Biology Questions

Q:

All enzymes are proteins.

A) TRUE B) FALSE
Answer & Explanation Answer: A) TRUE

Explanation:

All enzymes are proteins but all proteins are not enzymes since, enzymes are subset of proteins.

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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:

The C shape of the tracheal cartilages is important because

A) divide the nasal cavity B) Allows for expansion or contraction of the trachea
C) provide a surface for the sense of smell D) All of the above
 
Answer & Explanation Answer: B) Allows for expansion or contraction of the trachea

Explanation:

Allows for expansion or contraction of the trachea. Hence, so large masses of food can pass through the esophagus during swallowing.

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Q:

In photosynthesis________

A) Light energy is converted into chemical energy B) Chemical energy is converted into Light energy
C) Chemical energy is converted into electrical energy D) Light energy is converted into Mechanical energy
 
Answer & Explanation Answer: A) Light energy is converted into chemical energy

Explanation:
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Q:

Plants grow in size because of 

A) addition of cells B) increase in size of cells
C) enlargement of cells D) elongation of cells
 
Answer & Explanation Answer: A) addition of cells

Explanation:

Plants grow in size both in height and in grith. Enlargement  of cells already present cannot contribute much to the growth. Only addition of more and more cells could increase the size of the plant considerably.

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Q:

Dysfunctional behaviors are maladaptive which means that they

A) are medicated B) interfere with everyday life
C) cause of stress D) all of the above
 
Answer & Explanation Answer: B) interfere with everyday life

Explanation:

Dysfunctional behaviors are maladaptive which means that they interfere with everyday life.

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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:

What happens at the synapse between two neurons?

A) electrical signals are converted into chemical B) chemical signals are converted into physical
C) physical signals are converted into chemical D) None of the above
 
Answer & Explanation Answer: A) electrical signals are converted into chemical

Explanation:

At the synapse between two neurons, electrical signals are converted into chemical signals. A synapse is the gap between the two neurons.

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