A level Biology: Post your doubts here!

[Kanekii]

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q37

D, histamine is produced by body cells not antibodies.

 

[A*****]

Sohaib now this is really for you lol
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A

 

[A*****]

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D maybe..plz tell me the correct answer for this

 

[A*****]

Q5 and What is general formula for AMYLOPECTIN AND STARCH.No cheating !

Won't they both have the same formula? (C6 H10 O5)n is this correct??

 

[A*****]

Q 25
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A

 

[Kanekii]

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D since pressure decreases from capillary to vein and veins have lower thickess than arteries but more than capillaries. Although i dont get the velocity one graph

 

[A*****]

Q36
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C

 

[A*****]

Q5
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A

 

[A*****]

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C

 

[A*****]

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q22

A ig

 

[A*****]

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Its D but someone plz explain the graph for cross sectional area

 

[A*****]

D since pressure decreases from capillary to vein and veins have lower thickess than arteries but more than capillaries. Although i dont get the velocity one graph

Velocity is minimum in capillaries for efficient exchange of substances...in the veins it is increased due to the action of skeletal muscles maybe

 

[A*****]

Correct me where I am wrong pleaseee

 

[Kanekii]

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q22

DNA has 2 strands so:
120÷2= 60
60÷3= 20 amino acids
'A'

 

[Kanekii]

Velocity is minimum in capillaries for efficient exchange of substances...in the veins it is increased due to the action of skeletal muscles maybe

Yes but what bugs me is shouldnt the difference in velocity between arteries and veins be greater? It seems to be so low

 

[A*****]

Yes but what bugs me is shouldnt the difference in velocity between arteries and veins be greater? It seems to be so low

Yes should have been but we don't have any other option

 

[SohaibButt]

Q32 B

 

[SohaibButt]

Q16 C

 

[SohaibButt]

Pls explain me

 

[angryrider_56]

Pls explain meView attachment 63877 View attachment 63878 View attachment 63879 View attachment 63877 View attachment 63878 View attachment 63879

is 11 C? And is 15 B? idk about 28 cuz i havent revised it yet.