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March 28, 2024, 07:38:12 pm

Author Topic: VCE Biology Question Thread  (Read 3570298 times)  Share 

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Chocolatepistachio

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Re: VCE Biology Question Thread
« Reply #13620 on: July 21, 2021, 09:16:57 pm »
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Alternative splicing can produce different mRNA molecules from the same transcript
Would this be true

rRNA plays a catalytic role in protein synthesis
Would this be true

Billuminati

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Re: VCE Biology Question Thread
« Reply #13621 on: July 21, 2021, 10:19:48 pm »
+3
Alternative splicing can produce different mRNA molecules from the same transcript
Would this be true

rRNA plays a catalytic role in protein synthesis
Would this be true

Both statements are true. Alternative splicing is when you have a gene coding for several proteins depending on which exons are retained during splicing. Before proteins were catalytic, my 1st year biomed molecular bio professors taught me that RNA actually functioned like the protein-based enzymes of today according to the RNA world hypothesis, and rRNA along with a few other forms of RNA not covered in VCE still retain their catalytic trait to some extent today.
« Last Edit: July 21, 2021, 10:21:42 pm by Billuminati »
VCE 2016-2018

2017: Biology [38], Further Maths [44]

2018: Methods [37], French [38], Chem [40], English [44]

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2019-2021: Bachelor of Biomedical Science at Monash (Scholars), minoring in Chemistry

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Chocolatepistachio

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Re: VCE Biology Question Thread
« Reply #13622 on: July 22, 2021, 05:11:26 pm »
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The position of the head with respect to gravity is determined by the
A shift in fluid in the semicircular canals
B movements of otoliths (calcium carbonate crystal) in response to gravity
C movements of perilymph in the vestibular chamber
D impulses transmitted from the macula of the semicircular canals

Can someone explain why this is b

biology1234

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Re: VCE Biology Question Thread
« Reply #13623 on: July 22, 2021, 06:54:16 pm »
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I have a question about the cell cycle
In anaphase when the sister chromatids are pulled to opposite ends by spindle fibres, do they then from their are the genetically identical chromosomes in mitosis. If someone could clarify that would be great. Thank you

Billuminati

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Re: VCE Biology Question Thread
« Reply #13624 on: July 22, 2021, 07:10:58 pm »
+3
The position of the head with respect to gravity is determined by the
A shift in fluid in the semicircular canals
B movements of otoliths (calcium carbonate crystal) in response to gravity
C movements of perilymph in the vestibular chamber
D impulses transmitted from the macula of the semicircular canals

Can someone explain why this is b

I'm not even taught this in 2nd year biomed anatomy and physiology, all we were told is that balance info is transmitted from the sensory CNVIII (vestibulocochlear nerve) to your brain, and your brain uses that feedback to adjust your head posture through the somatic nervous system
VCE 2016-2018

2017: Biology [38], Further Maths [44]

2018: Methods [37], French [38], Chem [40], English [44]

UMAT: 56/43/80, 57th percentile (LLLLOOOOOOOOOLLLLLLLL)

ATAR: 98.1

2019-2021: Bachelor of Biomedical Science at Monash (Scholars), minoring in Chemistry

GAMSAT September 2021: 65/67/86, 76 overall (98th percentile)

2022: Chilling

2023+: Transfer to teaching degree

Billuminati

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Re: VCE Biology Question Thread
« Reply #13625 on: July 22, 2021, 07:14:53 pm »
+1
I have a question about the cell cycle
In anaphase when the sister chromatids are pulled to opposite ends by spindle fibres, do they then from their are the genetically identical chromosomes in mitosis. If someone could clarify that would be great. Thank you

I don't quite understand the wording of your question, but yes they will become the chromosomes of each daughter cell. They will go through the S phase of interphase to be double stranded again, ready for the next mitotic division
VCE 2016-2018

2017: Biology [38], Further Maths [44]

2018: Methods [37], French [38], Chem [40], English [44]

UMAT: 56/43/80, 57th percentile (LLLLOOOOOOOOOLLLLLLLL)

ATAR: 98.1

2019-2021: Bachelor of Biomedical Science at Monash (Scholars), minoring in Chemistry

GAMSAT September 2021: 65/67/86, 76 overall (98th percentile)

2022: Chilling

2023+: Transfer to teaching degree

biology1234

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Re: VCE Biology Question Thread
« Reply #13626 on: July 23, 2021, 10:52:07 am »
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Thank you for your help

Chocolatepistachio

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Re: VCE Biology Question Thread
« Reply #13627 on: July 23, 2021, 11:21:04 am »
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Hydrogen bonds can break at high temperatures. Which of the following macromolecules is likely to break apart or change shape at high temperatures? 
A) DNA 
B) RNA 
C) Triglycerides 
D) Proteins 
E) Polysaccharides

