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May 03, 2024, 05:46:47 pm
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Author Topic: HSC Biology Question Thread  (Read 348247 times)  Share 

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Blissfulmelodii

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Re: Biology Question Thread
« Reply #345 on: October 18, 2016, 02:32:24 pm »
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Hey guys
Quick question. Is comparative DNA sequencing the same thing as DNA hybridisation??
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kimmie

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Re: Biology Question Thread
« Reply #346 on: October 18, 2016, 03:21:49 pm »
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Hey guys so I have always been confused on how to draw transverse and longitudinal sections of phloem and xylem tissue. Can someone please show me how to draw them? Because I always get them wrong  :-X
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Skidous

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Re: Biology Question Thread
« Reply #347 on: October 18, 2016, 03:32:33 pm »
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Quote from: Blissfulmelodii on October 18, 2016, 02:32:24 pm
Hey guys
Quick question. Is comparative DNA sequencing the same thing as DNA hybridisation??

No, DNA Sequencing is just the sequencing of the base pairs.

DNA Hybridisation is matching up the DNA from 2 different species and testing the matches and mismatches (less=closely related) and the difficulty in separation (increased difficulty = closely related)
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kevin217

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Re: Biology Question Thread
« Reply #348 on: October 18, 2016, 03:35:11 pm »
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Quote from: Skidous on October 18, 2016, 03:32:33 pm
No, DNA Sequencing is just the sequencing of the base pairs.

DNA Hybridisation is matching up the DNA from 2 different species and testing the matches and mismatches (less=closely related) and the difficulty in separation (increased difficulty = closely related)
Wait aren't you describing DNA sequencing still?
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Skidous

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Re: Biology Question Thread
« Reply #349 on: October 18, 2016, 03:38:10 pm »
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Quote from: kimmie on October 18, 2016, 03:21:49 pm
Hey guys so I have always been confused on how to draw transverse and longitudinal sections of phloem and xylem tissue. Can someone please show me how to draw them? Because I always get them wrong  :-X

Transverse


Longitudinal


Both


An easy way to remember
Transverse is circular
Longitudinal is rectangular
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kevin217

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Re: Biology Question Thread
« Reply #350 on: October 18, 2016, 03:38:33 pm »
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Quote from: Blissfulmelodii on October 18, 2016, 02:32:24 pm
Hey guys
Quick question. Is comparative DNA sequencing the same thing as DNA hybridisation??
FYI DNA sequencing can be part of BP1 where you have to analyse how advances in technology have changed scientific thinking about evolution. It allowed scientists to find similarities between humans and apes, thus a closer evolutionary relationship.
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Skidous

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Re: Biology Question Thread
« Reply #351 on: October 18, 2016, 03:39:57 pm »
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Quote from: kevin217 on October 18, 2016, 03:35:11 pm
Wait aren't you describing DNA sequencing still?

No DNA sequencing only talks about the base pairs on a single organism. So you can compare just base pairs

DNA Hybridisation actually combines 2 strands of DNA from DIFFERENT species and then tested to see how difficult it is to separate them.

I made a mistake in the first one my apologies

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Blissfulmelodii

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Re: Biology Question Thread
« Reply #352 on: October 18, 2016, 03:41:23 pm »
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Quote from: kevin217 on October 18, 2016, 03:35:11 pm
Wait aren't you describing DNA sequencing still?

Okay that makes sense but then how is comparative DNA sequencing used in biochemistry to show evolution?
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kevin217

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Re: Biology Question Thread
« Reply #353 on: October 18, 2016, 03:45:37 pm »
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Quote from: Blissfulmelodii on October 18, 2016, 03:41:23 pm
Okay that makes sense but then how is comparative DNA sequencing used in biochemistry to show evolution?
I don't know if you saw my other post. But scientists will compare the bases of DNA strands from two different species. The more similar the bases are, the more closely related the two organisms are with each other. This supports common ancestry and thus evolution.
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Blissfulmelodii

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Re: Biology Question Thread
« Reply #354 on: October 18, 2016, 04:40:32 pm »
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Quote from: kevin217 on October 18, 2016, 03:45:37 pm
I don't know if you saw my other post. But scientists will compare the bases of DNA strands from two different species. The more similar the bases are, the more closely related the two organisms are with each other. This supports common ancestry and thus evolution.

Yeah that's DNA hybidisation right?
So what is Comparative DNA sequencing? Isn't it the same thing?
Sorry I'm so confused right now
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kimmie

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Re: Biology Question Thread
« Reply #355 on: October 18, 2016, 04:49:11 pm »
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So which parts are the xylem and phloem?

Quote from: Skidous on October 18, 2016, 03:38:10 pm
Transverse
(Image removed from quote.)

Longitudinal
(Image removed from quote.)

Both
(Image removed from quote.)

An easy way to remember
Transverse is circular
Longitudinal is rectangular
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Blissfulmelodii

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Re: Biology Question Thread
« Reply #356 on: October 18, 2016, 04:52:00 pm »
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Quote from: kimmie on October 18, 2016, 04:49:11 pm
So which parts are the xylem and phloem?

The xylem is always the bit that is in the inside and the phloem is on the outside. Looking at a transverse cutting the xylem always makes an x shape in the centre.
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kevin217

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Re: Biology Question Thread
« Reply #357 on: October 18, 2016, 05:07:52 pm »
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Quote from: Blissfulmelodii on October 18, 2016, 04:40:32 pm
Yeah that's DNA hybidisation right?
So what is Comparative DNA sequencing? Isn't it the same thing?
Sorry I'm so confused right now
Oh I see what you mean, I've been taught DNA sequencing involves the comparison. In that case, I would think they're the same thing.
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Blissfulmelodii

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Re: Biology Question Thread
« Reply #358 on: October 18, 2016, 05:12:53 pm »
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Quote from: kevin217 on October 18, 2016, 05:07:52 pm
Oh I see what you mean, I've been taught DNA sequencing involves the comparison. In that case, I would think they're the same thing.

That's okay. Thanks  :)
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Skidous

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Re: Biology Question Thread
« Reply #359 on: October 18, 2016, 05:20:05 pm »
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Quote from: kevin217 on October 18, 2016, 05:07:52 pm
Oh I see what you mean, I've been taught DNA sequencing involves the comparison. In that case, I would think they're the same thing.
No they're different

Comparative DNA sequencing does not include the combination of DNA Strands, just looking at the differences in the sequencing themselves. So I just looks at the base pairs
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