"These are vegetarian cheeses."
Translation:אלה גבינות צמחוניות.
From the Tips and Notes:
The same applies to "these" and "those": both are covered by a single word. In the plural, masculine and feminine words both use "אלה" (ele). We also teach the word אלו, which in Modern Hebrew has exactly the same meaning, although it is less common and slightly higher register than the former, אלה.
It's proper grammar, but it's not an exact translation. אלה גבינות צמחוניות means- these are vegetarian cheeses, while הגבינות האלו הן צמחוניות means- these cheeses are vegetarian.
tips and notes are your friend: http://duolingo.wikia.com/wiki/Hebrew_Skill:Determiners