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Q:

The chemical component that is invariably found in all viruses is

A) proteins B) lipids
C) DNA D) RNA
 
Answer & Explanation Answer: A) proteins

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Q:

Presence of large amounts of nutrients in waters also causes excessive growth of _________ algae.

A) Biomagnification B) Algal bloom
C) planktonic D) Eutrophication
 
Answer & Explanation Answer: C) planktonic

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Q:

How many facial bones are there?

A) 34 B) 24
C) 14 D) 4
 
Answer & Explanation Answer: C) 14

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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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4 1411
Q:

The specificity of an antibody is due to

A) the variable portions of the H and L chains B) the L chains
C) its valence D) the H chains
 
Answer & Explanation Answer: A) the variable portions of the H and L chains

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Q:

Which of the following classes of animals has/have three-chambered heart?

A) Pisces and Amphibia B) Amphibia and Reptilia
C) Reptilia only D) Amphibia only
 
Answer & Explanation Answer: B) Amphibia and Reptilia

Explanation:

Mammalian and avian hearts have four chambers two atria and two ventricles.Amphibians and reptiles, by contrast, have a three-chambered heart. The three-chambered heart consists of two atria and one ventricle.Fish possess the simplest type of true heart a two-chambered organ composed of one atrium and one ventricle.

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Q:

The male sex organs in a flower is the __________.

A) Zoospores B) stamen
C) pistil D) Chlorophyceae
 
Answer & Explanation Answer: B) stamen

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Q:

Pepsin is an enzyme that digests ______.

A) proteins B) starch
C) carbohydrate D) fats
 
Answer & Explanation Answer: A) proteins

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