Biology paper 11 gt

[Ahmed Shazly]

yes that was correct

For the antibodies through the mother, the answer is D, right? Passive natural

 

[malk mohamed]

what about the Q oF TUBERCULOSIS ( TB)

 

[Wolfgangs]

Guys if I got more than 30 in paper 11 and around 44-46 in paper 21, can I still get an a?

 

[Alex10]

Guys if I got more than 30 in paper 11 and around 44-46 in paper 21, can I still get an a?

Easily

 

[Wolfgangs]

One more thing, if you did paper 11. Do you remember the transpiration question which says which of the following processes is involved. Do you think mass flow of water through xylem tube is involved?

 

[GCE As and a level]

GUYS what was the answer for
1- Which process is the least affected by a change in the fluidity of the membrane ?
2-What is the MINIMUM number of membranes that are crossed by oxygen and carbon dioxide molecules ?
3-some thing about the hemoglobin protein structure ( I think that which of the protein structures of the hemoglobin are codded by DNA or some ting like this )

Smooth endothelium was correct i think the answer was 1,2&3

The Q3 question, the one about active transport, what was it again and what was the answer?

The option about the goblet cells secreting enzymes was the correct answer as they secrete mucus not enzymes
The layers that allowed the artery to resist changes in pressure were the elastic and muscle layer
D was the answer as anything with smooth endothelium was incorrect as its function is to minimize friction

what were the layers that control blood flow through an artery

B

ok, then which question are you talking about?

 

[Wolfgangs]

DNA question - Primary structure, it is mentioned somewhere in Genetic Control chapter

And for the process of least affected - I think endocytosis

 

[Hazooba]

DNA question - Primary structure, it is mentioned somewhere in Genetic Control chapter

And for the process of least affected - I think endocytosis

Osmosis, this is as water doesnt pass across the phospholipid bilayer but transport proteins. What was the answer concerning the factors that affect active transport ?

 

[GCE As and a level]

DNA question - Primary structure, it is mentioned somewhere in Genetic Control chapter

And for the process of least affected - I think endocytosis

Why not quaternary structure?
quaternary structure consist more than 1 polypeptide chains and the poly peptide chains are made from the transcription of DNA and then followed by translation !!!!

and about the least process i think as what he said

Osmosis, this is as water doesnt pass across the phospholipid bilayer but transport proteins. What was the answer concerning the factors that affect active transport ?

 

[Wolfgangs]

"DNA controls the protein structure by determining the exact sequence of the amino acids that join together when proteins are made" That is mentioned in my textbook

 

[Alex10]

Process least affected is diffusion, minimum number of membranes for carbon dioxide is 4 and oxygen 5

 

[Mohamed Shalaby]

guys for the transpiration question was the answer 1 and 4 ??

 

[Resigned_123]

For the transpiration question, all of the options besides evaporation of water from air spaces were correct. So mass flow in xylem is correct.
The least process affected was diffusion.
The structure coded for by DNA was the primary structure, the sequence of amino acids in the polypeptides of haemoglobin, as genes on the DNA strand code for the amino acids forming the polypeptide.
Thte minimum membranes were 4 and 5.

 

[Mohamed Shalaby]

For the transpiration question, all of the options besides evaporation of water from air spaces were correct. So mass flow in xylem is correct.
The least process affected was diffusion.
The structure coded for by DNA was the primary structure, the sequence of amino acids in the polypeptides of haemoglobin, as genes on the DNA strand code for the amino acids forming the polypeptide.
Thte minimum membranes were 4 and 5.

What about the artery question were all the 3 correct or endothelium is excluded

 

[Resigned_123]

Endothelium was excluded because it only helps in the flow of blood.. it doesn't help the artery in resisting high pressure... as in it doesn't prevent it from bursting

 

[Autumngirl]

Guys wasn't the least affected active transport because it depends solely on transport proteins? Endocytosis is obviously wrong because it has to do with flowing of the membrane. Since osmosis and diffusion occur through the phospholipid bilayer I would assume that fluidity of the membrane affects them. Also I recall there was a question in some paper 2 from the past papers in which diffusion increased a s temperature increased due to more fluidity according to the mark scheme.

 

[Autumngirl]

What about the question on TB? Do the bacteria live in cells or outside them?

 

[Mohamed Shalaby]

Guys wasn't the least affected active transport because it depends solely on transport proteins? Endocytosis is obviously wrong because it has to do with flowing of the membrane. Since osmosis and diffusion occur through the phospholipid bilayer I would assume that fluidity of the membrane affects them. Also I recall there was a question in some paper 2 from the past papers in which diffusion increased a s temperature increased due to more fluidity according to the mark scheme.

I put active transport too , also Osmosis is a kind of diffusion so obliviously both are excluded

 

[Mohamed Shalaby]

What about the question on TB? Do the bacteria live in cells or outside them?

All the three were correct

 

[Autumngirl]

I put active transport too , also Osmosis is a kind of diffusion so obliviously both are excluded

Exactly, osmosis is essentially just diffusion of water.