2020 Biology Exam

[Cupcake2423]

yeah i agree but a pandemic = many populations. the person introduced the virus from another population (who went on aeroplane) to the isolated population. but i still might be wrong though

I think with a pandemic, it is "an outbreak of an infectious disease that infects more the usual amount of people, crossing multiple country borders (usually around the world". However with this question it was described a specific population (and sometimes even if it is across countries, it may not be a pandemic for example if it's close surrounding countries (got that from a past VCAA exam)) (so damn sorry if im wrong)

[fwift52]

but if u read the article it said australia already had measles vaccine 1 year before it was introduced to papau new guinea  thats why i thought it was pandemic. sorry i know i might be wrong

What? The article referenced both the countries vaccination percentage in 2018 which would cause the high infection rate in 2019 when the event occurred. Also there are articles about it being an epidemic.

"Measles epidemic in Samoa and other Pacific islands"
https://www.thelancet.com/journals/laninf/article/PIIS1473-3099(20)30053-0/fulltext

[Jinju-san]

but if u read the article it said australia already had measles vaccine 1 year before it was introduced to papau new guinea  thats why i thought it was pandemic. sorry i know i might be wrong

Hey there.
I get where your logic was behind your answer for this question. But I think its important to remember that, like you mentioned, Australia had actually implemented large scale vaccination programs a year before the Samoan outbreak. This would mean that Australia had developed herd immunity, so even if one person was to get infected with Measles, they wouldn’t be able to spread it amongst those around them for an outbreak/ epidemic to occur. So I think the infected person that travelled to Samoa would have caused an epidemic.
I do understand where you are coming from though.

[failingenglish]

a pandemic is a epidemic that has spread globally. the person on the flight came from a population already with the disease which was spread to somoa. therefore, i think it is a pandemic

look at the article above. seems legit but idk

[failingenglish]

Hey guys,
im still really confused about the NAD and the ATP question from the multiple-choice? Why was one of them wrong

[Cupcake2423]

Hey guys,
im still really confused about the NAD and the ATP question from the multiple-choice? Why was one of them wrong

which question was it?

[valjaybj]

a pandemic is a epidemic that has spread globally. the person on the flight came from a population already with the disease which was spread to somoa. therefore, i think it is a pandemic

yeaaa i get where you're coming from...i guess it depends on whether vcaa wanted us to dig that deep into the article or just recognise the fact that it was an outbreak in smaller population (in samoa) so it's an epidemic cos it didn't spread to other continents (which would be considered a pandemic), i think you should get the mark for your justification though!

[failingenglish]

which question was it?

It was a multiple-choice showing the respiration biochemical pathway. Options C and D were like "2 molecules of ATP are created to be used for cellular processes" and D was "NAD is loaded with electrons to carry to the electron transport chain" it was something like that i cant remmeber what the actual question was, but they both seemed correct??

[ActivationEnergy]

It was a multiple-choice showing the respiration biochemical pathway. Options C and D were like "2 molecules of ATP are created to be used for cellular processes" and D was "NAD is loaded with electrons to carry to the electron transport chain" it was something like that i cant remmeber what the actual question was, but they both seemed correct??

The correct one is NADH carrying electrons to the electron transport chain. The other one is incorrect because in the diagram, glycolysis had already occurred (because of the production of pyruvate). Thus, this suggests that ATP had already been produced. This was just my interpretation!

[Cupcake2423]

It was a multiple-choice showing the respiration biochemical pathway. Options C and D were like "2 molecules of ATP are created to be used for cellular processes" and D was "NAD is loaded with electrons to carry to the electron transport chain" it was something like that i cant remmeber what the actual question was, but they both seemed correct??

Ohhhhh yepyep
so for pathway one, it was showing anerobic respiration pathway AFTER glycosis (and this where the 2ATP are made, not in the actual part labelled pathway 1 which is where either lactic acid or alcohol & CO2 would be made)

[valjaybj]

Ohhhhh yepyep
so for pathway one, it was showing anerobic respiration pathway AFTER glycosis (and this where the 2ATP are made, not in the actual part labelled pathway 1 which is where either lactic acid or alcohol & CO2 would be made)

yep exactly!!! (from what i think)

[valjaybj]

ahhh i wonder what they wanted us to say for the 5 mark gel electrophoresis question...i've never come across a question like that before so i was stumped :/

[Isaac S]

What mark do you guys think is needed out of 120 for an A+ this year?

[Cupcake2423]

ahhh i wonder what they wanted us to say for the 5 mark gel electrophoresis question...i've never come across a question like that before so i was stumped :/

yessss omggg, i was like bro you've never asked of this before smh
I basically just said that like
test tube 1 with BamHI: how many restrictions sites according to the number of bands and the size of these fragments
Test tube 2: Along the same lines
Test tube 3: corresponds with the other results b/c .... BUT I HAVE NO IDEA WHAT THEY WANTED FOR 5 MARKS GEEZ?!

[valjaybj]

yessss omggg, i was like bro you've never asked of this before smh
I basically just said that like
test tube 1 with BamHI: how many restrictions sites according to the number of bands and the size of these fragments
Test tube 2: Along the same lines
Test tube 3: corresponds with the other results b/c .... BUT I HAVE NO IDEA WHAT THEY WANTED FOR 5 MARKS GEEZ?!

SAMEEEEE i said the same stuff like number of restriction sites and size of the fragments but yeah wth were the 5 marks for lmaoooo