Question Bank - General Science

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Which of the following statements is true?

A.
The amount of DNA in human brain cell increases as the size of the brain increases.
B.
All somatic human cells have the same amount of DNA in their nuclei.
C.
All human beings have the same amount of DNA in their bodies.
D.
All human cells have the same amount of DNA in their nuclei.

Solution:

The correct answer is All somatic human cells have the same amount of DNA in their nuclei.Concept:DNA: It stands for Deoxyribonucleic Acid.It is the genetic material found in most organisms and is inherited from one generation to another. It carries all the information about the anatomy (internal structure), physiology ( working of the body organs), and morphology (external appearance) of an organism. It is found inside the nucleus of the cell. Chromosome:These are the X-shaped structures visible only when the cell is in the dividing phase. They are made up of DNA. DNA condenses to form the chromosomes. Explanation:DNA in the Human body:There are two types of cells, somatic and germ cells.Somatic cells are the cells that make up the whole body while germ cells are the gametes that take part in reproduction.Somatic cells have 46 chromosomes while gametes have half of them i.e. 23 chromosomes. Some cells like RBCs ( red blood cells) lack nuclei. StatementTrue / FalseThe amount of DNA in human brain cells increases as the size of the brain increases.False, because the amount of DNA increases with an increase in the number of cells not with the size of the organ.All somatic human cells have the same amount of DNA in their nuclei.True, all somatic cells have 46 chromosomes with the nearly same amount of DNA. All human beings have the same amount of DNA in their bodies.False, some humans suffer from genetic abnormality wherein one or more chromosomes might be deleted or added. All human cells have the same amount of DNA in their nuclei.False, some cells like RBCs do not have any nuclei, gametes have half the no. of chromosomes, and some immune cells may also have mutations leading to variation in the amount of DNA.

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