Biology Questions

Q:

Which of the following statements about aldosterone is NOT correct?

A) Aldosterone increases sodium reabsorption by increasing the number of Na+-K+ ATPase pumps in the luminal membrane of the proximal tubule. B) Aldosterone is produced in the adrenal cortex.
C) Aldosterone is stimulated by decreased plasma sodium levels and increased plasma potassium levels. D) All of the above
 
Answer & Explanation Answer: A) Aldosterone increases sodium reabsorption by increasing the number of Na+-K+ ATPase pumps in the luminal membrane of the proximal tubule.

Explanation:

Aldosterone is a steroid hormone that is produced in the adrenal gland. It is useful and more essential for the conservation of sodium content in the kidney, salivary glands, colon and sweat glands.

 

Here, Aldosterone increases sodium reabsorption by increasing the number of Na+-K+ ATPase pumps in the luminal membrane of the proximal tubule is the only option that is NOT correct about aldosterone.

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Q:

When the diaphragm and external intercostal muscles contract,

A) the volume of the thorax decreases. B) the volume of the lungs decreases.
C) the volume of the thorax increases. D) the lungs shrink.
 
Answer & Explanation Answer: C) the volume of the thorax increases.

Explanation:
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Q:

Visceral muscle is another name for

A) Cardiac muscle B) Smooth muscle
C) Skeletal muscle D) None of the above
 
Answer & Explanation Answer: B) Smooth muscle

Explanation:

Visceral muscle is another name for Smooth muscle.

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Q:

Which of the following cells produce antibodies?

A) Plasma cells B) Monocytes
C) Mast cells D) Neutrophils
 
Answer & Explanation Answer: A) Plasma cells

Explanation:
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Q:

Which is a homologous chromosome pair?

A) Tetrad B) Gamate
C) Chromatid D) Zygote
 
Answer & Explanation Answer: A) Tetrad

Explanation:

Tetrad is a homologous chromosome pair in the given options. A homologous chromosome pair is a pair of chromosomes one from father and one from mother that has same gene sequence after the process of meiosis.

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Q:

Variation in human skin color is an example of

A) Heredity B) Polygenic traits
C) Multiple alleles D) Incomplete dominance
 
Answer & Explanation Answer: B) Polygenic traits

Explanation:
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Q:

Activation of the receptors by stimuli is called

A) Adaptation B) Perception
C) Habituation D) Sensation
 
Answer & Explanation Answer: D) Sensation

Explanation:

Sensation is the activation of the receptors by stimuli.

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Q:

When does DNA replication happen?

A) S - phase B) M - Phase
C) Prophase D) Anaphase
 
Answer & Explanation Answer: A) S - phase

Explanation:

DNA is replicated during the S-Phase in the interphase of a cell.

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