A level Biology: Post your doubts here!

[♣♠ Magnanimous ♣♠]

Thank you so much

No probs

 

[Shada Mohammed]

A question I got from a book
it says there are 20 different aminoacids which cells use to make proteins.
How many different aminoacids could the triplet code for?
(Remember there are four possible bases)

 

[♣♠ Magnanimous ♣♠]

A question I got from a book
it says there are 20 different aminoacids which cells use to make proteins.
How many different aminoacids could the triplet code for?
(Remember there are four possible bases)

You talking about those base pairs i.e. A T G C right?

 

[Shada Mohammed]

You talking about those base pairs i.e. A T G C right?

Yes I thinks it says how many possible triplet bases we could have from these bases? Each triplet bases equal to one aminoacid so the number of different triplet
bases will equal to number of aminoacids

 

[♣♠ Magnanimous ♣♠]

Yes I thinks it says how many possible triplet bases we could have from these bases? Each triplet bases equal to one aminoacid so the number of different triplet
bases will equal to number of aminoacids

I am not getting
can you give me screenshot plz!

A T G C these are base pairs.
DNA is helical in structure and it formed from 1) Ribose sugar 2)Phosphate group 3) Base pair ( A T G C) .Overall you can say the strand is made up of Nucleotide.

The DNA strands are antiparallel.
There are 10 base pairs one helical turn. (Here the base pairs are bonded to one another i.e A=T and G triple bond to C)
The distance between two base pairs is 3.4 Augustan.
Diameter is 20 Augustan.
Distance between 10 base pairs is 34 Augustan.

 

[Shada Mohammed]

I am not getting
can you give me screenshot plz!

A T G C these are base pairs.
DNA is helical in structure and it formed from 1) Ribose sugar 2)Phosphate group 3) Base pair ( A T G C) .Overall you can say the strand is made up of Nucleotide.

The DNA strands are antiparallel.
There are 10 base pairs one helical turn. (Here the base pairs are bonded to one another i.e A=T and G triple bond to C)
The distance between two base pairs is 3.4 Augustan.
Diameter is 20 Augustan.
Distance between 10 base pairs is 34 Augustan.
View attachment 48519

No it has nothing to do with diameter you must work out the number of aminoacids you can get from a number of triplet bases
as each triplet base codes for one aminoacid

 

[Shada Mohammed]

I need a good answer please

Describe the way in which the nucleotide sequence codes for the aminoacid sequence in the polypeptide

 

[ABC12348]

http://papers.xtremepapers.com/CIE/...and AS Level/Biology (9700)/9700_w06_qp_4.pdf
can anybody please explain Q2 (a) from paper4 oct/nov 2006. How do you determine that alleles for a phenotype are whether homozygous or heterozygous by reading the given data in question? for example hair color of a dog. Please check out the question mentioned above.

 

[♣♠ Magnanimous ♣♠]

I need a good answer please

Describe the way in which the nucleotide sequence codes for the aminoacid sequence in the polypeptide

Well this might help you.
http://virtuallaboratory.colorado.e...reNotes-Revision/Topic3-6_Making Proteins.htm
Hope so.

 

[Marry]

Does anyone know how to make a table for serial dilution?

 

[hussain777]

Hi everyone, assalamoalaikum!!

To get things organized in a better way, I am making this thread. As othewise, some queries remain unanswered!

So post your A LEVEL BIOLOGY doubts in this thread. InshaAllah those who can , will help me and you all.

Will try to update this soon, by adding links to some Biology Notes & Links around the forum.

Thanks!
Jazak Allah Khair!

BIOLOGY LINKS & NOTES :


B!0l0gy $l!de$ & N0te$... - by workinghard

Biology Practical notes!! - by libra94

http://www.biologymad.com

http://www.biologyinnovation.co.uk

Action Potential - Notes

Get great Olevel, Igcse Gcse notes, resouces, books, topical past papers at www.gcebuddy.wordpress.com ,

 

[Nasrullah Ali Baloch]

Can anyone please provide me the best notes of AS-Level Biology????

 

[♣♠ Magnanimous ♣♠]

Can anyone please provide me the best notes of AS-Level Biology????

http://www.biology-innovation.co.uk/

 

[♣♠ Magnanimous ♣♠]

Can anyone please provide me the best notes of AS-Level Biology????

http://www.biologymad.com/

 

[♣♠ Magnanimous ♣♠]

Can anyone please provide me the best notes of AS-Level Biology????

http://www.biologyguide.net/

 

[♣♠ Magnanimous ♣♠]

Can anyone please provide me the best notes of AS-Level Biology????

http://studyguide.pk/?page_id=239

 

[♣♠ Magnanimous ♣♠]

Can anyone please provide me the best notes of AS-Level Biology????

Not sure ---> http://www.revisiontime.com/aBio.htm

 

[Lola_sweet]

In paper 3 when we have to plot a graph is it a must the x-axis starts with 0 like igcse bcuz this markscheme shows the axis starting with 5

http://papers.xtremepapers.com/CIE/...nd AS Level/Biology (9700)/9700_w08_ms_31.pdf

Qs 1)b)ii)

Also hw is the mean in Qs 1)b)i) 85
my answer is 77

Qs paper:
http://papers.xtremepapers.com/CIE/...nd AS Level/Biology (9700)/9700_w08_qp_31.pdf

 

[Saad Amjad.]

http://papers.xtremepapers.com/CIE/...nd AS Level/Biology (9700)/9700_w12_qp_42.pdf can someone please help me with 4(b)..its labeling of the seminiferous tubule.

 

[♣♠ Magnanimous ♣♠]

In paper 3 when we have to plot a graph is it a must the x-axis starts with 0 like igcse bcuz this markscheme shows the axis starting with 5

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Biology (9700)/9700_w08_ms_31.pdf

Qs 1)b)ii)

Also hw is the mean in Qs 1)b)i) 85
my answer is 77

Qs paper:
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Biology (9700)/9700_w08_qp_31.pdf

Well it can start with 5 but there should Z on x axis. Remember in Maths of IGCSE!
And yeah that 85 is wrong answer in mark scheme.
It is 77.2
Sometimes there are mistakes in the markschemes.