Biology Exam Discussion (and suggested answers!)

[Rainbowhippocampus]

With the genotype question that was a multiple choice from 2001 and the answer was ABG, abG, ABg, and abg so why is the answer different this time?

I did the same thing, confused as to why it's different as well. 

[Paul.I]

With the genotype question that was a multiple choice from 2001 and the answer was ABG, abG, ABg, and abg so why is the answer different this time?

I honestly can't believe it, if that is the right answer l am going to be so happy. Obviously, they asked for before the crossing over occurs so l would assume, ABG ABG, abg and abg as the answers

[angelahchan]

I honestly can't believe it, if that is the right answer l am going to be so happy. Obviously, they asked for before the crossing over occurs so l would assume, ABG ABG, abg and abg as the answers

do you reckon ABG, abg would be fine as well if the answer follows the same as 2001? since the chromosomes duplicate for meiosis but original genotype would be halved

[narmeen.sherif]

Shouldn't 9 be 5ml of starch and 1 ml of water for control so that the volume is kept the same?

[Chrispy365]

I honestly can't believe it, if that is the right answer l am going to be so happy. Obviously, they asked for before the crossing over occurs so l would assume, ABG ABG, abg and abg as the answers

Yeah looking at this https://gyazo.com/e61a5586c44f62f92b9296400b20d9f6 it should be right you'd think?

[ca052267]

Beadle and Tatum...  last Q for Communication was pretty tough as well.

I feel ya

[Rathin]

For the genotype I wrote Aa and not all the possibilities as it was only one mark. Will I get 0?

[Paul.I]

Shouldn't 9 be 5ml of starch and 1 ml of water for control so that the volume is kept the same?

No, now you are not controlling the variables. If using water and starch as the control then for the experiment you would need to have water, starch and amalayse. But because it is only asking for amalayse and starch. And seeing as there was no option for water amalayse and starch then the only possible answer is just starch for the control and amalayse and starch for the experiment

[Paul.I]

Yeah looking at this https://gyazo.com/e61a5586c44f62f92b9296400b20d9f6 it should be right you'd think?

One would hope, l guess we will only know when the NESA answers come out

[Tino_BCP]

Exam was way too easy in my opinion. I'm not sure exactly how NESA is going to be able to differentiate people as easily.

[adelaidecruz]

How did people find communication? Any suggested answers?

Hey I personally found it quite ‘forgiving’ compared to previous years although I got confused on the rhodopsin and rods question.. for part (i) I just said that rhodopsin breaks down to retinal and opsin , and for part (ii) in comparing rods and cones, I didn’t think that the rods’ peripheral acuity & ability to distinguish between light & dark shades was enough for a 4-5 marker so I repeated what I said about rhodosopin. Hopefully won’t lose marks for writing too much haha. How’d you find it?

Moderator edit: updated username in quote as per request —Calebark

[aocampo]

If possible can someone please post a copy of the exam, or at least the multiple choice section? I can't remember all the options for each question haha so I don't know what I chose

[Jlizzle]

How did people find communication? Any suggested answers?

- Rhodopsin are in rods right? LOL
- The lens changes curvature when focusing on a near object as the ciliary body muscles contract, and the suspensory ligaments are no longer taught, thus creating a thicker and rounder lens. When the eye is focusing on an image in the distance, the ciliary body muscles are relaxed and taught, and the lens is now flat and thin.
- For the threshold potential question, signal 1 couldnt result in a transmission of stimulation as it did not generate the threshold action potential greater than -70mV. For part 2, I talked about depolarisation, repolarisation, hyperpolarisation and the resting membrane potential and drew the chemical membrane cause why not!
- For the last 7 marker question I defined what soundwaves were, explained how we hear through the different structures and their function (as well as their energy change and how it is transmitted to the auditory cortex/temporal lobe), then reiterated that from our understanding of the human ear, if one structure was not functioning properly, our hearing would be compromised. Then insert cochlear implant and the hearing aid (function, where it’s worn, energy changes and the type of people to use these devices) and concluded it! I’m not sure if I properly answered the question, but I just regurgitated anything about the ear and the development of technology to assist people with hearing loss.
How was it for you?

Moderator edit: updated username in quote as per request —Calebark

[taylorlucy]

If possible can someone please post a copy of the exam, or at least the multiple choice section? I can't remember all the options for each question haha so I don't know what I chose

No one has a copy of the exam yet but NESA has been quite quick in uploading them this year so it should be up on their website in a couple of days

[Opengangs]

If possible can someone please post a copy of the exam, or at least the multiple choice section? I can't remember all the options for each question haha so I don't know what I chose

Q1 was about which process maintains an internal stable environment?
Q2 was about which system could detect and counteract changes in the external environment?
Q3 was about which scientist gave a better understanding (can't remember exact wording) about the immune response?
Q4 was about the role of the lymphocytes.
Q5 had an image and made us pick which evolutionary evidence was applied
Q6 was about which process engulfs the antigen.
Q7 was about the waste product of renal dialysis
Q8 was about how carbon dioxide changes the pH and acidity
Q9 had a fair experiment, and made us pick the controlled and experiment.
Q10 had a picture of a cell with a scale; it made us work out the exact measurement of the cell.
Q11 had a table about B and T lymphocytes, and we had to conclude which was correct based on the information we know.
Q12 was about the percentage of tall offsprings based on the genotypes of the parents.
Q13 had a sequence of amino acids. After DNA replication, what is the sequence of amino acids on the "newly made strand" of DNA?
Q14 we had to distinguish which row was correct between protozoans and fungi.
Q16 had a table (diffusion, osmosis, active transport, or passive transport)
Q17 was about the discoveries of the DNA made after Rosalind Franklin's work?
Q19 had a 44 chromosome zebronkey and a 62 chromosome other animal, and we had to work out the number of chromosomes in the offspring
Q20 had a trend after every 10 minutes, what could we conclude from the graph?

These are from my memory, not sure if I'm supposed to post it