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March 29, 2024, 07:21:17 am

Author Topic: VCE Biology Question Thread  (Read 3570926 times)  Share 

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Acegtr

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Re: VCE Biology Question Thread
« Reply #13440 on: May 15, 2021, 05:09:22 pm »
0
Hi,
In terms of animal hormones, why is there a need for hormones that are long polypeptide chains and hormones which are just amino acid-derived and much smaller? I understand that lipid-based hormones are there so that they can freely pass across cell membranes, but why is there a need for two types of hormones, both of which are made from amino acids?

wingdings2791

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Re: VCE Biology Question Thread
« Reply #13441 on: May 15, 2021, 09:41:38 pm »
+1
Hi,
In terms of animal hormones, why is there a need for hormones that are long polypeptide chains and hormones which are just amino acid-derived and much smaller? I understand that lipid-based hormones are there so that they can freely pass across cell membranes, but why is there a need for two types of hormones, both of which are made from amino acids?
Hi Acegtr,
Animal systems need to carry out many, many different functions and so need many, many different ways to transmit cellular signals. Remember that the tertiary/quaternary structure of a protein molecule determines its ability to bind to certain receptors/substrates (and therefore its function). Animals need differently shaped peptides so they can bind to different receptors -> promote different cellular responses. To fulfill the need for these different shapes and functions, some hydrophilic hormones will be long polypeptide chains, whereas others will be single amino acids.
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Oynx

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Re: VCE Biology Question Thread
« Reply #13442 on: May 15, 2021, 09:50:35 pm »
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Hey

Is this VCE bio knowledge?

The control and regulation of carbon dioxide concentration levels in arterial blood is due to the
A. endocrine and nervous systems.
B. nervous system.
C. endocrine system.
D. diaphragm muscles.

What would be the answer and why?

Thanks
2021 - Biology | Further mathematics

Chocolatepistachio

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Re: VCE Biology Question Thread
« Reply #13443 on: May 16, 2021, 05:24:01 pm »
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Nodes of ranvier are the spaces between sections of axon wrapped with myelin. Because myelin creates an insulating layer that prevents ion flow. The action potential  “jumps” from node to node thus speeding up transmission down the axon.

How will the action potential be  affected if the nodes of ranvier are closer together?
A action potentials will increase in amplitude
B action potentials will travel faster
C action potentials will travel slower
D action potentials will decrease in amplitude

Would it be c

Bri MT

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Re: VCE Biology Question Thread
« Reply #13444 on: May 16, 2021, 10:01:30 pm »
+2
Nodes of ranvier are the spaces between sections of axon wrapped with myelin. Because myelin creates an insulating layer that prevents ion flow. The action potential  “jumps” from node to node thus speeding up transmission down the axon.

How will the action potential be  affected if the nodes of ranvier are closer together?
A action potentials will increase in amplitude
B action potentials will travel faster
C action potentials will travel slower
D action potentials will decrease in amplitude

Would it be c

Not relevant to the current study design but yeah that's the answer they'd want

Chocolatepistachio

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Re: VCE Biology Question Thread
« Reply #13445 on: May 17, 2021, 03:16:35 pm »
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Mitochondria are not classified as part of the endomembrane system. Why not?
A they have too many vesicles
B  they structure is not derived from ER or The Golgi apparatus
C they are not involved in protein synthesis
D they are not attached to the outer nuclear envelope

Wouldn’t all the options be wrong none of these are really the reason why they aren’t part

Chocolatepistachio

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Re: VCE Biology Question Thread
« Reply #13446 on: May 19, 2021, 03:05:35 pm »
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Oxygen diffuses from blood cells down its concentration gradient. As cells become more active and the rate of aerobic cellular respiration increases, which of the following will occur?
A the concentration gradient for oxygen decreases and less oxygen will move into the cell
B the concentration gradient for oxygen increases and less oxygen will move into the cell
C the concentration gradient for oxygen decreases and more oxygen will move into the cell
D the concentration gradient for oxygen increases and more oxygen will move into the cell

Would this be d

Owlbird83

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Re: VCE Biology Question Thread
« Reply #13447 on: May 19, 2021, 03:46:03 pm »
+3
Oxygen diffuses from blood cells down its concentration gradient. As cells become more active and the rate of aerobic cellular respiration increases, which of the following will occur?
A the concentration gradient for oxygen decreases and less oxygen will move into the cell
B the concentration gradient for oxygen increases and less oxygen will move into the cell
C the concentration gradient for oxygen decreases and more oxygen will move into the cell
D the concentration gradient for oxygen increases and more oxygen will move into the cell

Would this be d
Yeah d is correct as the cells would be using up more oxygen when active so there would be a greater difference between intracellular and extracellular oxygen concentrations.

