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July 06, 2020, 03:28:35 pm

Author Topic: VCE Biology Question Thread  (Read 1723707 times)  Share 

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PhoenixxFire

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Re: VCE Biology Question Thread
« Reply #12585 on: June 05, 2020, 08:01:43 pm »
+7
*Brushes off cobwebs* Been way too many pages without a post from me.

Could you say the light dependent reaction takes place in the grana or would that be incorrect and do you have to say thylakoid membranes
2012 exam suggested answer was grana so that should be fine.

What is a good definition for exocrine signalling and neurotransmitters? And what points should I make when describing what a second messenger is? Thanks
Hi! Does anyone know a really good definition for vaccinations?
Hey,
Trying to memorise other people's definitions is a bit hard - a better way for you to learn is for you to come up with your own definition and then edit it to be as concise as possible. If you'd like to have a go at coming up with a definition, feel free to post it here for feedback :)

would it be correct if for ribosomes relating structure to function you said
RNA bind to mRNA to produce protein via the process of translation. translate an mRNA sequence into a polypeptide.
If you're relating structure to function then you'll probably need to be more specific and talk about the EPA sites and how they allow for the production of the polypeptide - how much detail you need will depend on how many marks the question is worth.
Also for vacuoles relating structure to function would it be correct if you said they are involved in intracellular digestion and release of cellular waste products. maintain water balance in cells.

Thanks!
You're not really explaining how the structure relates to the function here. You could talk about their shape or them being membrane bound.

Hello

For the question of leaves are removed transpiration stops. Explain why this is so

Would this be a sufficient answer:
Transpiration is the evaporation of water from the leaves of a plant through the stomata. The stomata are present on the underside of the leaf therefore if leaves are removed there will be no stomata and transpiration will not be able to occur
Yep, this shoud be fine.

Hello!

Hope you all are doing well. I have a question on apoptosis.

List two examples of situations that could trigger the mitochondrial pathway of apoptosis and List three examples of situations that could trigger the external death receptor pathway of apoptosis.

The first one I can answer with things like 'the viral infection of a cell can cause it to perform apoptosis to prevent any further spread' and 'When a cell's genome is damaged'. However, I cannot think of enough answers for the second question. I'm not even sure if the questions were asking for these answers.  :'(

Any help would be appreciated :)
Cancer (causing changes to the mhc marker or polypeptide fragments), transplanted tissue, or viral infection (identified by Tc cell) could cause external apoptosis

Also is co2 involved with the Photolysis of water or it it just used in the light independent stage?
Just in the light independent stage.
Is the difference between cytosol and cytoplasm that cytoplasm is the fluid and organelles  surrounding except the nucleus whereas cytosol is just the fluid without the organelles
Yep.

Please let me know if anything seems a bit off - it's been a while since I've thought about bio. Also let me know if I've missed any questions!
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Amelia257

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Re: VCE Biology Question Thread
« Reply #12586 on: June 05, 2020, 09:05:29 pm »
0
Hello

Coat colour inheritance in certain cats is sex linked and codominant
Male cats can have yellow or black coat colours . Female cats may be yellow, black or tortoiseshell in colour. What would be the probability of having yellow female offspring if a tortoiseshell  female is crossed with a yellow male?
A 0%
B 25%
C 50%
D 75%
Why is the answer for this question B
Canít work it out

Thank you

How do you work out what the alleles are for the tortoiseshell female and the yellow male
« Last Edit: June 05, 2020, 09:08:03 pm by Amelia257 »

GodNifty

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Re: VCE Biology Question Thread
« Reply #12587 on: June 06, 2020, 09:27:38 pm »
+3
How do you work out what the alleles are for the tortoiseshell female and the yellow male
You were given the information that coat colour inheritance is co-dominant (and sex-linked).

Let A = Black
Let a = Yellow
Note that the question doesn't signify which allele is the dominant one, but it doesn't matter as you'll produce the same answer if you made 'A = Yellow' and 'a = Black'

If it were homozygous, you'd be producing one colour only, so what genotype will co-dominance give?

Try the question out yourself, it can definitely trip you up, but make sure you note that it is sex-linked - this piece of information is important.

Let me know if you need further assistance, I just did it and I'm very impressed with the question itself.

