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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:   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.

Subject: Biology
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Q:

Every ecosystem must have

A) Autotrophs B) Heterotrophs
C) Both A & B D) photosynthesizers
 
Answer & Explanation Answer: A) Autotrophs

Explanation:

Every ecosystem must have Autotrophs.

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Q:

The support cells of the nervous system are

A) astrocytes B) oligodendrocytes
C) ependymal cells D) All of the above
 
Answer & Explanation Answer: D) All of the above

Explanation:

The support cells of the nervous system are Glia, also called glial cells or neuroglia. In the central nervous system, there are four types of supporting cells. They are ::

The_support_cells_of_the_nervous_system_are1547786671.jpg image

 

* Astrocytes

* Microglial cells

* Ependymal cells

* Oligodendrocytes

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Q:

Which is the largest gland in the human body?

A) Pituitary B) Liver
C) Pineal D) Adrenal
 
Answer & Explanation Answer: B) Liver

Explanation:
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Q:

What is the average Life span of RBC?

A) 120 days B) 99 days
C) 101 days D) 111 days
 
Answer & Explanation Answer: A) 120 days

Explanation:

The average Life span of RBC is 120 days.

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Q:

Which describes the correct pairing of DNA bases?

A) guanine - cytosine B) adenine - cytosine
C) guanine - thymine D) thymine - cytosine
 
Answer & Explanation Answer: A) guanine - cytosine

Explanation:

The correct pairing of DNA bases among the given options is guanine - cytosine.

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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:

What is the function of chloroplast in a plant cell?

A) absorb nutrients from soil B) absorb water
C) absorb sunlight D) All of the above
 
Answer & Explanation Answer: C) absorb sunlight

Explanation:

Chloroplasts are organelles found in plant cells and eukaryotic algae that conduct photosynthesis. Chloroplasts absorb sunlight and use it in conjunction with water and carbon dioxide gas to produce food for the plant.

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Q:

Which statement correctly describes the role of chance in evolution?

A) An allele that increases evolutionary fitness cannot be lost from a population by chance events. B) The ultimate source of new alleles is mutation, random changes in the nucleotide sequences of an organism's DNA
C) Evolutionary change proceeds by an accumulation of changes that occur by chance. D) None of the above
 
Answer & Explanation Answer: B) The ultimate source of new alleles is mutation, random changes in the nucleotide sequences of an organism's DNA

Explanation:
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