Biology Questions

Q:

What contributes to antigenic shift in influenza viruses?

A) a segmented genome B) different virus subtypes
C) Both A & B D) ease of virus transmission
 
Answer & Explanation Answer: A) a segmented genome

Explanation:
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Q:

Which RNA base pairs with the adenine in DNA?

A) Thymine B) Cytosine
C) Both A & B D) Uracil
 
Answer & Explanation Answer: D) Uracil

Explanation:

In DNA, adenine pairs with Thymine. Similarly, in RNA, due to absence of thymine in RNA and the same structure with uracil helps to pair with adenine.

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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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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:

A molecule of dna is a polymer composed of

A) Amines B) Nuceotides
C) Chromosomes D) Fattyacids
 
Answer & Explanation Answer: B) Nuceotides

Explanation:

A molecule of DNA is a polymer composed of nucleotides. Each nucleotide is composed of a nitrogenous base, a five-carbon sugar (deoxyribose), and a phosphate group.

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Q:

Androgens such as testosterone are produced by the

A) Spermatoganea B) Interstitial cells
C) Seminiferous D) None of the above
 
Answer & Explanation Answer: B) Interstitial cells

Explanation:

Androgens such as testosterone are produced by the Interstitial cells.

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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:

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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