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...Double-acting" die assembly The blank is produced in the same die. The outside punch acts as a blank holder. [Diagrams to demonstrate 'Deep drawing' - see article] Manufacture: Drawing is a process of forming flat sheet blanks into hollow shapes by means of a punch that causes the metal to be formed into the die cavity. If the depth is one or more times the diameter of...

...double-stranded DNA, the genomes of viruses can be constituted from either DNA or RNA and may be double- or single-stranded molecules. Usually, DNA is a double-stranded molecule with paired, complementary strands (dsDNA) and RNA is a single stranded molecule (ssRNA). However, some viruses have single-stranded DNA genomes (ssDNA) and some have double-stranded RNA genomes...

...double helix molecule, which comprises a linear sequence of base pairs. SAQ 1 What is the basic (primary) structure of a protein? Answer A protein is a linear sequence of amino acids. There is a direct and specific relationship between the linear sequence of base pairs that makes up a gene, and the linear sequence of amino acids in a protein molecule. This relationship,...