I know this is an old threat, but I think the issue you're encountering is that there are really three different scales referred to as minor. The most basic is the aeolian mode, or the natural minor scale. This is the scale created using the white keys from a to a on a piano. In jazz and pop, this scale is often substituted with the dorian mode, but I digress.
The second minor scale is the harmonic minor scale. This scale is identical to the natural minor with the exception of a raised 7th. The a harmonic minor scale would be all the white keys from a to a, except the g is replaced with a g#. This is because the raised seventh (which serves the leading tone purpose as in the major scale) allows for the powerful dominant and leading tone chords to function harmonically in a minor key. This has the effect of including the V7 or simply the major V chord in minor keys. 99% of classical music uses a major V. In popular music, the major V chord is a very common chord in minor because our ears are very used to its existence in western music.
The third minor scale is melodic minor, which includes a raised 6th degree as well as the 7th. In that sense it sounds minor for the first half and major for the second half. This is really used mostly in jazz and exists to the avoid the awkward augmented second interval in the harmonic minor scale between degrees 6 and 7. Sometimes you flatten those scale degrees when descending, sometimes not, depends who you ask.
Hope that helps.