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June 21, 2021, 05:42:01 pm

Author Topic: VCE Biology Question Thread  (Read 2246199 times)  Share 

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specimen

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Re: VCE Biology Question Thread
« Reply #13440 on: May 05, 2021, 08:58:20 pm »
0
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.

Chocolatepistachio

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Re: VCE Biology Question Thread
« Reply #13441 on: May 06, 2021, 08:59:34 pm »
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A protein (found in blood) is produced by the pancreas and acts on receptors on target liver cells. What type of signalling molecule is it most likely to be?
A hormone
B paracrine signal
C a neurotransmitter
D an autocrine signal

It’s found in blood so would it just be a

Sine

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Re: VCE Biology Question Thread
« Reply #13442 on: May 06, 2021, 09:15:26 pm »
+5
A protein (found in blood) is produced by the pancreas and acts on receptors on target liver cells. What type of signalling molecule is it most likely to be?
A hormone
B paracrine signal
C a neurotransmitter
D an autocrine signal

It’s found in blood so would it just be a
Yeah that would be the most correct answer and probably what the question is getting at.

However, the actual signalling type would be endocrine.
« Last Edit: May 06, 2021, 09:17:30 pm by Sine »

tiredandstressed

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Re: VCE Biology Question Thread
« Reply #13443 on: May 06, 2021, 09:16:16 pm »
+4
A protein (found in blood) is produced by the pancreas and acts on receptors on target liver cells. What type of signalling molecule is it most likely to be?
A hormone
B paracrine signal
C a neurotransmitter
D an autocrine signal


It’s found in blood so would it just be a
Correct its A!
But also the hormone is produced in the pancreas and the receptor is in the liver, therefore,
It can't be autocrine since the signal would go back to the same cell and it can't be paracrine since the pancreas and liver are not 'nearby' in this context.
Thus A is most likely to be correct.

Edit: Sine bet me to it
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Chocolatepistachio

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Re: VCE Biology Question Thread
« Reply #13444 on: May 08, 2021, 07:13:26 pm »
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How do cells know which regions should be classed as introns or exons

Chocolatepistachio

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Re: VCE Biology Question Thread
« Reply #13445 on: May 09, 2021, 08:48:51 pm »
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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

Acegtr

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Re: VCE Biology Question Thread
« Reply #13446 on: May 15, 2021, 05:09:22 pm »
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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 #13447 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 #13448 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 #13449 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

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Re: VCE Biology Question Thread
« Reply #13450 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 #13451 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 #13452 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 #13453 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 #13454 on: May 20, 2021, 01:57:46 pm »
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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