Biochem

[Rathi]

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Pls explain these

A urine sample with a pH of 5.7 has a H+ concentration of approx
2*10^-3M
2*10^-5M
1*10^-5M

one strand of DNA has 20% A, 30%T and 40% C. what is the percentage of C on the other strand
10
20
50
80
90

 

[njsmahal]

2*10^5 moles
and second should be 60 but the closest is 50 i think

 

[njsmahal]

ooops its 10 percent

 

[Rathi]

ooops its 10 percent

Could you please explain

 

[Rathi]

Some 1 pls explain this concept

A + G= T+C
20+ ? = 30+40

 

[njsmahal]

first strand has 20% A, 30%T and 40% C so G would be 100-A-T-C = 100-20-30-40 = 100-90 = 10
so on first strand we have G as 10 % and now complementary strand would have C coupled with G so if G is 10 % C which couples with it would be 10 % as well.

 

[njsmahal]

A + G= T+C
20+ ? = 30+40

actually its also A=T and G=C in complementary strands
and these are percentages given and A+G of one strand would be equal to T+C of the other not the same strand

 

[econservative]

Pls explain these

A urine sample with a pH of 5.7 has a H+ concentration of approx
2*10^-3M
2*10^-5M- ans
1*10^-5M

one strand of DNA has 20% A, 30%T and 40% C. what is the percentage of C on the other strand
10
20
50
80
90

---????????????????????

please edit your question as the value for C is already given in the question only ..????????????
SO WHICH VALUE R YOU ASKING

 

[de297]

2*10^5 moles
and second should be 60 but the closest is 50 i think

shouldnt the first answer be 1* 10^5 moles as ph is the log of H+

 

[njsmahal]

shouldnt the first answer be 1* 10^5 moles as ph is the log of H+

i am just guessing log 7 to be nearly 2