blood are

A) Erythrocytes B) Leucocytes
C) Thrombocytes D) All the above
 
Answer & Explanation Answer: D) All the above

Explanation:

The formed elements are so named because they are enclosed in a plasma membrane and have a definite structure and shape.

 

The formed elements in the blood are Erythrocytes (RBC's), Leukocytes (WBC's) and Thrombocytes (Platelets).

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Q:

What is the shape of the two guard cells which enclose stomata?

A) Oval B) Triangular
C) Rectangular D) Kidney shaped
 
Answer & Explanation Answer: D) Kidney shaped

Explanation:
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Q:

Match the following.

 

A) I – 2, II – 3, III – 1 B) I – 1, II – 3, III – 2
C) I – 3, II – 1, III – 2 D) I – 3, II – 2, III – 1
 
Answer & Explanation Answer: C) I – 3, II – 1, III – 2

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Q:

....... produces a usable form of energy for the cell.

A) Ribosomes B) Plastids
C) Mitochondria D) Chloroplast
 
Answer & Explanation Answer: C) Mitochondria

Explanation:

Mitochondria are organelles that generate most of the chemical energy needed to power the cell's biochemical reactions. Hence, thay are also called as Power house of the cell.

 

mitochondria1593761207.jpg image

 

* Chemical energy produced by the mitochondria is stored in a small molecule called adenosine triphosphate (ATP).

 

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