fill in the blank question

05rose · Posted: Tue Mar 04, 2008 12:56 am Post subject:

My answer is D.

05rose · Posted: Fri Mar 14, 2008 12:29 am Post subject:

please tell the correct answer.

OnapiIndia · Posted: Tue Mar 18, 2008 11:23 pm Post subject:

Please tell the correct answer.

yxhh2008 · Posted: Thu Mar 20, 2008 2:20 am Post subject:

what is the OA, BTW,can anybody paarphrase this sentence:no two bacterial strains on Earth are different enough to have arisen on different planets

OnapiIndia · Posted: Mon Mar 24, 2008 3:21 am Post subject:

I think it is D please tell us the correct answer.

AleksandrM · Posted: Wed Apr 02, 2008 6:22 pm Post subject: Re: fill in the blank question

Anon · Posted: Fri May 02, 2008 1:21 am Post subject: Stuart ...Need your help on this

Could you please explain why E is wrong...
and as other people have mentioned , why is D correct....

AleksandrM · Posted: Fri May 02, 2008 5:50 pm Post subject:

Mars (Fill in): It is theoretically possible that bacteria developed on Mars early in its history and that some were carried to Earth by a meteorite. However, strains of bacteria from different planets would probably have substantial differences in protein structure that would persist over time, and no two bacterial strains on Earth are different enough to have arisen on different planets.

D. All bacteria now on Earth could have arisen from transported Martian bacteria.
E. There could have been strains of bacteria that originated on Earth and later died out.

Anon,

The passage talks about a possibility of there being bacteria from Mars, which could have been carried to Earth by a meteorite. Then, it says - again, it is a probability - that bacteria from two DIFFERENT planets would have differences in structure. The whole passage is about the potential relationship of events involving two planets.

Option E attempts to see how well you have grasped the issues discussed in the passage by leading you to conclude that there is a possibility that once there was bacteria that was different in structure from bacteria presently on Earth. However, it also says that this strain of bacteria originated "on Earth and later died out." We do not care about bacteria that originated on Earth. We care about bacteria that originated from Mars.

Option D, on the other hand, returns to the potential relationship between Mars and Earth, and in part infers that perhaps the bacteria on Mars is the same in protein structure as bacteria on Earth, which would lead us to conclude that there is, once again, potential for bacteria presently on Earth to be from Mars. However, this COULD be true. As I said above, you are looking for an answer that parallels the passage in its uncertainty as it relates to a potential answer to the whole "protein structure difference" issue, and at the same time covers the topic of the passage, namely, the relationship between two planets, etc, etc, etc.

I really hope this helps.

Anon · Posted: Sun May 04, 2008 3:17 am Post subject:

Hey Alex,

Thanks for the wonderful expln...makes sense now..

Very Happy

AleksandrM · Posted: Sun May 04, 2008 5:18 am Post subject:

No problem. Glad I could help.

Ur_Sky · Posted: Sat May 24, 2008 9:10 pm Post subject: Re: fill in the blank question

netigen · Posted: Sat May 24, 2008 11:39 pm Post subject:

This is a main point question.

The conclusion is that all bacteria on earth originated on the same planet. The planet where it originated can be either earth or mars.

only D satisfies this conclusion.