A :
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1- The 1st letter of the Roman alphabet

2- The blood group whose red cells carry the A antigen

3- (biochemistry) purine base found in DNA and RNA; pairs with thymine in DNA and with uracil in RNA

4- One of the four nucleotides used in building DNA; all four nucleotides have a common phosphate group and a sugar (ribose)

5- The basic unit of electric current adopted under the Systeme International d''Unites; "a typical household circuit carries 15 to 50 amps"

6- A metric unit of length equal to one ten billionth of a meter (or 0.0001 micron); used to specify wavelengths of electromagnetic radiation

7- Any of several fat-soluble vitamins essential for normal vision; prevents night blindness or inflammation or dryness of the eyes


     

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