Mitochondria are not classified as part of the endomembrane system. Why not?
A they have too many vesicles
B  they structure is not derived from ER or The Golgi apparatus
C they are not involved in protein synthesis
D they are not attached to the outer nuclear envelope

Wouldn’t all the options be wrong none of these are really the reason why they aren’t part
I'm not completely sure on this. After googling it looks like both reasons of: the function being different (doesn't exchange materials with endomembrane system organelles) and the structure being different (not connected with other organelles) comes up. This makes me think it's either C or B. This quora thread has good info, but i still am unsure which letter option would fit the best, maybe check it out and see what you think.
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Chocolatepistachio

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Re: VCE Biology Question Thread
« Reply #13448 on: May 20, 2021, 01:57:46 pm »
0
During initiation during transcription does helicase unwind a segment of the DNA double helix and then during elongation the RNA polymerase unwinds the rest of the DNA

biology1234

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Re: VCE Biology Question Thread
« Reply #13449 on: May 21, 2021, 07:43:52 pm »
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Hi, I was wondering does anyone have any unit 1/2 practice exams or their actual exams they did for it. I would appreciate it very much. Either send here or on private thread. Thank you :)

Chocolatepistachio

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Re: VCE Biology Question Thread
« Reply #13450 on: May 21, 2021, 08:02:28 pm »
+3
Many SACs and practice exams are copyrighted and can’t be distributed on the forum so it would probably be better to ask your teacher

Chocolatepistachio

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Re: VCE Biology Question Thread
« Reply #13451 on: May 21, 2021, 08:41:36 pm »
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Which of the following statements about osmosis is not true?
A a red blood cell in hypertonic solution may shrink (cremate) because of osmosis
B cells can regulate osmosis by regulating the number of aquaporins in the cell membrane
C osmosis occurs only in living systems
D a red blood cell in hypotonic solution  may lyse because of osmosis

Would this be c but doesn’t diffusion occur in non living and living but osmosis is only in living systems so all options are correct

Oynx

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Re: VCE Biology Question Thread
« Reply #13452 on: May 22, 2021, 06:42:03 pm »
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Hi

Can large populations have low genetic diversity?

Thanks
2021 - Biology | Further mathematics

PhoenixxFire

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Re: VCE Biology Question Thread
« Reply #13453 on: May 22, 2021, 08:14:26 pm »
+4
Which of the following statements about osmosis is not true?
A a red blood cell in hypertonic solution may shrink (cremate) because of osmosis
B cells can regulate osmosis by regulating the number of aquaporins in the cell membrane
C osmosis occurs only in living systems
D a red blood cell in hypotonic solution  may lyse because of osmosis

Would this be c but doesn’t diffusion occur in non living and living but osmosis is only in living systems so all options are correct

osmosis doesnt have to be in living systems. Its essentially the same as diffusion but it's the water moving not the solute.

Hi

Can large populations have low genetic diversity?

Thanks
What do you think?

During initiation during transcription does helicase unwind a segment of the DNA double helix and then during elongation the RNA polymerase unwinds the rest of the DNA
dna helicase is invved in replication not transcription. Its a bit complicated and varies between prokaryotes and eukaryotes but for vce it's enough to just mention the role of RNA polymerase.

Hey

Is this VCE bio knowledge?

The control and regulation of carbon dioxide concentration levels in arterial blood is due to the
A. endocrine and nervous systems.
B. nervous system.
C. endocrine system.
D. diaphragm muscles.

What would be the answer and why?

Thanks
It isnt specifically part of vce but you do need to know that hormonal is slow, long lasting changes and nervous system is fast changes. The answer is B, you dont need to know that but you do need to be able to apply that knowledge to a scenario you're given.

Are the inputs of glycolysis glucose, 2NAD+, 2 ATP, 4 ADP, 2Pi

Or why do some say it’s 2ADP + Pi
When saying where glycolysis takes place would cytosol be more correct than cytoplasm

During glycolysis Aren’t 4 molecules of ADP converted into ATP
Its 2 nad+, 2 atp, 2 adp, 2 pi. (Plus glucose, water etc.)
It isnt 4 ADP because you have the 2 atp as input. They're essentially broken apart and then put back together again so they're atp in both input and output.

Yes cytosol is more correct as it does not involve the organelles.

how much do i need to know about the timeline on earth? do i have to memorise all of the events that occurred like cambrian explosion or when multicellularity occurred and also like the dates when these events happened.
You dont need to know specific dates, you do need to know the order. I'm on mobile so I cant find it right now but there was a good example of this on the 2017 exam.
« Last Edit: May 22, 2021, 08:42:04 pm by PhoenixxFire »
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Chocolatepistachio

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Re: VCE Biology Question Thread
« Reply #13454 on: May 24, 2021, 12:46:44 am »
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For this question would it be c
A cell divides to produce gametes. This process will:
A supply cells to replace damaged tissues
B involve only one division of the nucleus
C produce haploid cells
D produce cells that are genetically identical