Live GMAT classes with Target Test Prep start Nov 21 and Nov 22. First class free.

See classes
Target Test Prep · GMAT

Choose how you want to prepare

Learn live with an expert or move at your own pace. Every option includes the complete TTP study system.

Newsweek Readers’ Choice Awards 2026 winner: Target Test Prep, #1 Test Prep

Target Test Prep was voted #1 Best Test Prep in the 2026 Newsweek Readers’ Choice™ Awards.

★★★★★5.0563 reviews
GMATLiveTeachStarts Nov 22
Josh Braslow, Target Test Prep GMAT expert
LIVE ONLINE CLASSES

Get Ready for GMAT Test Day Faster with Live Online Classes

with Josh Braslow, 20+ years in test prep

Nov 22 · Josh Braslow
Sun · 9:30 AM to 12:30 PM ET
Included
40 hours of live online classes + 6 months of TTP OnDemand
  • Attend the first class for free
  • Every class is recorded, so you never fall behind
View classes & enroll
Limited seats availableTarget Test Prep
EALiveTeachOnDemandStart anytime
EXECUTIVE ASSESSMENT

Target Test Prep EA OnDemand

Self-paced EA prep. Study on your schedule.

EXECUTIVE ASSESSMENT

with

165+ EA score guarantee
$05-day trial no automatic billing
Schedule
Included
40 hours of live online classes plus six months of access to the complete TTP EA OnDemand course.
  • 165+ EA Score Guarantee
  • 4,100+ Quant, Verbal, and Integrated Reasoning practice questions
  • 400+ hours of in-depth video lessons
  • 3,000+ step-by-step video solutions
View EA class & enroll Start free 5-day trial
Limited cohort · enrollment openTrial includes full course accessTarget Test Prep
GMATOnDemandStart anytime
SELF-PACED MASTERCLASS

Target Test Prep GMAT OnDemand

Complete access from day one. Study on your schedule.

715+ score guarantee
$0to start then $127/mo
  • Personalized study plan and analytics
  • Thousands of lessons and practice questions

Tiny tubes

Expert replies
by rx_11 » Wed Nov 17, 2010 5:27 am
OG12TH Q136. Whereas in mammals the tiny tubes that convey nutrients to bone cells are arrayed in parallel lines, in birds the tubes form a random pattern.

(A) Whereas in mammals the tiny tubes that convey nutrients to bone cells are arrayed in parallel lines, in birds the tubes
(B) Whereas the tiny tubes for the conveying of nutrients to bone cells are arrayed in mammals in parallel lines, birds have tubes that
(C) Unlike mammals, where the tiny tubes for conveying nutrients to bone cells are arrayed in parallel lines, birds’ tubes
(D) Unlike mammals, in whom the tiny tubes that convey nutrients to bone cells are arrayed in parallel lines, the tubes in birds
(E) Unlike the tiny tubes that convey nutrients to bone cells, which in mammals are arrayed in parallel lines, in birds the tubes


OA is A

Hi, everyone,

I have a question about choice E. Hope anyone can help me. :)

Is the comparison in E parallel? I think "in birds"in the main clause is just an adverbial modifier, the sentense would not ambiguously compare the two irrelevant elements, "the tiny tubes" & " in birds". Am I wrong?

For example, in this sentense, "Like her brother, in 1997 Jim won the prize." Is the comparison in this sentense wrong? Would it seem to compare "the brother" and "the in 1997"? Hope any replies.
Join the discussion
Source: — Sentence Correction |

by Brian@VeritasPrep » Wed Nov 17, 2010 12:24 pm
Hey RX,

Good call on "in birds" simply being a modifier...but here's where the parallel comparison is wrong in E:

Item 1: The tiny tubes that convey nutrients to bone cells
Item 2: In birds the tubes

Item 2 refers to the same tubes in birds; Item 1, to be parallel, would need its own modifier to let us know when those same tubes have a different function/situation.

It would have to be:

Unlike the tubes in mammals, in birds the tubes...

Without the modifier in the first item, the second item isn't really a direct comparison, so that's a reason that E is incorrect. E is further incorrect because the modifier "which" doesn't seem to logically modify the word, "cells" that precedes it - it should logically modify "tubes" in order to be a valid comparison, and so the modifier "which" is misplaced and incorrect, too.
Brian Galvin
GMAT Instructor
Chief Academic Officer
Veritas Prep

Looking for GMAT practice questions? Try out the Veritas Prep Question Bank. Learn More.
Join the discussion

by rx_11 » Wed Nov 17, 2010 9:25 pm
Brian@VeritasPrep wrote:Hey RX,

Good call on "in birds" simply being a modifier...but here's where the parallel comparison is wrong in E:

Item 1: The tiny tubes that convey nutrients to bone cells
Item 2: In birds the tubes

Item 2 refers to the same tubes in birds; Item 1, to be parallel, would need its own modifier to let us know when those same tubes have a different function/situation.

It would have to be:

Unlike the tubes in mammals, in birds the tubes...

Without the modifier in the first item, the second item isn't really a direct comparison, so that's a reason that E is incorrect. E is further incorrect because the modifier "which" doesn't seem to logically modify the word, "cells" that precedes it - it should logically modify "tubes" in order to be a valid comparison, and so the modifier "which" is misplaced and incorrect, too.


:) Thanks, Brian,

very very very clear. Finally understand this one. :)
Join the discussion

by mundasingh123 » Sun Aug 14, 2011 1:42 am
Brian@VeritasPrep wrote:Hey RX,


Unlike the tubes in mammals, in birds the tubes...
Hi Brian , Yo said the above sentence is wrong . But how could yo compare "in birds " with "the tubes " . I ,as a non - native speaker , have been taught to believe that the first noun or article of speech " is what is being compared with .
wouldnt Unlike in mammals the tubes ... , in birds the tubes " be better ?
But this construction puts 2 prepositions unlike & in next to each other .Is this unacceptable on the GMAT . Apart from this , whats wrong with the sentence .
Could you please clarify
I Seek Explanations Not Answers
Join the discussion