Would this be both DNA and rna

Billuminati

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Re: VCE Biology Question Thread
« Reply #13628 on: July 23, 2021, 11:30:54 am »
+2
Hydrogen bonds can break at high temperatures. Which of the following macromolecules is likely to break apart or change shape at high temperatures?
A) DNA
B) RNA
C) Triglycerides
D) Proteins
E) Polysaccharides

Would this be both DNA and rna

It will be DNA and proteins. RNA is single stranded so it won’t really break apart under high temperatures, they’re held together by covalent phosphodiester bonds which are stronger than H-bonds (remember intramolecular forces are a lot stronger than intermolecular forces). DNA unzips at 92°C because the H-bonds between the base pairs are distrupted and proteins also denature at temperatures above their optimal temperature since H-bonds that make up their 2° and 3° structures are distrupted
« Last Edit: July 23, 2021, 11:57:13 am by Billuminati »
VCE 2016-2018

2017: Biology [38], Further Maths [44]

2018: Methods [37], French [38], Chem [40], English [44]

UMAT: 56/43/80, 57th percentile (LLLLOOOOOOOOOLLLLLLLL)

ATAR: 98.1

2019-2021: Bachelor of Biomedical Science at Monash (Scholars), minoring in Chemistry

GAMSAT September 2021: 65/67/86, 76 overall (98th percentile)

2022: Chilling

2023+: Transfer to teaching degree

Chocolatepistachio

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Re: VCE Biology Question Thread
« Reply #13629 on: July 23, 2021, 05:53:41 pm »
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Thanks

Epinephrine (a hormone/ first messenger) increases the force of contraction of heart muscle. In the absence of epinephrine phenylephrine is used as a drug to increase the force of contraction of heart muscles via a signalling pathway that involves a receptor and cAMP. Which of the following are plausible mechanism of action of phenylephrine.
A phenylephrine is acting as an agonist of epinephrine
B phenylephrine is acting as an antagonist  of epinephrine
C phenylephrine is acting as an allosteric modulator
D phenylephrine is acting as a covalent modulator

Would this be a

Billuminati

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Re: VCE Biology Question Thread
« Reply #13630 on: July 23, 2021, 06:01:19 pm »
+2
Thanks

Epinephrine (a hormone/ first messenger) increases the force of contraction of heart muscle. In the absence of epinephrine phenylephrine is used as a drug to increase the force of contraction of heart muscles via a signalling pathway that involves a receptor and cAMP. Which of the following are plausible mechanism of action of phenylephrine.
A phenylephrine is acting as an agonist of epinephrine
B phenylephrine is acting as an antagonist  of epinephrine
C phenylephrine is acting as an allosteric modulator
D phenylephrine is acting as a covalent modulator

Would this be a

Yes, phenylephrine is a sympathomimetic ie an adrenergic agonist. It activates the same pathway as adrenaline when it binds to the beta-1 adrenoreceptors because it has a similar molecular shape to it.
VCE 2016-2018

2017: Biology [38], Further Maths [44]

2018: Methods [37], French [38], Chem [40], English [44]

UMAT: 56/43/80, 57th percentile (LLLLOOOOOOOOOLLLLLLLL)

ATAR: 98.1

2019-2021: Bachelor of Biomedical Science at Monash (Scholars), minoring in Chemistry

GAMSAT September 2021: 65/67/86, 76 overall (98th percentile)

2022: Chilling

2023+: Transfer to teaching degree

biology1234

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Re: VCE Biology Question Thread
« Reply #13631 on: July 23, 2021, 06:16:34 pm »
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In telophase, is two genetically identical cells produced. what is the difference between this and then the next stage cytokinesis

Chocolatepistachio

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Re: VCE Biology Question Thread
« Reply #13632 on: July 23, 2021, 06:47:21 pm »
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No they are not produced in telophase
In telophase chromosomes clustered at opposite poles decondense back into chromatin as a nuclear envelope reforms around them.The spindle is disassembled

Cytokinesis is the division of the cytoplasm. In animal cells the cleavage furrow forms to divide the cells. In plant cells the cell plate forms

Billuminati

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Re: VCE Biology Question Thread
« Reply #13633 on: July 23, 2021, 06:49:11 pm »
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In telophase, is two genetically identical cells produced. what is the difference between this and then the next stage cytokinesis

Telophase= separation of genetic material
Cytokinesis= separation of cytoplasm
VCE 2016-2018

2017: Biology [38], Further Maths [44]

2018: Methods [37], French [38], Chem [40], English [44]

UMAT: 56/43/80, 57th percentile (LLLLOOOOOOOOOLLLLLLLL)

ATAR: 98.1

2019-2021: Bachelor of Biomedical Science at Monash (Scholars), minoring in Chemistry

GAMSAT September 2021: 65/67/86, 76 overall (98th percentile)

2022: Chilling

2023+: Transfer to teaching degree

Chocolatepistachio

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Re: VCE Biology Question Thread
« Reply #13634 on: July 23, 2021, 06:52:28 pm »
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If someone could help with this question
Using the law of Laplace explain how surfactants stabilise alveoli of different sizes that share the same alveolar duct