Biology Exam Discussion (and suggested answers!)

[adelaidecruz]

- 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?

Hi for the 7 marker did you talk about the microphone and amplifier and basically all the individual parts in cochlear implant and hearing aid?

[Jlizzle]

Hi for the 7 marker did you talk about the microphone and amplifier and basically all the individual parts in cochlear implant and hearing aid?

I mainly talked about it with the hearing aid. With the cochlear implant I talked a bit about it but I was mainly talking about the organ of corti and the hair cells

[pikachu975]

- 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?

Should be taught not taught


BTW to the person asking if you can lose marks for writing too much, no you can't unless you wrote wrong content. You can only lose marks for writing too little.

[aocampo]

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

Thank you! Also with the 2 mark question about drawing a diagram of xylem and phloem, is it 1 mark for drawing it, and another for correctly labelling it?

[Opengangs]

Thank you! Also with the 2 mark question about drawing a diagram of xylem and phloem, is it 1 mark for drawing it, and another for correctly labelling it?

I would've thought a mark for the transverse of each.
So, one mark for transverse section of a xylem and one mark for transverse of phloem.

[pikachu975]

I would've thought a mark for the transverse of each.
So, one mark for transverse section of a xylem and one mark for transverse of phloem.

Both are just circles so I doubt they'd give a mark for each

[Eleanore8]

Hi I was just wondering how Q15 of MC is codominace?

[Randomname1]

Ok so i completely messed up for the artery and vein question and put them the wrong way around. Is there any hope at getting at least one or two marks or did i just lose the easiest 5 marks of my life?? 

[pikachu975]

Hi I was just wondering how Q15 of MC is codominace?

Write genotypes as AA and BB then offspring is all AB hence codominance

If it wasn't then say AA and aa so all offspring are same phenotype as the parent AA hence it is wrong

[DalvinT]

They’ve recycled the question lol.
 I wrote
Before - ABG, ABG, abg , abg
After - ABG, abG, ABg, abg

[Merin Thomas]

Hey for the question with the substrate (question 20 in multiple choice), how can it be A or D? cause basically isnt that the same thing? decreasing the concentration of the substrate decreases the rate of reaction? Also, for the question with the image of the chromosomes and crossing over, I only wrote one of the possible 4. Reckon theyll take the mark away? What do u reckon will be band 6 o.o   

[DalvinT]

Definitely felt like Q19 was testing your knowledge on whether you could apply what Mendel, Sutton and Boveri discovered!

[DalvinT]

Hey for the question with the substrate (question 20 in multiple choice), how can it be A or D? cause basically isnt that the same thing? decreasing the concentration of the substrate decreases the rate of reaction? Also, for the question with the image of the chromosomes and crossing over, I only wrote one of the possible 4. Reckon theyll take the mark away? What do u reckon will be band 6 o.o   

Mm maybeee?? Cause it was plural, “genotypeS”

Maybe around like 95+? Considering it was fair and most likely, the state must’ve done well too

[Zamura1]

Mm maybeee?? Cause it was plural, “genotypeS”

Maybe around like 95+? Considering it was fair and most likely, the state must’ve done well too

Lol 95 for a band 6?, its gonna be more like a 83-84

[DalvinT]

Hey for the question with the substrate (question 20 in multiple choice), how can it be A or D? cause basically isnt that the same thing? decreasing the concentration of the substrate decreases the rate of reaction? Also, for the question with the image of the chromosomes and crossing over, I only wrote one of the possible 4. Reckon theyll take the mark away? What do u reckon will be band 6 o.o   

I think the reason why it’s D for Q20 cause an enzyme-substrate reaction causes the substrate to break down, thus decreasing concentration of substrate. This was given as a hint for the first question of Q21 if you observed the diagram carefully and made links!

I got that question wrong too :/ realised when I got out of the exam that I could’ve used the diagram