Biology Questions

Q:

When insulin is released, it causes

A) Amount of glucose in blood decreases B) Amount of glucose in blood increases
C) Amount of bile juice increases D) Amount of bile juice decreases
 
Answer & Explanation Answer: A) Amount of glucose in blood decreases

Explanation:

We know that, when we eat a meal, any carbohydrates we've eaten are broken down into glucose and passed into the bloodstream. This rise in blood glucose causes insulin to be released from the pancreas so glucose can move inside the cells and be used. As glucose moves inside the cells, the amount of glucose in the bloodstream returns to normal and insulin release slows down.

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Q:

Which of the following leads to the production of urea?

A) Synthesis of protein from amino acids B) Oxidation of glucose
C) Degradation of amino acids D) Incomplete oxidation of fatty acids
 
Answer & Explanation Answer: C) Degradation of amino acids

Explanation:

Urea is a by product of amino acid catabolism, Which occurs in the liver. The nitrogen in the  amino acid becomes converted to ammonia and this is further converted by the liver into urea

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Q:

Which of the following is present in a prokaryotic cell?

A) Ribosomes B) Chloroplast
C) Mitochondria D) None
 
Answer & Explanation Answer: A) Ribosomes

Explanation:

Ribosomes are present in prokaryotic cells. These are organelles which consist of two subunits. They are present in both Eukaryotic and Prokaryotic cells. They are made up of RNA and proteins and present in the cytoplasm and on the membranes and are involved in protein synthesis.

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Q:

The two purines in DNA are

A) Adenine & Thymine B) Thymine & Uracil
C) Guanine & Uracil D) Adenine & Guanine
 
Answer & Explanation Answer: D) Adenine & Guanine

Explanation:

The purines are bases in the DNA. The two purines in DNA are Adenine and Guanine. These two purines forms hydrogen bonds with their complimentary pyrimidines such as Thymine and Cytosine to keep the two rails of the DNA molecule together.

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Q:

During the process of protein synthesis, each trna carries one

A) amino acid B) nucleotide
C) fatty acid D) nucleic acis
 
Answer & Explanation Answer: A) amino acid

Explanation:

During protein synthesis process, each tRNA carries one aminoacid for protein synthesis to the ribosomes.

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Q:

The thyroid hormone that regulates carbohydrate metabolism is

A) Parathyroid B) Thyroxin
C) Parathormone D) Estrogen
 
Answer & Explanation Answer: B) Thyroxin

Explanation:

Thyroxin or Thyroxine is the thyroid hormone that regulates carbohydrate metabolism in the human body.

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Q:

Menstruation is triggered by a drop in the levels of

A) progesterone B) relaxin
C) FSH D) LH
 
Answer & Explanation Answer: A) progesterone

Explanation:

The principal hormone secreted by the corpus luteum is progesterone. Menstruation is triggered by a drop in the levels of progesterone.

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Q:

Bleeding of gums, falling of teeth, fragile bones and delayed wound healing occur due to the deficiency of which one of the following vitamins?

A) Vitamin C B) Vitamin K
C) Vitamin D D) Vitamin B
 
Answer & Explanation Answer: A) Vitamin C

Explanation:

Deficiency of Vitamin C causes Scurvy, Swelling of gums etc.Vitamin K causes Non-clotting of blood ,Vitamin D causes Rickets in children and Osteomalasia in adults, Vitamin B 1 causes Beriberi,B2 causes Cracking of skin,reddish eye,cracking of tongue,B3 causes Whitening of hair ,mentally retardness ,B5 causes Pallagra or 4D syndrome,B6 causes Anemia,skin disease ,B7 causes Paralysis,hair falling,B11 causes Dysentery and B12 causes Jaundice and Teroile Glutemi

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