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August 24, 2025, 09:54:21 am
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Author Topic: Biology Unit 4 Questions Megathread  (Read 60687 times)  Share 

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epinephrine

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Re: Biology Unit 4 Questions Megathread
« Reply #15 on: June 22, 2011, 09:22:01 pm »
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Bump! does anyone please have a pdfd copy of nelson biology? any help would be hugely appreciated  :D
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epinephrine

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Re: Biology Unit 4 Questions Megathread
« Reply #16 on: June 23, 2011, 10:27:07 pm »
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OMG dude I'm actually not allowed to :P 

Due to the vicissitudes of life I find myself in a rather unfavorable situation hence why I am posting on this thread. Now I hope that isn't too hard for you to comprehend and if you do happen to have a copy could you please pm me a link  :D
« Last Edit: June 23, 2011, 10:31:05 pm by epinephrine »
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Zebra

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Re: Biology Unit 4 Questions Megathread
« Reply #17 on: June 23, 2011, 11:36:49 pm »
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is it just me... mid yrs burnt all my motivation to work....
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Kaille

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Re: Biology Unit 4 Questions Megathread
« Reply #18 on: June 26, 2011, 12:39:52 pm »
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^ yes. the rest of my exams have been the epitome of mediocrity. yay for the burnouts.

anyway, just wanted to clear something up

one duplicated molecule of DNA winds into one duplicated chromosome. this chromosome is made of genetically identical sister chromatids held together by a centromere. right? my text book says that individual chromatids are chromosomes but the bound sister chromatids is known as a duplicated chromosome. i thought the sister chromatids made up the chromosome?? what what what ?
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scocliffe09

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Re: Biology Unit 4 Questions Megathread
« Reply #19 on: June 26, 2011, 02:39:21 pm »
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Quote from: Kaille on June 26, 2011, 12:39:52 pm
^ yes. the rest of my exams have been the epitome of mediocrity. yay for the burnouts.

anyway, just wanted to clear something up

one duplicated molecule of DNA winds into one duplicated chromosome. this chromosome is made of genetically identical sister chromatids held together by a centromere. right? my text book says that individual chromatids are chromosomes but the bound sister chromatids is known as a duplicated chromosome. i thought the sister chromatids made up the chromosome?? what what what ?
normally a chromosome only has one chromatid. Following replication, (S phase and beyond) each chromosome contains two identical/non-identical (depending on phase and mei/mitosis - think crossing over) sister chromatids...
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Christiano

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Re: Biology Unit 4 Questions Megathread
« Reply #20 on: June 29, 2011, 09:44:19 pm »
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Quote from: Zebra on June 23, 2011, 11:36:49 pm
is it just me... mid yrs burnt all my motivation to work....

I feel you.
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HERculina

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Re: Biology Unit 4 Questions Megathread
« Reply #21 on: July 06, 2011, 12:57:56 pm »
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is this right: one chromatid = one DNA molecule
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Massofbubbles

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Re: Biology Unit 4 Questions Megathread
« Reply #22 on: July 06, 2011, 08:04:48 pm »
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Yeah, one in each, as the chromatids form after replication.
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Inside Out

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Re: Biology Unit 4 Questions Megathread
« Reply #23 on: July 07, 2011, 01:04:27 pm »
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what is the correct definition for a genome. some say that its the total amount of genetic material/DNA in a cell and others say that it is the no. of genes in a cell. Which is it? Cause i know that not all DNA are genes.
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Russ

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Re: Biology Unit 4 Questions Megathread
« Reply #24 on: July 07, 2011, 01:31:58 pm »
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Total amount of genetic information in a cell (and is not necessarily just DNA and chromosomes)
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Inside Out

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Re: Biology Unit 4 Questions Megathread
« Reply #25 on: July 07, 2011, 01:35:02 pm »
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ohhhhhhhhhhhhhhh so its not just genes? then how come NOB says its jst genes.
Nxt question: What does the non-coding segments include.... does it include spacer DNA and promoter and stop regions as well as introns?
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Lesliel1

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Re: Biology Unit 4 Questions Megathread
« Reply #26 on: July 07, 2011, 01:40:27 pm »
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Is DNA synthesized in the 5'to 3' direction or the 3' to 5' direction? :P causes different sources are telling me different things
:S
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Russ

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Re: Biology Unit 4 Questions Megathread
« Reply #27 on: July 07, 2011, 01:50:22 pm »
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NOB is probably oversimplifying.
Non coding segments are basically anything that doesn't get translated into a functional protein product.
DNA is always synthesized 5' to 3', because the only place to add a new nucleotide is the 3' carbon of the ring (the 5' has the phosphate attached to it). The confusion almost always comes from the fact that a NEW DNA strand is always synthesized 5' to 3' but this means the COMPLEMENTARY strand is being read 3' to 5'
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Lesliel1

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Re: Biology Unit 4 Questions Megathread
« Reply #28 on: July 07, 2011, 01:54:03 pm »
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oo right  thanks =DD hehe
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HERculina

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Re: Biology Unit 4 Questions Megathread
« Reply #29 on: July 07, 2011, 01:58:34 pm »
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so wats spacer DNA. is it the same as/include introns?
and is genome a set no. for each organism or is it just a term to describe the total set of genetic material
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