Which of the following statements is INCORRECT regarding DNA?

Question

Question

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SSC Matric Level Previous Paper (Held on: 14 March 2022 Shift 1)

The bases found in DNA come in only three varieties: adenine, cytosine and guanine.
Genes are made of DNA, and so is the genome itself.
DNA is the molecule that is the hereditary material in all living cells.
DNA is a very large molecule, made up of smaller units called nucleotides.

Answer 1

The correct answer is The bases found in DNA come in only three varieties: adenine, cytosine and guanine.

Key Points

DNA
- DNA stands for Deoxyribonucleic Acid.
- There are four types of nitrogen bases;
  - i.e. Adenine (A), Thymine (T), Guanine (G), and Cytosine (C). Hence, Option 1 is incorrect.
DNA is the molecule that is the hereditary material in all living cells because it contains the genetic code which are instructions needed for an organism to grow, develop, survive and reproduce. Hence, option 3 is correct.
- So, DNA is called the blueprint of life.
DNA is made up of a polymer chain comprised of smaller monomers called nucleotides.
Each nucleotide has three-part i.e. a sugar group, a phosphate group, and a nitrogen base. Hence, option 4 is correct.
A gene consists of enough DNA to code for one protein, and a genome is simply the sum total of an organism's DNA. DNA is long and skinny, capable of contorting it into chromosomes. Hence, Option 2 is correct.