Which of the following statements about dna is (are) true?

Which of the following statements about DNA is/are correct?1) DNA is the hereditary material of all living organisms.2) All segments of DNA code for the synthesis of proteins.3) Nuclear DNA is double helical with two nucleotide chains that run anti-parallel.4) DNA is also found in mitochondria. Select the correct answer using the code given below:

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Which of the following statements about DNA is/are correct?1) DNA is the hereditary material of all living organisms.2) All segments of DNA code for the synthesis of proteins.3) Nuclear DNA is double helical with two nucleotide chains that run anti-parallel.4) DNA is also found in mitochondria. Select the correct answer using the code given below:
Answer (Detailed Solution Below)
The correct options are AIt has a double helix structure.BIt undergoes replication.DIt contains the 2-deoxyribose pentose sugar.The two strands in DNA molecule are complementary to each other.
Which of the following statement is true for DNA?
Which of the following statement is false about DNA?
Is DNA the hereditary material of all living organisms?
Does DNA contain thymine?

NDA (Held On: 17 Apr 2016) General Ability Test Previous Year paper

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1, 2 and 3 only
3 and 4 only
1, 3 and 4 only
4 only

Answer (Detailed Solution Below)

Option 2 : 3 and 4 only

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The correct answer is option 2, i.e 3 and 4 only.

The basic of DNA

Molecular genetics emerged from the realization that DNA and RNA both constitute the genetic material of all living organisms. Hence statement 1 is NOT correct.
DNA is called the blueprint of life because it contains the genetic code which are instructions needed for an organism to grow, develop, survive and reproduce.
DNA stores the genetic information of the cell in the sequence of its 4 bases that is adenine, thymine, guanine, and cytosine.
The information in a small segment of DNA i.e.a gene is sent by mRNA to the ribosome to synthesize a protein. Hence statement 2 is NOT correct.
Deoxyribonucleic acid 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.
There are four sorts of nitrogen bases i.e. adenine (A), thymine (T), guanine (G), and cytosine (C).
DNA has a double-helical structure with two nucleotide chains that run anti-parallel, the outer edges are formed by alternating deoxyribose sugar molecules and phosphate groups, which make up the sugar-phosphate backbone. Hence statement 3 is correct.
Mitochondrial DNA or mtDNA is that the small circular chromosome found inside mitochondria. Hence statement 4 is correct.

1,2 and 3 only3 and 4 only1,3 and 4 only4 only

Answer : B

Solution : Not all viruses have DNA e.g. HIV virus. It is double helical structure with two nucleotide chain which runs anti-parallel. DNA is also present in mitochondria. Only some segments of DNA code for proteins.

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It has a double helix structure.

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It undergoes replication.

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The two strands in DNA molecule are exactly similar

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It contains the 2-deoxyribose pentose sugar.

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Solution

The correct options are AIt has a double helix structure.BIt undergoes replication.DIt contains the 2-deoxyribose pentose sugar.The two strands in DNA molecule are complementary to each other.

Which of the following statement is true for DNA?

DNA has a double-helical structure with two nucleotide chains that run anti-parallel, the outer edges are formed by alternating deoxyribose sugar molecules and phosphate groups, which make up the sugar-phosphate backbone. Hence statement 3 is correct.

Which of the following statement is false about DNA?

The answer choice that is false is d. The DNA of cells, whether prokaryotic or eukaryotic, consists of two strands of nucleotides that twist into a double helix. Some viruses, which are not cellular entities, have genomes of single stranded DNA.

Is DNA the hereditary material of all living organisms?

DNA, or deoxyribonucleic acid, is the hereditary material in humans and almost all other organisms. Nearly every cell in a person's body has the same DNA.

Does DNA contain thymine?

Thymine (T) is one of the four nucleotide bases in DNA, with the other three being adenine (A), cytosine (C) and guanine (G). Within a double-stranded DNA molecule, thymine bases on one strand pair with adenine bases on the opposite strand.