GMAT Question of the Day - Daily to your Mailbox; hard ones only

It is currently 21 Mar 2019, 13:04

Close

GMAT Club Daily Prep

Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track
Your Progress

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.

Close

Request Expert Reply

Confirm Cancel

In an experiment designed to show how life may have begun on Earth, sc

  new topic post reply Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:

Hide Tags

 
Manager
Manager
avatar
G
Joined: 22 Jun 2017
Posts: 178
Location: Argentina
Schools: HBS, Stanford, Wharton
Premium Member Reviews Badge
In an experiment designed to show how life may have begun on Earth, sc  [#permalink]

Show Tags

New post Updated on: 26 Feb 2019, 09:44
00:00
A
B
C
D
E

Difficulty:

  55% (hard)

Question Stats:

61% (02:19) correct 39% (02:15) wrong based on 36 sessions

HideShow timer Statistics

In an experiment designed to show how life may have begun on Earth, scientists demonstrated that an electrical spark-or lightning-could produce amino acids, the building blocks of Earth's life. However, unless the spark occurs in a "reducing" atmosphere, that is, one rich in hydrogen and lean in oxygen, amino acids do not form readily and tend to break apart when they do form. Scientists now believe that Earth's atmosphere was actually rich in oxygen and lean in nitrogen at the time life began.

Assuming that the scientists' current belief about Earth's atmosphere at the time life began is correct, which one of the following, if true, would most help to explain how lightning could have produced the first amino acids on Earth?


(A) Meteorite impacts at the time life began on Earth temporarily created a reducing atmosphere around the impact site.

(B) A single amino acid could have been sufficient to begin the formation of life on Earth.

(C) Earth's atmosphere has changed significantly since life first began.

(D) Lightning was less common on Earth at the time life began than it is now.

(E) Asteroids contain amino acids, and some of these amino acids could survive an asteroid's impact with Earth.

_________________

The HARDER you work, the LUCKIER you get.


Originally posted by patto on 26 Feb 2019, 09:27.
Last edited by Bunuel on 26 Feb 2019, 09:44, edited 1 time in total.
Formatted.
Manager
Manager
User avatar
P
Joined: 17 Oct 2016
Posts: 242
Location: India
Concentration: General Management, Healthcare
GMAT 1: 640 Q40 V38
GMAT 2: 680 Q48 V35
GPA: 3.05
WE: Pharmaceuticals (Health Care)
Premium Member Reviews Badge CAT Tests
Re: In an experiment designed to show how life may have begun on Earth, sc  [#permalink]

Show Tags

New post 26 Feb 2019, 09:44
In an experiment designed to show how life may have begun on Earth, scientists demonstrated that an electrical spark-or lightning-could produce amino acids, the building blocks of Earth's life (So you need amino acids for starting life, and sparks/lightning produces it). However, unless the spark occurs in a "reducing" atmosphere, that is, one rich in hydrogen and lean in oxygen, amino acids do not form readily and tend to break apart when they do form (reducing atmosphere is necessary for spark to form stable amino acid). Scientists now believe that Earth's atmosphere was actually rich in oxygen and lean in nitrogen at the time life began (But earths atmosphere was not "Reducing" at the time when amino acids formed).

Assuming that the scientists' current belief about Earth's atmosphere at the time life began is correct, which one of the following, if true, would most help to explain
how lightning could have produced the first amino acid on Earth?

So we need something that may explain why amino acids formed in non reducing atmosphere OR How reducing atmosphere was developed/generated?

(A) Meteorite impacts at the time life began on Earth temporarily created a reducing atmosphere around the impact site. (CORRECT: Explains our prethinking)

(B) A single amino acid could have been sufficient to begin the formation of life on Earth. (Wrong: Does not explain HOW exactly that ONE amino acid formed)

(C) Earth's atmosphere has changed significantly since life first began. (Wrong: Atmosphere has CHANGED SINCE life began, implies that atmosphere was oxygen rich when life began and does not explain how reducing atmosphere was provided)

(D) Lightning was less common on Earth at the time life began than it is now. (Wrong: does not explain role of reducing atmosphere)

(E) Asteroids contain amino acids, and some of these amino acids could survive an asteroid's impact with Earth. (WRONG: the argument is not considering aminoacids from asteroids: Out of scope)
_________________

_____________________
Chasing the dragon

GMAT Club Bot
Re: In an experiment designed to show how life may have begun on Earth, sc   [#permalink] 26 Feb 2019, 09:44
Display posts from previous: Sort by

In an experiment designed to show how life may have begun on Earth, sc

  new topic post reply Question banks Downloads My Bookmarks Reviews Important topics  


Copyright

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

Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne

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®.