communication option (1 Viewer)

[snickerdoodle]

Depolarisation must reach a threshold (minimum stimulus required to generate respnse in the nerve cell) which is at least 50 mV more than the resting potential of - 70 mv. No Action potential if depolarisation is below this level. Therefore not all stimuli produce an action potential.

Are you sure it's 50? My teacher said it's +15mV.

I basically wrote the same - threshold, resting stage, minimum stimulus of 15mV otherwise no action potention..etcetc.

I thought it was a pretty fair Communication section. I'm just mad I spent all week learning about Rhodopsin! Grr.

 

[Kirika]

oh thank god someone else put 15.. i was sitting here freaking out quietle, feeeling v. ashamed that i had managed to confuse a 15 and a 50... only ting... which the hell one is rite???

 

[snickerdoodle]

oh thank god someone else put 15.. i was sitting here freaking out quietle, feeeling v. ashamed that i had managed to confuse a 15 and a 50... only ting... which the hell one is rite???

According to my exercise book and notes, it's 15. But I don't know for sure because I handed in my Communication book! *is now nervous*

 

[falltopieces]

According to my exercise book and notes, it's 15. But I don't know for sure because I handed in my Communication book! *is now nervous*

I'm sorry but it's 15 mV more than the resting potential .

that was a typo

 

[Bokky]

Depolarisation must reach a threshold (minimum stimulus required to generate respnse in the nerve cell) which is at least 50 mV more than the resting potential of - 70 mv. No Action potential if depolarisation is below this level. Therefore not all stimuli produce an action potential.

Yeah i had a similar answer to that but yes i think u mean a stimulus of at least 15milliVolts from the resting potential of -70mV to create an action potential . That question ruled, i even managed to draw up a nice graph showing the action potential

 

[princess_jess]

well i hate the communication topic but was going ok until i got to part d! i didnt study action potentials and neurones so that sucked! the other questions were ok tho so hopefully i did well in them!

 

[falltopieces]

Yeah i had a similar answer to that but yes i think u mean a stimulus of at least 15milliVolts from the resting potential of -70mV to create an action potential . That question ruled, i even managed to draw up a nice graph showing the action potential

Yup do you have to draw the action-potential graph as well?

 

[Bokky]

well the question didnt ask u to but i decided to tho just to show the marker that i understand how the action potential works. So hopefully i can get some benefit from that.

 

[falltopieces]

well the question didnt ask u to but i decided to tho just to show the marker that i understand how the action potential works. So hopefully i can get some benefit from that.

Yeah I guess that's a good thing. Showing the marker that you know more.


which question was the hardest one?

 

[Bokky]

to me the hardest one was the "assess the use of micrographs for structure of neurones" . I didnt know exactly what to write about there so i guess i lost a bit of marks there.

 

[falltopieces]

to me the hardest one was the "assess the use of micrographs for structure of neurones" . I didnt know exactly what to write about there so i guess i lost a bit of marks there.

Yeah I guess I lost a few marks on that question too.

Hey how about the colour blindness question? .

 

[Bokky]

umm, i stated that Jack has a 50% chance of being colour blind if Maria (his mum) was a carrier of the colour blind condition. Coz i think Maria couldve been XCXc or XCXC (C being normal vision and c being recessive colour blind gene). And her husband, i forgot his name, is unaffected meaning that he is XCY. Did others say this as well?

 

[eemily]

umm, i stated that Jack has a 50% chance of being colour blind if Maria (his mum) was a carrier of the colour blind condition. Coz i think Maria couldve been XCXc or XCXC (C being normal vision and c being recessive colour blind gene). And her husband, i forgot his name, is unaffected meaning that he is XCY. Did others say this as well?

yep i pretty much got that, cos she's got 50% chance of being a carrier, depending on what she got from her mum.

that neurone question killed me.. what was the right answer? hopefully that's the only one i lost marks on though...

 

[falltopieces]

umm, i stated that Jack has a 50% chance of being colour blind if Maria (his mum) was a carrier of the colour blind condition. Coz i think Maria couldve been XCXc or XCXC (C being normal vision and c being recessive colour blind gene). And her husband, i forgot his name, is unaffected meaning that he is XCY. Did others say this as well?

Others mostly got 25%

 

[Bokky]

Others mostly got 25%

Oh yeah, thats because they counted every possible offspring including females, so 1 in 4 chance of being colour blind. But i think it's also correct to say 50% chance (or 1 in 2) only counting the males in the possible offspring. So yeah, i think u could be right either way

 

[falltopieces]

Oh yeah, thats because they counted every possible offspring including females, so 1 in 4 chance of being colour blind. But i think it's also correct to say 50% chance (or 1 in 2) only counting the males in the possible offspring. So yeah, i think u could be right either way

Yup. Looks like you're gonna get high 90s ^^

 

[Bokky]

lol i hope so, i mean the exam wasnt all that hard and i tried most questions my hardest. Id predict my mark to be around the low 80s, possibly high 80s, id be very happy with that. I wouldnt even mind high 70s either.

OMG stupid multiple choice question on smoking. i got that one wrong *CRIES!!!* i said viral disease, wat was i thinking. I thought viral meant like internal disease (as in lung disease), but the answer is environmental disease. argh i screwed that one up, ah well, time to move on.

 

[falltopieces]

lol i hope so, i mean the exam wasnt all that hard and i tried most questions my hardest. Id predict my mark to be around the low 80s, possibly high 80s, id be very happy with that. I wouldnt even mind high 70s either.

OMG stupid multiple choice question on smoking. i got that one wrong *CRIES!!!* i said viral disease, wat was i thinking. I thought viral meant like internal disease (as in lung disease), but the answer is environmental disease. argh i screwed that one up, ah well, time to move on

Hey how do you measure the size of the red blood cells and W.B.C in question 13?

 

[Bokky]

theres a prac/experiment u do in ur biology course to estimate the size of red blood cells. Red blood cells are approx. 7 micro-meteres not nm (nanometres).

 

[falltopieces]

theres a prac/experiment u do in ur biology course to estimate the size of red blood cells. Red blood cells are approx. 7 micro-meteres not nm (nanometres).

That means I lost 3 marks in the MC.

Dissapointing...