Question

Is anyone good in biology who can help me?

Answer 1

Me!

Answer 2

and @ericanoel912

Answer 3

:) thank you! what do ya need?

Answer 4

welcome

Answer 5

okay i will post the questions down here i'm not good in biolofy at all and i need this course so badly

Answer 6

awe:( we canhelp ya!:)

Answer 7

we got you! :)

Answer 8

okay and if you can also explain it to me for the fuure too please and here is the question

What does it mean when scientists say that living organisms share a universal genetic code?


thanks

Answer 9

it's not that i don't want to learn but im home schooled so i have to teach my self this stuff and when i read the lessons it's like it comes in to my brain and leaves right away so i understand nothing

Answer 10

All living organisms have a shared ancestor deep in the past, so all living organisms are related to some degree. We might share 99.8% DNA with chimps, but we also share maybe (just a guess, I don't remember the exact number) 24% DNA with lettuce. If all living organisms are related, than their genetic code is universal - one and the same for all organisms.

Answer 11

I totally get that... and well everything that's living has DNA and if you're going by the theory of Darwinian evolution, all of us have come from the same cells in the "primordial soup"

Answer 12

Oh okay thank you i thought it's means that hey share the same DNA so they are like 100% alike in DNA

Answer 13

can i ask more?

Answer 14

sure:)

Answer 15

How does a universal genetic code relate to the hypotheses about the origin of life on Earth

Answer 16

That the genetic code is universal - that it is shared by all life forms on earth - suggests that life evolved once and only once and that all contemporary life forms descended from that same ancestor.

Answer 17

okay and i have like 3 more if it's okay you can help me?

Answer 18

How are self-replicating molecules, such as RNA molecules in the “RNA World” hypothesis, essential to the most popular hypotheses about the origin of life on Earth

Answer 19

ok give me 1 sec

Answer 20

sure

Answer 21

You got half your answer inside your question. :-)

Most hypotheses about the origin of life on earth state that it arose from inanimate matter. Now, the nucleobases that make up RNA can be built out of the containments of the primordial soup.

the key step to life is a molecule that can rebuild itself. and as we know, RNA-polymerase consists mostly of RNA. these fact indicated that a world must've existed once, where the role of proteins was also taken bei RNA molecules. but this set aside, the essential part is that RNA can be built from ingredients of the primordial soup, and that RNA is the key molecule on the way from inanimate matter to life.

Answer 22

any other questions?

Answer 23

yes sorry i took too long i was helping somone in math but i got 2 more

Answer 24

How might similarities and differences in genetic codes, or the proteins built as a result of these codes, be used to determine how closely related different species are?

Answer 25

okay your fine:)

Answer 26

DNA sequences (and the protein amino acid sequences they encode), change by accumulating mutations over many generations. So the more similar 2 DNA sequences are, the more recently they shared a common ancestor. Look up molecular clock.

Answer 27

do you want me to look it up now?

Answer 28

sure

Answer 29

here while i'm looking at it now you can answer this last one please

Based on the amino acid sequence data for the Cytochrome-C protein, chimpanzees and humans share an identical coding sequence. What other species identified on the chart has a coding sequence that is most closely related to the humans and chimpanzees AND most distantly related? Explain your answer.

Answer 30

okay so molecular clock is basically a technique

Answer 31

was there a chart??

Answer 32

yeah

Answer 33

I think you're missing the chart here. But when you are comparing how related certain organisms are, you should look at evolutionary trees about them. Cytochrome-C is an important protein, but mutations occur in its amino acid sequence on a certain, estimated rate(so in a way this works as a molecular clock that can be used to track how long it has been since two species shared a common ancestor). So the fewer mutations (changes in nucleotides) there are the more closely two organisms are actually related.
okay Im not too sure about this one I had to look this one up but I hope this paragraph andswers this ill see if anyone knows :)

Answer 34

thanks ill do that one since i have the graph