Bio - MCQ's Help Plz!!!

[Talha]

22 Which enzyme rejoins sections of DNA in genetic engineering?

A DNA ligase
B DNA polymerase
C restriction enzyme
D reverse transcriptase

Plz explain dis..

 

[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!! Y ans D and not B ?

 

[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

 

[kanz123]

for 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 ??

 

[kanz123]

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 ...

 

[kanz123]

for 22nd question the genetic engineering 1...is the answer C ?..restriction enzyme ?

 

[kanz123]

and i dont noe the 28th one ...wts the answer btw ?

 

[Xthegreat]

Help plz!! Y ans D and not B ?

alveolus is one cell thick. to pass through a cell, you have yo go through the cell surface membrane TWICE.
* think! right?! *

so alveolus -2
blood capillary - 2
then red blood cell -1