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September 24, 2021, 12:21:03 pm

Author Topic: VCE Biology Question Thread  (Read 2456732 times)  Share 

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Billuminati

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Re: VCE Biology Question Thread
« Reply #13650 on: August 02, 2021, 02:12:14 am »
+2
If someone could help with this question
Which of the following chemical messengers is able to cross the phopholipid bilayer of the cell membrane?
A amino acids
B amines (excluding thyroid hormone)
C peptides
D eicosanoids

It's D because eicosanoids are fatty acid derivatives and are therefore hydrophobic
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biology1234

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Re: VCE Biology Question Thread
« Reply #13651 on: August 03, 2021, 05:55:32 pm »
0
During which stage of mitosis do the centromeres split?
Would this be during anaphase, as I know that spindle fibres pull sister chromatids to opposite ends of cell.

biology1234

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Re: VCE Biology Question Thread
« Reply #13652 on: August 03, 2021, 05:56:41 pm »
0
what is difference between cytokinesis in animal cells and cytokinesis in plate cells.

tiredandstressed

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Re: VCE Biology Question Thread
« Reply #13653 on: August 03, 2021, 10:37:50 pm »
+5
what is difference between cytokinesis in animal cells and cytokinesis in plate cells.
To answer your questions let's review what is cytokinesis
Cytokinesis: is the division of cytoplasm
Cytosol and organelles in the cytosol are distributed around the new nuclei
These all then become enclosed within a new plasma membrane

Plants require the development of a cell plate due to the presence of the cell wall , however, animal cells do not have this process due to the absence of a cell wall

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greenpaper

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Re: VCE Biology Question Thread
« Reply #13654 on: August 05, 2021, 11:57:00 am »
0
The study design discusses the following dot point- the key events in meiosis that result in the production of gametes from somatic cells.
What does it mean by from somatic cells?

Chocolatepistachio

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Re: VCE Biology Question Thread
« Reply #13655 on: August 05, 2021, 12:58:11 pm »
+3
Any cell in the body except sex cells

Chocolatepistachio

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Re: VCE Biology Question Thread
« Reply #13656 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

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Re: VCE Biology Question Thread
« Reply #13657 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 »
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Chocolatepistachio

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Re: VCE Biology Question Thread
« Reply #13658 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

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Re: VCE Biology Question Thread
« Reply #13659 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
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biology1234

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Re: VCE Biology Question Thread
« Reply #13660 on: August 08, 2021, 03:27:04 pm »
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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

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Re: VCE Biology Question Thread
« Reply #13661 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
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Chocolatepistachio

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Re: VCE Biology Question Thread
« Reply #13662 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

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Re: VCE Biology Question Thread
« Reply #13663 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).
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Chocolatepistachio

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Re: VCE Biology Question Thread
« Reply #13664 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