BIOLOGY
NUCLEIC ACIDS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Has a double helix
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Has a single helix
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Contains uracil
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None of the above
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Detailed explanation-1: -Double helix, as related to genomics, is a term used to describe the physical structure of DNA. A DNA molecule is made up of two linked strands that wind around each other to resemble a twisted ladder in a helix-like shape. Each strand has a backbone made of alternating sugar (deoxyribose) and phosphate groups.
Detailed explanation-2: -The double-helix shape allows for DNA replication and protein synthesis to occur. In these processes, the twisted DNA unwinds and opens to allow a copy of the DNA to be made. In DNA replication, the double helix unwinds and each separated strand is used to synthesize a new strand.
Detailed explanation-3: -Answer and Explanation: The correct option: The structure which is not true for a DNA molecule is B. Single-stranded. The structure of a DNA molecule is formed with the combining of two strands to form its characteristic double helix.
Detailed explanation-4: -Answer and Explanation: Of the following the only that is true about DNA is that it is located in the nucleus of our cells. DNA is made up of nitrogenous bases, phosphates and sugars. The first step of gene expression requires the unzipping of the double helix for the RNA polymerase to synthesize messenger RNA.