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New strands of DNA are formed only in th...

New strands of DNA are formed only in the .................. direction.

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**Step-by-Step Solution:** 1. **Understanding DNA Structure**: DNA is made up of nucleotides, which consist of a deoxyribose sugar, a phosphate group, and a nitrogenous base. The sugar has carbon atoms numbered 1' through 5'. 2. **Identifying the Directionality**: In DNA, the strands have directionality. The 5' end has a phosphate group attached to the 5' carbon of the sugar, and the 3' end has a hydroxyl (OH) group attached to the 3' carbon. 3. **Formation of Phosphodiester Bonds**: When new nucleotides are added to a growing DNA strand, they form phosphodiester bonds. This occurs between the phosphate group of the incoming nucleotide and the hydroxyl group on the 3' carbon of the last nucleotide in the chain. ...
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Strands of DNA are bonded by

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New strand on a DNA template is initiated by

DNA strands are joined by

Fill in the blanks : (i) According to Watson and Ctick model, the DNA molecule consists of ............... long, parallel strands. The two strands are .............. around a common axis in a regular manner to form a ........... helix. (ii) These strands are made of ............ units. Each such unit consists of .......... , ......... and ............. (iii) In each chain, nitrogenous base molecules are joined to the sugar molecules by ............ bonds and project into the space enclosed in the helix at about .......... to the long axis of the helix. (iv) The nitrogenous bare may be a 9-membered, double ringed ....... or a 6-membered, single ringed ....... (v) The double helix of DNA has a constant diameter of ......... and one complete spiral (turn) of the helix is .......... long and has ........ base pairs. (vi) The mode of DNA replication is ........... (vii) Enzyme ............ cannot initiate the synthesis of a new DNA strand, although it can catalyze the growth of a DNA chain. Therefore, a short chain of .......... is formed on the DNA template at the 5' end. This is called ........ (viii) During DNA replication, one new strand is formed in continuous stretch in the 5' - 3' direction. It is called ........... strand. Other strand is formed in small fragments called .......... which are later joined to form a continuous strand termed ............ strand.

Are the two strands of DNA molecule identical ?

(a) Differentiate between a template strand and coding strand of DNA. (b) Name the source of energy for the replication of DNA

MODERN PUBLICATION-MOLECULAR BASIS OF INHERITANCE -QUICK MEMORY TEST (Complete The Missing Links)
  1. The experiment on DNA using ""^(15)N isotope proved that its replicati...

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  2. ..................... are enzymes that unwind DNA helices while .........

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  3. New strands of DNA are formed only in the .................. direction...

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  4. The unidirectional flow of genetic information from DNA to RNA to prot...

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  5. ................. .................. is the process in which informat...

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  6. A sequence of three nitrogen bases that code for an amino acid is a .....

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  7. .................. is a segment of DNA strand on which a new strand is...

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  8. One gene-one enzyme concept is now more accurately referred to as one ...

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  9. .......................... in RNA replaces thymine in DNA.

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  10. ......................... has the shape of clover-leaf.

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  11. The formation of a peptide bond is catalysed by the enzyme ..............

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  12. Genes that shuffle from one location to another are called ..............

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  13. One gene-one enzyme hypothesis has been changed to ......................

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  14. Viruses ate .................. obligate parasites.

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  15. The genes and polypeptide codes are for collinear was proved by .........

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  16. Phages infect the .................. cells.

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  17. The protein coat of virus is called ...................

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  18. .................... are arranged in linear order on chromosomes.

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  19. In bacteria, regulation of gene expression is usually affected through...

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  20. ..................... is the phenomenon by which the synthesis of a se...

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