Biology Questions

Q:

Which nutrient has forms most of our body weight?

A) Water B) Fats
C) Carbohydrates D) Proteins
 
Answer & Explanation Answer: A) Water

Explanation:

Water is the important nutrient all organisms need. Humans has almost 60% of their body weight is water. Some organisms have 90% of their body weight is of water.

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Q:

All of the following are true of neurons except that

A) they conduct a nervous impulse B) they are a very specialized form of connective tissue
C) thay are separated from one another by synapses D) When mature, they lose ability to divide
 
Answer & Explanation Answer: B) they are a very specialized form of connective tissue

Explanation:

All of the following are true of neurons except that they are a very specialized form of connective tissue.

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Q:

What happens during the process of translation?

A) Transfer RNA is made from messenger RNA B) Copies of DNA molecules are made
C) The cell uses information from messenger RNA to produce proteins D) Messenger RNA is made from DNA
 
Answer & Explanation Answer: C) The cell uses information from messenger RNA to produce proteins

Explanation:

Translation is the process by which a protein is synthesized from the information contained in a molecule of messenger RNA (mRNA). During translation, an mRNA sequence is read using the genetic code, which is a set of rules that defines how an mRNA sequence is to be translated into the 20-letter code of amino acids, which are the building blocks of proteins.

 

In short, during the process of translation source language text is conveyed to destination language.

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Q:

Nitrogenous Food is

A) Proteins B) Carbohydrates
C) Salts D) Lipids
 
Answer & Explanation Answer: A) Proteins

Explanation:

Here the Nitrogenous Food is Proteins.

Nitrogenous Food ::

The animal body is more than a machine. It requires fuel to enable it not only to work but also to live, even without working. A part of the food eaten must go to maintain the body

Nitrogenous food compounds are sometimes classed together under the name of proteins. These may be divided into proteids, gelatinoids, and extractives.

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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 stimulated by decreased plasma sodium levels and increased plasma potassium levels.
C) Aldosterone is produced in the adrenal cortex. D) Aldosterone increases the number of passive sodium channels in the luminal membrane of the distal tubule and collecting duct, thus aiding sodium reabsorption.
 
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, the main mineralocorticoid hormone, is a steroid hormone produced by the zona glomerulosa of the adrenal cortex in the adrenal gland. It is essential for sodium conservation in the kidney, salivary glands, sweat glands and colon.

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Q:

The energy stored in photosynthesis is obtained from

A) Sunlight B) Oxidation of glucose
C) Breakdown of proteins D) breakdown of glucose
 
Answer & Explanation Answer: A) Sunlight

Explanation:
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Q:

Plants are green because they

A) Refract green light B) Absorbs green light
C) Reflects green light D) Do not absorb ultra violet light
 
Answer & Explanation Answer: C) Reflects green light

Explanation:
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Q:

Impulse conduction is fastest in neurons that are

A) Myelinated B) Motor
C) Unmyelinated D) Sensory
 
Answer & Explanation Answer: A) Myelinated

Explanation:

A myelinated nerve can be found int the brain or spinal cord as well as the peripheral nervous system, it is white and is surrounded by schwann cells or oligodendrocytes.

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