Is this from 1000SC?

I am confused between what are called aperiodic tiles and what is called aperiodic tiles Is aperiodic tiles is a single term? In that case we can use 'is'.
But IMO if you are torn between two choices, better choose the original one. In A, describe is perfectly fine...turned out to describe is OK

A?

The work of mathematician Roger Penrose in the early 1970s, on the geometry of what are called aperiodic tiles, turned out to describe the architecture of a previously unknown class of crystals.

what is used as a subornidate clause in the prepositinal noun clause "on the gemometry..." and the object complement of this clause is "aperiodic complement" and hence are is the correct usage here....

rahulg83 wrote:Is this from 1000SC?

I am confused between what are called aperiodic tiles and what is called aperiodic tiles Is aperiodic tiles is a single term? In that case we can use 'is'.
But IMO if you are torn between two choices, better choose the original one. In A, describe is perfectly fine...turned out to describe is OK

As rahul pointed out if tiles is singular then "B"....else "A"....

But IMO in test conditions until and unless we have not read the word like the above tiles....then better to go with original version....

I thought "THE WORK" is the subject here, and so we need "describes" as in B

What "IS" called aperiodic tiles? That doesn't seem to be correct.

gmat740 wrote:I thought "THE WORK" is the subject here, and so we need "describes" as in B

IMO work is indeed the subject...

both the below are correct:

Work of XYZ describes....

Work of XYZ is used to describe....

IMO work is indeed the subject...

both the below are correct:

Work of XYZ describes....

Work of XYZ is used to describe....

well which one would be prefered here?

gmat740 wrote:

IMO work is indeed the subject...

both the below are correct:

Work of XYZ describes....

Work of XYZ is used to describe....

well which one would be prefered here?

IMO both of them are equally liked by GMAT as far as S-V is converned....there must be some other reason to kick out the options....

Domnu wrote:What "IS" called aperiodic tiles? That doesn't seem to be correct.

Is does not go with aperiodic tiles.

Domnu wrote:

Domnu wrote:What "IS" called aperiodic tiles? That doesn't seem to be correct.

Is does not go with aperiodic tiles.

I was wondering whether aperiodic tiles is a title(kind of) as in "Aperiodic tiles" is causing trouble to lots of geometry experts..or it is the plural of aperiodic tile..

Hope u understand what i meant to say..

After doing a little research, here is my answer to the question I asked

The two strong contenders are A and B

B. The work of mathematician Roger Penrose in the early 1970s, on the geometry of what is called aperiodic tiles, describes the architecture of a previously unknown class of crystals.

simply B is out.

Another reason why A is correct :
The work of mathematician Roger Penrose in the early 1970s, on the geometry of what are called aperiodic tiles, turned out to describe the architecture of a previously unknown class of crystals.

Well, we need here "turned out to describe"

X was intended to Y but it turned out to describe....thus, the proper meaning of the sentence is conveyed with A

Hope this helps