what is ss-Dna ?
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Answers
Answer:
A DNA virus is a virus that has DNA as its genetic material and replicates using a DNA-dependent DNA polymerase. The nucleic acid is usually double-stranded DNA (dsDNA) but may also be single-stranded DNA (ssDNA). DNA viruses belong to either Group I or Group II of the Baltimore classification system for viruses. Single-stranded DNA is usually expanded to double-stranded in infected cells. Although Group VII viruses such as hepatitis B contain a DNA genome, they are not considered DNA viruses according to the Baltimore classification, but rather reverse transcribing viruses because they replicate through an RNA intermediate. Notable diseases like smallpox, herpes, and the chickenpox are caused by such DNA viruses.
Explanation:
The DNA molecules are not always double stranded helical structures, sometimes they occur in single stranded form called ssDNA. In 1959 Robert Sinsheimer discovered a unique bacteriophage called φX 174 (which infect Escherichia coli) with single stranded DNA as its genetic material. Even though the chemical composition of single stranded and double stranded DNA are the same, they also show some characteristic differences.
The present post describes the similarities and differences between dsDNA and ssDNA.s
Similarities between dsDNA and ssDNA
Ø Both dsDNA and ssDNA can acts as genetic material
Ø Both are polymers of nucleic acids
Ø The sugar molecule in both the case is deoxyribose
Ø Both contain purines and pyramidines
Ø Both ssDNA and dsDNA contain the nitrogen bases A, G, T and C
Ø Both can absorb UV light
Difference between dsDNA vs ssDNA
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View Comments (1)
Jadoon Khan says: 15/03/2018 at 1:13 PM
Really very Informative and Easily Understandable...
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