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Q:

The antibiotic penicillin is obtained from which of the following ?

A) synthetic process B) a bacterium
C) fungus D) virus infected cells
 
Answer & Explanation Answer: C) fungus

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Q:

Honey that has high concentration of sugar does not decay because

A) Bacteria cannot survive in an active state as it is totally deprived of oxygen B) It contains natural antioxidant that prevents bacterial attack
C) Bacteria cannot survive in an active state in a solution of high osmotic strength as water is drawn out D) None of these
 
Answer & Explanation Answer: C) Bacteria cannot survive in an active state in a solution of high osmotic strength as water is drawn out

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Q:

In how many parts is the human brain divided?

A) 2 B) 3
C) 4 D) 5
 
Answer & Explanation Answer: B) 3

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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

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Q:

Synapse gap is present between which of the following?

A) Two neurons B) Brain and Spinal Cord
C) Two Kidneys D) None of these
 
Answer & Explanation Answer: A) Two neurons

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Q:

Steroid hormones exert their action by

A) entering the cell and activating mitichondrial DNA B) binding cell receptors
C) activating hypothalmic release of regulating hormones D) entering the nucleus of a cell and initiating or altering the expression of a gene
 
Answer & Explanation Answer: D) entering the nucleus of a cell and initiating or altering the expression of a gene

Explanation:

Steroid hormones exert their action by entering the nucleus of a cell and initiating or altering the expression of a gene.

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Q:

Blood flow to a tissue will increase if the

A) pH rises B) Level of carbon dioxide at the tissue increases
C) Vessels constrict D) Level of oxygen at the tissue increases
 
Answer & Explanation Answer: B) Level of carbon dioxide at the tissue increases

Explanation:

The movement of blood in the body is called blood flow. The blood flows through the vessels, tissues and organs. Blood flow to a tissue will increase if the level of carbon dioxide at the tissue increases.

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Q:

Which of the following vitamins are water soluble?

A) Vit. A & Vit. B B) Vit. B & Vit. C
C) Vit. C & Vit. D D) Vit. A & Vit. K
 
Answer & Explanation Answer: B) Vit. B & Vit. C

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