DNA is the hereditary material of all living organisms . ... All segments of DNA code for synthesis of proteins. 3. Nuclear DNA is double helical with two nucleotide chains which run anti-parallel.
Which is correct about DNA?
DNA is the hereditary material of all living organisms . ... All segments of DNA code for synthesis of proteins. 3. Nuclear DNA is double helical with two nucleotide chains which run anti-parallel.
Which of the following statement is not applicable for DNA replication?
When an incorrect base pair is recognized, DNA polymerase moves backward by one base pair of DNA. The 3’–5′ exonuclease activity of the enzyme allows the incorrect base pair to be excised (this activity is known as proofreading). So, the incorrect statement is “ D “.
Which of the following is not a part of DNA?
Molecules of DNA are composed of long chains of.... Which of the following is not part of a molecule of DNA? A sugar, a phosphate group, and a nitrogen base .
Which one of the following statement is incorrect for Z DNA?
Which one of the following statement is INCORRECT for Z-DNA? Explanation: Anti glycosidic bond conformation is incorrect as in Z-DNA the sugar and glycosidic bond conformations alternate, anti for C and syn for G while in B form there is only anti glycosidic bond conformation.
Which sugar is present in DNA?
The sugar in deoxyribonucleic acid (DNA) is deoxyribose . The deoxy prefix indicates that the 2′ carbon atom of the sugar lacks the oxygen atom that is linked to the 2′ carbon atom of ribose (the sugar in ribonucleic acid, or RNA), as shown in Figure 5.2.
When was DNA first used?
In 1986 was when DNA was first used in a criminal investigation by Dr. Jeffreys. 1986. The investigation used genetic fingerprinting in a case of two rapes and murders that had happened in 1983 and 1986.
What are the three major steps in DNA replication?
How is DNA replicated? Replication occurs in three major steps: the opening of the double helix and separation of the DNA strands, the priming of the template strand, and the assembly of the new DNA segment .
Where does DNA replication occur?
DNA replication occurs in the cytoplasm of prokaryotes and in the nucleus of eukaryotes . Regardless of where DNA replication occurs, the basic process is the same. The structure of DNA lends itself easily to DNA replication. Each side of the double helix runs in opposite (anti-parallel) directions.
What are the minimum requirements for DNA replication?
There are four basic components required to initiate and propagate DNA synthesis. They are: substrates, template, primer and enzymes .
Is amino acid present in DNA?
Hidden within the genetic code lies the “triplet code,” a series of three nucleotides that determine a single amino acid. It had long been known that only 20 amino acids occur in naturally derived proteins. ...
What is found in DNA?
The information in DNA is stored as a code made up of four chemical bases: adenine (A), guanine (G), cytosine (C), and thymine (T) . ... DNA bases pair up with each other, A with T and C with G, to form units called base pairs. Each base is also attached to a sugar molecule and a phosphate molecule.
Which is not A DNA base?
Uracil is not found in DNA. Uracil is only found in RNA where it replaces Thymine from DNA.
Is Z-DNA found in humans?
Z-DNA formation could possibly influence transcription by acting as a physical barrier for polymerase progression as seen in the case of prokaryotic systems (Peck and Wang 1985). In human cells, Z-DNA was found to form in actively transcribed regions of the genome and was confirmed using ChIP-Seq (Shin et al.
Which of the following statement about DNA is are correct?
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.
Why is Z-DNA zigzag?
Z-DNA (default scene) is a form of DNA that has a different structure from the more common B-DNA form.It is a left-handed double helix wherein the sugar-phosphate backbone has a zigzag pattern due to the alternate stacking of bases in anti-conformation and syn conformation .
