Find all School-related info fast with the new School-Specific MBA Forum
Learn more about the recent changes... close

It is currently 18 Jun 2013, 16:44
Customize  |  Hide

Search
Register
New posts
Unanswered

Light is registered in the retina when photons hit molecules

  Question banks Downloads My Bookmarks Reviews  
  Oldest Best Reply
Search for:
 
Print view
First unread post
Author Message
TAGS:
Director
Director
Joined: 18 Feb 2008
Posts: 508
Location: Kolkata
Followers: 5

Kudos [?]: 50 [0], given: 66

GMAT Tests User
Light is registered in the retina when photons hit molecules [#permalink] New post 14 May 2008, 20:13
00:00

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions
Light is registered in the retina when photons hit molecules of the pigment rhodopsin and change the molecules’ shape. Even when they have not been struck by photons of light, rhodopsin molecules sometimes change shape because of normal molecular motion, thereby introducing error into the visual system. The amount of this molecular motion is directly proportional to the temperature of the retina.
Which one of the following conclusion is most strongly supported by the information above?
(A) The temperature of an animal’s retina depends on the amount of light the retina is absorbing.
(B) The visual systems of animals whose boy temperature matches that of their surroundings are more error-prone in hot surroundings than in cold ones.
(C) As the temperature of the retina rises, rhodopsin molecules react more slowly to being struck by photons.
(D) Rhodopsin molecules are more sensitive to photons in animals whose retinas have large surface areas than in animals whose retinas have small surface areas.?
(E) Molecules of rhodopsin are the only pigment molecules that occur naturally in the retina.


Got confused between two choices.Explanations friends.Thanks in advance. :)
Manager
Manager
Joined: 26 Apr 2008
Posts: 50
Followers: 1

Kudos [?]: 2 [0], given: 0

Re: Cr_retina [#permalink] New post 14 May 2008, 20:50
B is the clear winner.
Higher retina temperature -> higher error
higher surrounding temp -> higher body temp -> higher retina temp -> higher error.
Manager
Manager
User avatar
Joined: 31 Oct 2007
Posts: 116
Followers: 1

Kudos [?]: 8 [0], given: 0

Re: Cr_retina [#permalink] New post 14 May 2008, 20:56
Quote:
(A) The temperature of an animal’s retina depends on the amount of light the retina is absorbing.
(B) The visual systems of animals whose boy temperature matches that of their surroundings are more error-prone in hot surroundings than in cold ones.
(C) As the temperature of the retina rises, rhodopsin molecules react more slowly to being struck by photons.
(D) Rhodopsin molecules are more sensitive to photons in animals whose retinas have large surface areas than in animals whose retinas have small surface areas.?
(E) Molecules of rhodopsin are the only pigment molecules that occur naturally in the retina.

The answer should strengthen. That is temperature causes more molecular motion. That is more error.

Answer should have temperature. Eliminate D, E
C - Negative answer- Eliminate
A- This one is tricky. But wrong. A causes B. To strengthen it, we cannot say B causes A. So actually it is a weakening answer. - Eliminate

Answer B.
_________________

Many people dream, but some wake up and work towards it.

Director
Director
Joined: 30 Jun 2007
Posts: 793
Followers: 1

Kudos [?]: 84 [0], given: 0

GMAT Tests User
Re: Cr_retina [#permalink] New post 14 May 2008, 21:00
Argument: Eye registers light when photons hit molecules of rosp. + change molecule’s shape
If temperature changes (increases) – this increases changes molecule’s shape without serving photons hit.

(A) The temperature of an animal’s retina depends on the amount of light the retina is absorbing. [Definitely not – as per the argument even when retina is not absorbing light, it’s under molecule’s change – eliminate it]
(B) The visual systems of animals whose boy temperature matches that of their surroundings are more error-prone in hot surroundings than in cold ones. [Too extreme – here underlying assumption is body temperature affects eye temperature – eliminate it]
(C) As the temperature of the retina rises, rhodopsin molecules react more slowly to being struck by photons. [Hold it]
(D) Rhodopsin molecules are more sensitive to photons in animals whose retinas have large surface areas than in animals whose retinas have small surface areas.? [Not per argument – eliminate it]
(E) Molecules of rhodopsin are the only pigment molecules that occur naturally in the retina. [Not stated in argument - Eliminate it]

Answer: C
Senior Manager
Senior Manager
Joined: 19 Apr 2008
Posts: 325
Followers: 3

Kudos [?]: 24 [0], given: 0

GMAT Tests User
Re: Cr_retina [#permalink] New post 14 May 2008, 22:16
A by POE

B , D, E - out of scope
if i understand this right , C is refuting the conclusion that The amount of this molecular motion is directly proportional to the temperature of the retina.
Senior Manager
Senior Manager
User avatar
Joined: 16 Aug 2004
Posts: 343
Location: India
Followers: 1

Kudos [?]: 31 [0], given: 0

GMAT Tests User
Re: Cr_retina [#permalink] New post 15 May 2008, 01:24
Answer option C. Will provide explanation if the answer is correct.
CEO
CEO
User avatar
Joined: 17 May 2007
Posts: 2998
Followers: 48

Kudos [?]: 391 [0], given: 210

GMAT Tests User
Re: Cr_retina [#permalink] New post 16 May 2008, 07:28
Going for B here. OA ?
Director
Director
Joined: 18 Feb 2008
Posts: 508
Location: Kolkata
Followers: 5

Kudos [?]: 50 [0], given: 66

GMAT Tests User
Re: Cr_retina [#permalink] New post 16 May 2008, 08:37
Oa is b...i went for c though. :cry:
Director
Director
Joined: 06 Jan 2008
Posts: 559
Followers: 1

Kudos [?]: 47 [0], given: 2

GMAT Tests User
Re: Cr_retina [#permalink] New post 16 May 2008, 10:44
Good one. Agree with B.
Thanks :-D
Re: Cr_retina   [#permalink] 16 May 2008, 10:44
    Similar topics Author Replies Last post
Similar
Topics:
 New posts When to register for GMAT? Subbu 1 25 Sep 2004, 13:38
New posts Light is registered in the retina when photons hit molecules tarek99 8 17 Nov 2008, 04:29
Popular new posts Experts publish their posts in the topic Light is registered in the retina when photons hit molecules noboru 24 08 Dec 2010, 11:34
New posts Experts publish their posts in the topic light is registered in the retina StevenChen 5 18 Sep 2012, 14:00
New posts 2 Experts publish their posts in the topic Light is registered in the retina when photons hit molecules getgyan 2 19 Sep 2012, 03:27
Display posts from previous: Sort by

Light is registered in the retina when photons hit molecules

  Question banks Downloads My Bookmarks Reviews  
Print view
First unread post

Moderators: tuanquang269, RaviChandra, Vercules, Legendaddy, noboru, Marcab, metallicafan, rajeevrks27, willigetmylifeback, mikemcgarry, souvik101990, doe007, MacFauz, PTK, carcass, kissthegmat, Narenn

Search for:


GMAT Club MBA Forum Home| About| Privacy Policy| Terms and Conditions| GMAT Club Rules| Contact| Sitemap

Powered by phpBB © phpBB Group and phpBB SEO

Kindly note that the GMAT® test is a registered trademark of the Graduate Management Admission Council®, and this site has neither been reviewed nor endorsed by GMAC®.

Main navigation

GMAT Resources

Partners

MBA Resources

www.gmac.com|www.mba.com