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What is a recurring pattern in DNA with a 3 dimensional structure called?
motif
Which object has the same shape as a DNA moleclue?
Probably another DNA molecule. But even then there will be monior differences. So I suggest there is nothing that is the same shape.
What viruses have the shape of an icosahedron?
Parvoviruses,papovaviruses,adenoviruses,hepadnaviruses,Herpes virus,picornaviruses,caliciviruses,Reovirus,flavioviruses&Retrovirus.Remember they are either DNA or RNA VIRUSES
What is meant by the term restriction?
Its the process of cutting DNA molecules into smaller pieces with special enzymes called Restriction Endonucleases (sometimes just called Restriction Enzymes or RE's).
What is the difference between a spiral and a helix?
"Spiral" is a general term describing a circular pathway in space. Without getting into mathematical formulas to describe the different types of spirals suffice it to say that, at the high school level, a spiral, as in the case of a whirlpool, can be seen to have a decreasing diameter along the medial axis of the spiral. In contrast, the diameter of a helix, such as a DNA molecule, is uniformly constant. Wrap a wire around a cone and then remove the cone; the shape of the wire is representative of a spiral. Wrap a wire around a cylinder and then remove the cylinder; the shape of the wire is representative of a helix. Pakrutoy
