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01
un, una
used when we want to talk about a person or thing for the first time or when other people may not know who or what they are
Example
She bought a new book yesterday.
Ella compró un nuevo libro ayer.
She found a job at a company downtown.
Ella encontró un trabajo en una empresa en el centro.
1.1
un, una
used before a noun when we are not talking about a specific person or thing
Example
He has a problem that needs solving.
Él tiene un problema que necesita solución.
She brought a gift for the birthday party.
Ella trajo un regalo para la fiesta de cumpleaños.
02
un, una
used to show someone or something belongs to a group or type
Example
He is a member of a sports club.
Él es un miembro de un club deportivo.
He is a student in the university.
Él es un estudiante en la universidad.
01
la, el
the musical pitch A, which is a specific note in the diatonic scale commonly used in Western music
02
ångström, ångströms
a metric unit of length equal to one ten billionth of a meter (or 0.0001 micron); used to specify wavelengths of electromagnetic radiation
03
el grupo sanguíneo A, sangre tipo A
the blood group whose red cells carry the A antigen
04
la letra A, el carácter A
the 1st letter of the Roman alphabet
05
nucleótido, nucleótido A
one of the four nucleotides used in building DNA; all four nucleotides have a common phosphate group and a sugar (ribose)
06
adenina, base adenina
(biochemistry) purine base found in DNA and RNA; pairs with thymine in DNA and with uracil in RNA
