hey guyz ! unit 3 bio discussion , doubts in here !!

[DANGERBP]

no i dont think u do :/

kool ! =p =p

 

[U stalking ME]

Obv I aint relyin on that I hve Gone throu evrythin
Btw do you noe what to write if they ask to comment on the validity of the result ?

for commenting on validity consider; hypothesis, variables, controlled factors, size of the sample, apparatus, the control, and the measuring instruments.

 

[étudiante]

for commenting on validity consider; hypothesis, variables, controlled factors, size of the sample, apparatus, the control, and the measuring instruments.

hypothesis? wat do we need to say abt the hypothesis?

 

[U stalking ME]

hypothesis? wat do we need to say abt the hypothesis?

like does ur experiment prove the hypothesis or not.

 

[étudiante]

like does ur experiment prove the hypothesis or not.

oh okay! i dint understand u meant dat thanks

 

[Arabella_18]

Thankyou So much 7abibti Can you please Kinda Explain Further

 

[Arabella_18]

ummm hey wat bout the totipotency experiment do we need to know anythin regardin strilizing using
(chlorate (I) solution Bleach)

http://www.scribd.com/doc/48506933/AS-Edexcel-Biology-Core-Practical-Summary
this might help you ! Summary of all the experiments

 

[DANGERBP]

http://www.scribd.com/doc/48506933/AS-Edexcel-Biology-Core-Practical-Summary
this might help you ! Summary of all the experiments

thnk yoooou !

 

[DANGERBP]

guyz wake up !!! need your help !











>What is
recombinant DNA?


The plasmids act as vectors for the resistance gene. What is a
vector?

Suggest how cells with the resistance gene might be selected.

Suggest which tissue would be most suitable for the explants.
Explain why explants containing large quantities of xylem do not usually grow into a callus.
State what is meant by the term totipotency.
Distinguish between differentiation and dedifferentiation. ?????
Suggest why adult animal cells usually do not develop into complete organisms, but plant tissues do.?

 

[DANGERBP]

guyz nd why do we cover the plant when were testin for meniral diffecient ?? and why do we apply air in ?

 

[DANGERBP]

guyz common !!! enough sleepin already !!!! =p

 

[U stalking ME]

guyz nd why do we cover the plant when were testin for meniral diffecient ?? and why do we apply air in ?

to prevent algal growth and to provide aerobic conditions as anaerobic conditions results in the growth of anaerobic bacteria.

 

[DANGERBP]

to prevent algal growth and to provide aerobic conditions as anaerobic conditions results in the growth of anaerobic bacteria.

oh thank you !
man i read tht more thn billion times nd still i ask bout them .. my minds crap -.-'

 

[DANGERBP]

to prevent algal growth and to provide aerobic conditions as anaerobic conditions results in the growth of anaerobic bacteria.

nd hey can you tell me the validity of the mitosis experiment ?

 

[U stalking ME]

guyz wake up !!! need your help !











>What is
recombinant DNA?


The plasmids act as vectors for the resistance gene. What is a
vector?

Suggest how cells with the resistance gene might be selected.

Suggest which tissue would be most suitable for the explants.
Explain why explants containing large quantities of xylem do not usually grow into a callus.
State what is meant by the term totipotency.
Distinguish between differentiation and dedifferentiation. ?????
Suggest why adult animal cells usually do not develop into complete organisms, but plant tissues do.?

cell determination is the point in the cell's life when the primitive cell is committed to becoming a particular specialized cell. At this point the cell still looks primitive. Afterwards, cell differentiation starts turning the cell into its final specialized state
cell de-differentiation is the process that occurs when a specialized cell turns back to a primary state. this occurs for example when you try to clone a plant from a single specialized plant cell

 

[U stalking ME]

nd hey can you tell me the validity of the mitosis experiment ?

validity

To get more accurate readings, the root tips must be macerated well to break down the cellso it will be only one cell thick. Alternatively, another microscope slide can be placed at rightangles to the original slide to form a cross, and squash the tip between the two slides. Thismethod will provide two samples for staining and allow the root tip to be only one cell- thick.Lateral movement of the cover slip must be prevented to avoid overlapping. Besides that,validity can be ensured by carefully using an eyepiece graticule which has been calibratedcorrectly using a stage micrometer. For more accurate reading somehow, graticule scale withsmallest divisions can be used.
Reliability
The experiment is unreliable as we only study the mitotic process of apical meristem cells by preparing 1 slide. We should prepare more similar slides. Then, we compare the results so thatwe can get a more reliable result.This experimental result is valid. The procedure is designed well to study the mitotic process of apical meristem cells. Besides, the length of cells during interphase and cytokinesis is measuredusing appropriate devices, which are stage micrometer and eyepiece. The method used is easy to be carried out. We stain the chromosomes with toluidine blue and then we observe the resultunder a microscope.

 

[DANGERBP]

cell determination is the point in the cell's life when the primitive cell is committed to becoming a particular specialized cell. At this point the cell still looks primitive. Afterwards, cell differentiation starts turning the cell into its final specialized state
cell de-differentiation is the process that occurs when a specialized cell turns back to a primary state. this occurs for example when you try to clone a plant from a single specialized plant cell

oh thank you so much ! =) seriously thx =p !

 

[DANGERBP]

validity

To get more accurate readings, the root tips must be macerated well to break down the cellso it will be only one cell thick. Alternatively, another microscope slide can be placed at rightangles to the original slide to form a cross, and squash the tip between the two slides. Thismethod will provide two samples for staining and allow the root tip to be only one cell- thick.Lateral movement of the cover slip must be prevented to avoid overlapping. Besides that,validity can be ensured by carefully using an eyepiece graticule which has been calibratedcorrectly using a stage micrometer. For more accurate reading somehow, graticule scale withsmallest divisions can be used.
Reliability
The experiment is unreliable as we only study the mitotic process of apical meristem cells by preparing 1 slide. We should prepare more similar slides. Then, we compare the results so thatwe can get a more reliable result.This experimental result is valid. The procedure is designed well to study the mitotic process of apical meristem cells. Besides, the length of cells during interphase and cytokinesis is measuredusing appropriate devices, which are stage micrometer and eyepiece. The method used is easy to be carried out. We stain the chromosomes with toluidine blue and then we observe the resultunder a microscope.

many thanks to you ! =) =)
would you happen to have the same thing for totiponcy ? =$ =$

thankss !

 

[U stalking ME]

many thanks to you ! =) =)
would you happen to have the same thing for totiponcy ? =$ =$

thankss !

i dont have it for totipotency
sorry

 

[DANGERBP]

i dont have it for totipotency
sorry

oh don worry ~! thank you again ! =)