VCE Biology Question Thread

[Gogo14]

1. Many seeds need to be soaked before they germinate. The plant regulator that is removed is:
Gibberellin, abiscic acid, auxins, ethylene
Ans: abisic acid. Why?I put gibberellin
2. Components that contribute to the inflammatory response is:
Mast cells, IgE, T helper cells, macrophages
Ans: mast cells. But aren't macrophages also involved?

[vox nihili]

1. Many seeds need to be soaked before they germinate. The plant regulator that is removed is:
Gibberellin, abiscic acid, auxins, ethylene
Ans: abisic acid. Why?I put gibberellin
2. Components that contribute to the inflammatory response is:
Mast cells, IgE, T helper cells, macrophages
Ans: mast cells. But aren't macrophages also involved?

All of them are involved in inflammation. If that's the question and answer verbatim, it's total bullshit

[solution]

1. Many seeds need to be soaked before they germinate. The plant regulator that is removed is:
Gibberellin, abiscic acid, auxins, ethylene
Ans: abisic acid. Why?I put gibberellin
2. Components that contribute to the inflammatory response is:
Mast cells, IgE, T helper cells, macrophages
Ans: mast cells. But aren't macrophages also involved?

Abscisic acid acts as an inhibitor and stimulates dormancy of seeds. On the other hand, gibberlin helps cell division and elongation of plant shoots.

[solution]

Just curious, where is everybody up to in the course so far?

[larissaaa_]

Praying someone can answer this before my SAC tomorrow:
Can someone please tell me everything I need to know about fluorescent in situ hybridisation at the vce level? Like any tips on interpreting it or is it all straightforward?

[Gogo14]

All of them are involved in inflammation. If that's the question and answer verbatim, it's total bullshit

oh lol

Abscisic acid acts as an inhibitor and stimulates dormancy of seeds. On the other hand, gibberlin helps cell division and elongation of plant shoots.

makes sense. does abscisic acid get removed ONLY in water? I don't remember my teacher mentioning anything about abscisic acid in relation to water.

[larissaaa_]

One of the questions on my sac asked why amniocentesis is required before using the FISH technique and I absolutely fluked it but now I can't stop thinking about it and if I got the answer right (which I'm sure I didn't). Does anyone know?

[gameboy99]

If alleles in population is lost does that mean the allele frequency has been reduced??

[anotherworld2b]

I was wondering whats the difference between a mutagen and teratogen?

[Apink!]

Hello,

For this question

Hominid evolution shows that development in physical characteristics did not all occur at the same time. Evidence from fossil record suggest that

A. The S-shaped vertebral column occurred fore the development of the sloping forehead
B. The sloping forehead occurred before the development of the flatter face
C. Teeth reduced in size before the development of the flatter face
D. Teeth reduced in size before the development of the S-shaped vertebral column

I think both B and C is right.  Looking at the picture I attached, you can see that teeth has gotten smaller along the skulls in the top row without flattening of the face. (So C is right). You can also see that the sloping forehead occurs in the top row and then flattening of the face occurs (so B is right) But the answer says that only B is right... Why not C?

EDIT: Attached! Soz

[Gogo14]

Just some things I would like someone to confirm:
1. DNA is unwound by RNA polymerase in transcription whereas it is unwound by helicase in DNA replication right?
2. can you refer to the 2 strands in DNA as coding or template strands for transcription and DNA replication questions?

[vox nihili]

Hello,

For this question

Hominid evolution shows that development in physical characteristics did not all occur at the same time. Evidence from fossil record suggest that

A. The S-shaped vertebral column occurred fore the development of the sloping forehead
B. The sloping forehead occurred before the development of the flatter face
C. Teeth reduced in size before the development of the flatter face
D. Teeth reduced in size before the development of the S-shaped vertebral column

I think both B and C is right.  Looking at the picture I attached, you can see that teeth has gotten smaller along the skulls in the top row without flattening of the face. (So C is right). You can also see that the sloping forehead occurs in the top row and then flattening of the face occurs (so B is right) But the answer says that only B is right... Why not C?

You haven't attached a picture

Just some things I would like someone to confirm:
1. DNA is unwound by RNA polymerase in transcription whereas it is unwound by helicase in DNA replication right?
2. can you refer to the 2 strands in DNA as coding or template strands for transcription and DNA replication questions?

1. In the VCE world yes, but in the real world there's actually a helicase (called TFIIH)
2. Yes

[gameboy99]

How can a population go extinct? (excluding the possibility of genetic drift wiping out the whole population)
Could someone please answer this?
Thanks 

[Sine]

How can a population go extinct? (excluding the possibility of genetic drift wiping out the whole population)
Could someone please answer this?
Thanks 

Genetic drift won't wipe out the entire population it is the change in allele frequency due to chance.

Extinction will be happen when not enough genetic variation exists as then the whole population may have an unfavorable trait therefore those with a favorable trait are unable to reproduce (as none of them exist) therefore allele frequencies don't change and this may result in extinction. However this take such a long time without human intervention i.e hunting.

[yakattack]

2. Components that contribute to the inflammatory response is:
Mast cells, IgE, T helper cells, macrophages
Ans: mast cells. But aren't macrophages also involved?

All of them are involved in inflammation. If that's the question and answer verbatim, it's total bullshit

All are involved (as you say), but isn't it only mast cells (out of the options) that contribute to inflammation directly? I could be completely wrong, but I thought I may as well ask for my own clarification