Destroyer Bio 247

[Mstoothlady2012]

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Is this statement true?

Most scientists believe that RNA was utilized as the genetic information before DNA developed.

I thought proteins were believed as genetic information carriers before DNA😕

 

[Mstoothlady2012]

Bio # 254 - I didn't know fetus can breathe 😱

 

[TeamGuo]

yea RNA is believed to be the first genetic material. In the cental dogma that's the only place where you can go backward, hence reverse transcriptase exists.

And fetus can breathe if they don't they would die. They have fetal circulation. Only thing about this question is that fetus doesn't have lungs... hmm... so they wouldn't have alveoli so wouldn't have surfactants.

If anyone can verify fetus having alveoli would be great.

 

[Mstoothlady2012]

Fetus have lungs but they are not functional, hence they don't breathe. They depend on their mother for O2.

 

[Danny289]

yes it is true, check with your text book
campbell six eddition page 519 ( sorry I have old version!) title:
"RNA may have been the first genetic material"
second question:
you can call it mistake in Destroyer or bad wording: fetus has lungs, the first expanding will be immidately and painfull(the first crying 🙂) after born. if you change the first statement from "fetus" to "newborn" you are set.
hope it helped 👍

 

[Mstoothlady2012]

yes it is true, check with your text book
campbell six eddition page 519 ( sorry I have old version!) title:
"RNA may have been the first genetic material"
second question:
you can call it mistake in Destroyer or bad wording: fetus has lungs, the first expanding will be immidately and painfull(the first crying 🙂) after born. if you change the first statement from "fetus" to "newborn" you are set.
hope it helped 👍

Yea the second sentence is definitely a mistake. Yea switching the word fetus with newborn makes the statement true. Thanks!