Login

Welcome, Guest. Please login or register.

March 29, 2024, 10:14:26 am

Author Topic: VCE Biology Question Thread  (Read 3571044 times)  Share 

0 Members and 6 Guests are viewing this topic.

Chocolatepistachio

  • Science Games: Silver
  • Forum Obsessive
  • ***
  • Posts: 470
  • Respect: +51
Re: VCE Biology Question Thread
« Reply #13650 on: August 05, 2021, 01:00:58 pm »
0
If someone could help with this question
Nicotinic receptors are expressed on membranes of skeletal muscle cells. Which of the following would likely be a side effect of the use of nicotine, an agonist of acetylcholine for those receptors?
A muscle fatigue
B increased muscle cell twitches (contractions)
C muscle paralysis
D drowsiness

Billuminati

  • Science Games: Gold
  • Forum Obsessive
  • ***
  • Posts: 300
  • Respect: +127
Re: VCE Biology Question Thread
« Reply #13651 on: August 05, 2021, 02:14:54 pm »
+2
If someone could help with this question
Nicotinic receptors are expressed on membranes of skeletal muscle cells. Which of the following would likely be a side effect of the use of nicotine, an agonist of acetylcholine for those receptors?
A muscle fatigue
B increased muscle cell twitches (contractions)
C muscle paralysis
D drowsiness

Since acetylcholine is the neurotransmitter of the somatic nervous system which controls skeletal muscles, a cholinergic agonist like nicotine has a similar effect to acetylcholine due to activating the same acetylcholine receptors which will increase skeletal muscle contractions
« Last Edit: August 05, 2021, 02:24:07 pm 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

  • Science Games: Silver
  • Forum Obsessive
  • ***
  • Posts: 470
  • Respect: +51
Re: VCE Biology Question Thread
« Reply #13652 on: August 07, 2021, 06:06:58 pm »
0
The greater the ligand concentration needed to achieve 50% saturation of a particular binding site on a protein the higher the affinity of the binding site for that ligand.
Why is this false

Billuminati

  • Science Games: Gold
  • Forum Obsessive
  • ***
  • Posts: 300
  • Respect: +127
Re: VCE Biology Question Thread
« Reply #13653 on: August 07, 2021, 09:02:33 pm »
+1
The greater the ligand concentration needed to achieve 50% saturation of a particular binding site on a protein the higher the affinity of the binding site for that ligand.
Why is this false

If it has high affinity, the ligand binds the protein easily so you won’t need so much of it to make sure that 50% of the protein molecules are bound
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

  • Forum Regular
  • **
  • Posts: 84
  • Respect: 0
Re: VCE Biology Question Thread
« Reply #13654 on: August 08, 2021, 03:27:04 pm »
0
Why do gametes only contain half the amount of genetic information of the parent cells? Also, what does it mean that meiosis produces 4 daughter cells
Is this because it is sexual reproduction and that it does not want to produce genetically identical cells.

Billuminati

  • Science Games: Gold
  • Forum Obsessive
  • ***
  • Posts: 300
  • Respect: +127
Re: VCE Biology Question Thread
« Reply #13655 on: August 08, 2021, 04:49:34 pm »
+2
Why do gametes only contain half the amount of genetic information of the parent cells? Also, what does it mean that meiosis produces 4 daughter cells
Is this because it is sexual reproduction and that it does not want to produce genetically identical cells.

Gametes are haploid as there's no S phase (DNA replication) before the 2nd division. Due to crossing over and recombination, each daughter cell at the end of the 2 divisions of meiosis (22=4) will be genetically different
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

  • Science Games: Silver
  • Forum Obsessive
  • ***
  • Posts: 470
  • Respect: +51
Re: VCE Biology Question Thread
« Reply #13656 on: August 08, 2021, 05:04:18 pm »
0
Five year old Charlie is so mad that he is holding his breath until he gets his way. What will stimulate his breathing rate to return to normal?
A accumulation of carbon dioxide
B lack of oxygen
C lack of sensory information being sent to central chemoreceptors
D lack of sensory information being sent to peripheral chemoreceptors