Amelia257

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Re: VCE Biology Question Thread
« Reply #12588 on: June 06, 2020, 09:46:49 pm »
0
Ohh ok. Thanks

So I did X^A x a crossed with x ^a y

thereís only 1 x^a xa  which is yellow so itís 25%

GodNifty

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Re: VCE Biology Question Thread
« Reply #12589 on: June 06, 2020, 09:54:12 pm »
0
Ohh ok. Thanks

So I did X^A x a crossed with x ^a y

thereís only 1 x^a xa  which is yellow so itís 25%
Smashed it, great work!

Strawbery47

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Re: VCE Biology Question Thread
« Reply #12590 on: June 06, 2020, 10:00:05 pm »
0
If you were doing an experiment to test the effect of co2 on plant growth and you were keeping the plants in separate chambers in a glasshouse  what type of co2 regulator can be used to regulate the amount of co2 plants are exposed to

Could a PID controller be used and how does it work.

Also why does the concentration of co2 affect plant growth

tigerclouds

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Re: VCE Biology Question Thread
« Reply #12591 on: June 08, 2020, 10:25:52 am »
0
Hi guys,
What is the difference between effector T cells and the other T cells (helper, cytotoxic and regulatory)? Because Iíve noticed that there are effector Tc and Th cells so does that mean that effector T cells are just a way of further categorizing the major types of T cells and differentiating them from memory cells? And do memory T cells basically act like effector T cells, except that they donít need to be used yet so will wait for the second pathogen encounter in which it will act as an effector cell?

Chocolatepistachio

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Re: VCE Biology Question Thread
« Reply #12592 on: June 08, 2020, 11:36:26 am »
0
Hello
For this question
Grasshoppers are quite different to humans . The female melanoplus grasshopper has a diploid chromosomes number of 24. The male melanoplus grasshopper has a diploid chromosome number of 23. How many chromosomes would you expect to find in the gametes of males and females.

Would it be ova (egg) 12 chromosomes sperm 11.5 chromosomes or
ova(egg) 12 chromosomes sperm 11 or 12 chromosomes

Chocolatepistachio

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Re: VCE Biology Question Thread
« Reply #12593 on: June 08, 2020, 12:36:44 pm »
0
For this question:
A horse (diploid number 2n=64) and a donkey (diploid number 2n=62 ) can mate and produce offspring called a mule. Mules cannot produce offspring. At which classification level would horses, donkeys and mules be most similar
A kingdom
B Phylum
C Species
D genus

Would the answer be d??

Sine

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Re: VCE Biology Question Thread
« Reply #12594 on: June 08, 2020, 01:26:36 pm »
+3
For this question:
A horse (diploid number 2n=64) and a donkey (diploid number 2n=62 ) can mate and produce offspring called a mule. Mules cannot produce offspring. At which classification level would horses, donkeys and mules be most similar
A kingdom
B Phylum
C Species
D genus

Would the answer be d??

Yeah, genus looks good. Can't be species since the definition we use for that is organisms that can produce a fertile offspring.
Kingdom and Phylum are both just too broad.

Chocolatepistachio

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Re: VCE Biology Question Thread
« Reply #12595 on: June 08, 2020, 03:08:58 pm »
0
How do you remember enzymes lower activation energy

And for this question ,

Aphids are insects that feed by inserting needle like mouthparts into the vascular tissue of plants. When the body of the insect is cut off leaving the mouthparts in place droplets of vascular fluid are forced out of the mouthparts. The aphid feeds on:
A the xylem where the fluid is under positive pressure
B  the phloem where the fluid is under negative pressure
C the xylem where the fluid is under negative pressure
D the phloem where the fluid is under positive pressure

Would it be c?
And
The fluid would contain:
A water and high levels of carbon dioxide
B water amino acids and sugars
C aphid faeces (wastes)
D water and mineral ions

Water and mineral ions right??

Chocolatepistachio

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Re: VCE Biology Question Thread
« Reply #12596 on: June 09, 2020, 11:03:18 am »
0
For this question:

How do guard cells regulate the closing of stomata
A Guard cells lose k+ions, lose water and decrease turgor pressure
B guard cell turgor pressure decreases due to increased air pressure inside air spaces
C guard cell turgor pressure increases due to increased air pressure inside air spaces
D guard cells gain k+ions gain water and increase turgor pressure

Would it be a ??

makram

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Re: VCE Biology Question Thread
« Reply #12597 on: June 10, 2020, 07:47:11 pm »
0
What is the difference between 'the number of notifications per 100,000' and 'the number of cases' with regards to vaccine programs? Which is better?

