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thnx! (Im a chelsea fan too! )i hope this diagram helps...there's alot of irrelevant data on it but just look at the stuff thats on our syllabus
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thnx! (Im a chelsea fan too! )i hope this diagram helps...there's alot of irrelevant data on it but just look at the stuff thats on our syllabus
I think he referring to the third(excluding the already printed answer). If not then you are right.i dont think so, J is the nucleolus, this is where the ribosomes are manufactured. while transcription is the formation of the mRNA molecule..this takes place in the nucleoplasm (nucleus) >> H.
Nitrogen fixation: This is the process which converts gaseous nitrogen by the help of enzymes nitrogenase, into forms such as amonia, which can be used by plants.-In an antibody, does the sugar chain attached influence the specificity of the antibody?
-What are the exact definitions for *nitrification* and *nitrogen fixation*?
Please help
for question bhttp://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Biology (9700)/9700_w09_qp_22.pdf
then could you explain to me how to answer Q1 - b? and C too please
as for chttp://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Biology (9700)/9700_w09_qp_22.pdf
then could you explain to me how to answer Q1 - b? and C too please
they have nitrogen fixing bacteria in their nodules called Rhizobium which convert the nitrogen into NH4+ for the plants to use They do this under anaerobic conditions so the plant regulates a protein called legahaemoglobin in the root nodules where the bacteria live , coz this protein efficiently mops up any oygen that enters the root noduleshow do leguminous plants survive in nitrogen deficient soils?
thanksthey have nitrogen fixing bacteria in their nodules called Rhizobium which convert the nitrogen into NH4+ for the plants to use They do this under anaerobic conditions so the plant regulates a protein called legahaemoglobin in the root nodules where the bacteria live , coz this protein efficiently mops up any oygen that enters the root nodules
carbamino haemoglobin is formed when co2 combines with Hb.carboxyhaemoglobin forms when carbon monoxide combines with haemoglobinwhen is carbamino-haemoglobin formed and when is carboxy-haemoglobin formed??? please help urgently....tx
when co2 combine directly with the -NH2 group (amine group) without that reaction that involve carbonic anhydrase enzyme >>> carbo amino haemoglobin is formedwhen is carbamino-haemoglobin formed and when is carboxy-haemoglobin formed??? please help urgently....tx
when is carbamino-haemoglobin formed and when is carboxy-haemoglobin formed??? please help urgently....tx
Urgent.
What's the function of the enzyme helicase and the enzyme DNA Polymerase.
yeah i saw tha earlier and wanted to come ask aswell..but when you come to look at it..there's a "/" between the two answers so maybe that meant it was another idea and wasn't referring to the CO2 and Hb combining?Thanx people bt the pro is check out mj/11 p21 the ms says that CO2 combines with Hb and carboxyhaemoglobin is formed! Please check it out and explain...thanx soo much and God bless you all!
lol Long live the Blues..goodluck with your exams tomorrow brothnx! (Im a chelsea fan too! )
Nah I don't think it's another idea....I feel there's a point I am missing there....maybe something to do with the part of Haemoglobin the CO2 combines with......people please help out....tx a lot!yeah i saw tha earlier and wanted to come ask aswell..but when you come to look at it..there's a "/" between the two answers so maybe that meant it was another idea and wasn't referring to the CO2 and Hb combining?
Thanks.
Can someone please tell me an outline of the sequence in an Immune Response.
Primary response
1) the pathogen invades the body
2) it damages or weakens body cells
3) the weakened body cells produce proteins called histamines
4) the phagocytes in the blood are attracted to these proteins...(chemotaxis)
5) the phagocytes (macrophages) engulf the pathogen by phagocytosis and display the non self antigens on its surface
6) the T helper cells with the complementary receptors goes and recognizes the antigens of the pathogen, and secretes chemicals which cause the bone marrow to form T Killer cells, and secretes cytokines (hormone-like)
7) B lymphocytes with the complementary surface receptors are activated due to these cytokines and divide by mitosis to produce B-memory cells and Plasma cells.
8) The B memory cells further divide to produce more memory cells and plasma cells.
9) the plasma cells release anitbodies with the variable region (antigen binding site) complementary to the antigens of the pathogen. These antibodies destroy the pathogens.
10) The T killer cells (cytotoxic T cells) with the specific complementary receptors release chemicals such as hydrogen peroxide or punch holes in the infected body cells to remove and kill any remaining weakened body cells, and the remaining debris.
11) The memory B and memory T cells remain circulating in the blood.
Secondary response:
The memory cells which are in the blood on the encounter of the pathogen with the antigens complementary to their receptors, divide rapidly producing plasma cells which secrete antibodies (more than the primary response) and the pathogens are destroyed in a short time.
Correct me if im wrong
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