Would this be a

Billuminati

  • Science Games: Gold
  • Forum Obsessive
  • ***
  • Posts: 300
  • Respect: +127
Re: VCE Biology Question Thread
« Reply #13657 on: August 08, 2021, 10:42:52 pm »
+1
Five year old Charlie is so mad that he is holding his breath until he gets his way. What will stimulate his breathing rate to return to normal?
A accumulation of carbon dioxide
B lack of oxygen
C lack of sensory information being sent to central chemoreceptors
D lack of sensory information being sent to peripheral chemoreceptors

Would this be a

I think so. Cuz your chemoreceptors detect an increase in CO2 indirectly by monitoring an increase in [H+] ie a reduction in pH (remember more CO2= more H2CO3).
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

  • Science Games: Silver
  • Forum Obsessive
  • ***
  • Posts: 470
  • Respect: +51
Re: VCE Biology Question Thread
« Reply #13658 on: August 09, 2021, 02:50:30 pm »
0
At lower temperatures do more saturated fats make up the membrane

Is there a certain temp where it goes from unsaturated to saturated

Chocolatepistachio

  • Science Games: Silver
  • Forum Obsessive
  • ***
  • Posts: 470
  • Respect: +51
Re: VCE Biology Question Thread
« Reply #13659 on: August 11, 2021, 04:59:15 pm »
0
Which of the following triggers hyperventilation?
A high partial pressure of oxygen in arterial blood
B low partial pressure of carbon dioxide in arterial blood
C low concentration of hydrogen ions in arterial blood
D high partial pressure of carbon dioxide in arterial blood

Would this be d

Sine

  • Werewolf
  • National Moderator
  • Great Wonder of ATAR Notes
  • *****
  • Posts: 5135
  • Respect: +2103
Re: VCE Biology Question Thread
« Reply #13660 on: August 11, 2021, 06:31:51 pm »
+3
Which of the following triggers hyperventilation?
A high partial pressure of oxygen in arterial blood
B low partial pressure of carbon dioxide in arterial blood
C low concentration of hydrogen ions in arterial blood
D high partial pressure of carbon dioxide in arterial blood

Would this be d
what is your reasoning behind d?

Billuminati

  • Science Games: Gold
  • Forum Obsessive
  • ***
  • Posts: 300
  • Respect: +127
Re: VCE Biology Question Thread
« Reply #13661 on: August 11, 2021, 08:22:54 pm »
+3
Which of the following triggers hyperventilation?
A high partial pressure of oxygen in arterial blood
B low partial pressure of carbon dioxide in arterial blood
C low concentration of hydrogen ions in arterial blood
D high partial pressure of carbon dioxide in arterial blood

Would this be d

Remember hyperventilation increases pH due to removing CO2 and by Le Chatelier's Principle, the bicarbonate buffer system will consume H+ to make CO2 to replace the exhaled CO2. You normally want to do this when pH is too low ie [H+] too high in your blood to bring it back to normal, going by Sine's approach of not giving away the answer, given all of this, which of these scenarios fits that description?
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

  • Science Games: Silver
  • Forum Obsessive
  • ***
  • Posts: 470
  • Respect: +51
Re: VCE Biology Question Thread
« Reply #13662 on: August 11, 2021, 09:03:59 pm »
0
So it would be low partial pressure  co2 not high

Billuminati

  • Science Games: Gold
  • Forum Obsessive
  • ***
  • Posts: 300
  • Respect: +127
Re: VCE Biology Question Thread
« Reply #13663 on: August 11, 2021, 09:09:55 pm »
+1
So it would be low partial pressure  co2 not high

High Pa CO2 will attract hyperventilation. High CO2= high H+, you need hyperventilation to decrease H+
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

  • Science Games: Silver
  • Forum Obsessive
  • ***
  • Posts: 470
  • Respect: +51
Re: VCE Biology Question Thread
« Reply #13664 on: August 11, 2021, 10:11:48 pm »
0
Wait so it is d