Chocolatepistachio

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Re: VCE Biology Question Thread
« Reply #12598 on: June 10, 2020, 11:56:40 pm »
0
Which came first the chicken or the egg

Do crossing over, Independent assortment and random segregation all occur in meiosis 1

PhoenixxFire

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Re: VCE Biology Question Thread
« Reply #12599 on: June 11, 2020, 10:18:43 am »
+3
If you were doing an experiment to test the effect of co2 on plant growth and you were keeping the plants in separate chambers in a glasshouse  what type of co2 regulator can be used to regulate the amount of co2 plants are exposed to

Could a PID controller be used and how does it work.

Also why does the concentration of co2 affect plant growth
The first part of this isn't something you need to know, don't worry about it. CO2 affects plant growth because it's an input for photosynthesis which is the process that makes glucose for the plant to use - and that glucose is needed for plant growth.

Hi guys,
What is the difference between effector T cells and the other T cells (helper, cytotoxic and regulatory)? Because Iíve noticed that there are effector Tc and Th cells so does that mean that effector T cells are just a way of further categorizing the major types of T cells and differentiating them from memory cells? And do memory T cells basically act like effector T cells, except that they donít need to be used yet so will wait for the second pathogen encounter in which it will act as an effector cell?
Yeah it's just to differentiate them from memory cells. Like how we say plasma and memory B cells (except B cells are different in ways other than name/lifespan). Yeah memory cells are essentially the same as the naive cells only there are more specific to the same antigen and they require less confirmation that they've bound the correct antigen (because they've already correctly identified it before). When memory cells encounter the antigen for a second (or subsequent) time, they'll differentiate into memory cells and effector cells again.

Hello
For this question
Grasshoppers are quite different to humans . The female melanoplus grasshopper has a diploid chromosomes number of 24. The male melanoplus grasshopper has a diploid chromosome number of 23. How many chromosomes would you expect to find in the gametes of males and females.

Would it be ova (egg) 12 chromosomes sperm 11.5 chromosomes or
ova(egg) 12 chromosomes sperm 11 or 12 chromosomes
It would be ova, 12 and sperm, 11 or 12. In humans sperm determines chromosomal sex by either having an X or a Y, in grasshoppers it's determined by either having that extra chromosome or not havin it.

How do you remember enzymes lower activation energy

And for this question ,

Aphids are insects that feed by inserting needle like mouthparts into the vascular tissue of plants. When the body of the insect is cut off leaving the mouthparts in place droplets of vascular fluid are forced out of the mouthparts. The aphid feeds on:
A the xylem where the fluid is under positive pressure
B  the phloem where the fluid is under negative pressure
C the xylem where the fluid is under negative pressure
D the phloem where the fluid is under positive pressure

Would it be c?
And
The fluid would contain:
A water and high levels of carbon dioxide
B water amino acids and sugars
C aphid faeces (wastes)
D water and mineral ions

Water and mineral ions right??
Enzymes make it easier for the reaction to occur, the activation energy is how much energy is needed for the reaction to occur. If you need less energy to do something, it'll be easier to do.

Nope it's D. (although aphids do also drink from xylem). You can work out the answer is D because it says that the fluid flows out of the tree - this means it's under positive pressure. The phloem in under positive pressure and the xylem is under negative pressure so it must be d.

It would be B.

For this question:

How do guard cells regulate the closing of stomata
A Guard cells lose k+ions, lose water and decrease turgor pressure
B guard cell turgor pressure decreases due to increased air pressure inside air spaces
C guard cell turgor pressure increases due to increased air pressure inside air spaces
D guard cells gain k+ions gain water and increase turgor pressure

Would it be a ??
Yep it's A.

What is the difference between 'the number of notifications per 100,000' and 'the number of cases' with regards to vaccine programs? Which is better?
The number notifications per 100,000 is better because it's more accurate. The number of cases can't be measured very well because not everyone who is infected will be tested (whereas the number of notifications is just a measure of how many cases are reported so it is actually measureable). Measuring per 100,000 is better than total cases because it allows for a comparison between groups of different sizes - you couldn't directly compare the number of cases in a population of 10,000 before vaccination to the number in a population of 23,000 after vaccination, but you can if you record the number per 100,000 population

Which came first the chicken or the egg

Do crossing over, Independent assortment and random segregation all occur in meiosis 1
An egg containing a chicken came first, and egg laid by a chicken came later. cool video

Yes they all occur in meiosis one, however random segregation also occurs in meiosis 2.
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