Biology MCQ thread..!!

[lychee26]

explain please

the answer is C ?

 

[sweetiepie]

x=0.12-0.05 = 0.07s

i hope itx clear...

 

[Fauziya]

help i cant undrstnd this!!

 

[Fauziya]

:unknown: :Search:

 

[lychee26]

The answer is A.

 

[lychee26]

i'm talking about question 11.

 

[lychee26]

:unknown: :Search:

The answer is A.

 

[Fauziya]

:unknown: :Search:

The answer is A.

can u xplain me y is it so...

 

[lychee26]

For question 16 it is because the water potential outside the cell is less, hence osmosis takes place and water moves out of the cell. As a result the cell shrinks in size... SO it's A.

 

[lychee26]

For question 11:
Green means least amount of reducing sugar then Yellow then blue and lastly red. (according to the question)
So option A.

 

[sweetiepie]

HEY I ROTE DA SAME REASON FOR 16 ONE WOW....

 

[Romeo10]

No one answered these questions PLZ answer them i need them Thanxx
I want for the following questions plz. :
1- J10/11 23. What is the minimum no. Of base substitutions required to change the nucleotice sequence of the HbA allele to the HbS allele?
A. 1 B. 2 C. 3 D.4
why it is A??
2- J10/11 no. 8 why it is D ????
3- no. 27 in the same exam .....
4- N05/01 no. 37 why it is B ???
Plz i want explanations for the answers as i no the answers and i will be thankful!!
Sry for not posting pics of the questions here
thx in advance

 

[Fauziya]

ok.. so for J10/11 23.. ans. is A.. what i think is 3 bases code for a particular amino acid... and if one base changes(3rd position) it wont make much difference.. but it makes a difference..
hope u got what im trying to say..

 

[Romeo10]

Ok Thanxxx
But PLZ i need the rest of the Ques Xplained

 

[Talha]

Plz explain why ans is B and not A??

 

[Talha]

Explain plz!

 

[Talha]

Tel me how to calculate!! Ans is A..

 

[Talha]

Help plz!!

 

[Banglarbagh]

for no. 6.!! ANSWERED BY KANZ123

for the 6th question see..measure the length of the full diagram it is aproximate 6.3 cm nd in the question the length for the full diagram is 35 micrometres...
that means 6.3cm = 35 micrometres ....NOW measure the length of the mitochondrion i.e is approximate 1 cm
if 6.3 cm = 35 micrometres how many micrometres will equal 1cm....(cross multiplication) ....6.3cm into x = 1cm into 35...therefore X equals 5.5 micrometres...GOT IT ?
P.S im not sure of my measurements becoz i measured it on my laptop screen

or the 32nd question see...1st the oxygen molecues moves into and out of the cell alveolar wall(that makes it 2 times )...den into the capillary and out of the capillary wall( now dat makes it 4 times )..den atlast into the redblood cell through its cell surface membrane..dat makes it 5 ? got it ??

hey for the 22nd question..read the heamoglobin dissociation curve (s- shaped curve)..i guess u'll get it...i have an explanation but i aint sure

 

[Ahmad95]

Can anyone help me with these doubts? viewtopic.php?f=26&t=9440

Thank you.