The amount of DNA is fixed for a particular species, as it depends upon the:
Correct answer: B. Number of chromosomes
- A. Number of individuals
- B. Number of chromosomes
- C. Number of cells
- D. Number of genes
Explanation
The correct answer is the number of chromosomes. In a given species, the amount of DNA is determined by its chromosome number, which remains constant across all individuals of that species. This is why the DNA content is fixed. Other factors like the number of individuals, cells, or genes do not determine the fixed DNA amount, as each cell of the species typically contains the same DNA content based on its chromosome number.
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The chapter covers water's polarity and biological roles, carbohydrates, lipids, proteins and nucleic acids, including their monomers, bonds, structures and functions. It also distinguishes RNA from DNA and explains conjugated molecules such as glycoproteins, glycolipids and nucleoproteins, which combine organic molecules with a non-protein component.
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