Login

Welcome, Guest. Please login or register.

March 29, 2024, 12:38:06 pm

Author Topic: VCE Biology Question Thread  (Read 3571167 times)  Share 

0 Members and 7 Guests are viewing this topic.

Lymphhh

  • Adventurer
  • *
  • Posts: 6
  • Respect: +1
Re: VCE Biology Question Thread
« Reply #13710 on: September 29, 2021, 08:44:58 pm »
+2
Hi everyone, could someone help me explain this graph. Is it like the more carbon dixoxide present the more effect on light intensity. If someone could explain it would help. thanks

The light intensity is on the horizontal axis (independant variable) while the photosynthetic rate is on vertical axis (dependant variable). So it’s looking at the effect of increasing light intensity on the rate of photosynthesis. The general trend is that as light intensity increases, rate of photosynthesis increases. This is because light energy is a requirement for the light dependent stage of photosynthesis.
Option A is incorrect because it is not that photosynthesis is no longer occuring but its rather remaining constant. The reason why the graph plateaus is because a requriemnt for photosynthesis other than light has become a limiting factor (eg: CO2).

Hope this helps.


« Last Edit: September 30, 2021, 12:06:20 pm by Lymphhh »
VCE :
2020: LOTE [40]
2021: Biology 3/4 [39 ]
2022: Chem [ ], English [ ], Physics [ ], Maths Meth [ ]

M-D

  • Victorian
  • Forum Obsessive
  • ***
  • Posts: 227
  • Respect: 0
Re: VCE Biology Question Thread
« Reply #13711 on: September 30, 2021, 06:54:35 am »
0
Hi,
Could someone please shed some light on VCAA 2008 Exam 1 MCQ 6 given below:
Thanks

wingdings2791

  • Trendsetter
  • **
  • Posts: 117
  • I'm going back to the start
  • Respect: +108
Re: VCE Biology Question Thread
« Reply #13712 on: September 30, 2021, 09:51:01 am »
+6
Hi,
Could someone please shed some light on VCAA 2008 Exam 1 MCQ 6 given below:
Thanks

Hey M-D,
I'm not sure which part you'd like clarification on, but start with the rate of oxygen that corresponds to a light intensity of 10. The y axis relates to the change in the rate of net oxygen production, but I see how the two different axis labels could be confusing. You could think of the graph this way:


When the rate of net oxygen production is negative, there must be a net consumption of oxygen, and vice versa for a positive rate. At a light intensity of 10, the rate of net oxygen production is 0; the amount of oxygen is constant. You know that there are two cellular processes undertaken by plants; one producing oxygen and one consuming oxygen. The question asks, what kind of balance exists between these two cellular processes to total a net oxygen production of 0?

Hope this helps :)
ATAR: 99.75
UCAT: 95th

2022-2025: B. Radiography and Medical Imaging (Honours) @ Monash

M-D

  • Victorian
  • Forum Obsessive
  • ***
  • Posts: 227
  • Respect: 0
Re: VCE Biology Question Thread
« Reply #13713 on: October 01, 2021, 06:31:49 am »
+1
Thank you @wingdings2791. That helped.

Acegtr

  • Adventurer
  • *
  • Posts: 16
  • Respect: 0
Re: VCE Biology Question Thread
« Reply #13714 on: October 02, 2021, 08:49:00 am »
0
Hi, Can ADP be used as an energy source? If yes, could someone provide an example? If not, could someone please explain why? My thinking of why it can't is because once one of the Phosphates leaves, the bond between the remaining phosphates is much stronger, and therefore, it can't be broken to produce energy. Any clarification would be appreciated!

biology1234

  • Forum Regular
  • **
  • Posts: 84
  • Respect: 0
Re: VCE Biology Question Thread
« Reply #13715 on: October 10, 2021, 11:50:52 am »
0
I have understood the process from in which  a zygote turns into morula, then blastocyst and then the 3 germ layers. I wanted to clarify is this what the stem cells become. Or are they different. The process in which I described above is that just embryonic stem development. Could someone explain. Thank you

KKKKKKKK

  • Fresh Poster
  • *
  • Posts: 2
  • Respect: 0
Re: VCE Biology Question Thread
« Reply #13716 on: October 10, 2021, 09:23:13 pm »
0
Hello, what is a gene loci?

K.Smithy

  • QLD MVP - 2019
  • QCE Moderator
  • Forum Obsessive
  • *****
  • Posts: 400
  • "We are the cosmos made conscious." B.C. (she/her)
  • Respect: +396
Re: VCE Biology Question Thread
« Reply #13717 on: October 10, 2021, 10:35:54 pm »
+3
Hello, what is a gene loci?

It is the position on a chromosome where you would be able to find a particular gene.
QCE 2020: Physics (92) || Psychology (96) || Biology (93) || Methods (79) || English (98) || SOR (91)
ATAR: 98.40
2021-2024: Bachelor of Advanced Science (Honours) @ UQ

Uni Journal ; U3 Bio ; U3 Psych ; U3 Physics

KKKKKKKK

  • Fresh Poster
  • *
  • Posts: 2
  • Respect: 0
Re: VCE Biology Question Thread
« Reply #13718 on: October 10, 2021, 11:43:16 pm »
0
It is the position on a chromosome where you would be able to find a particular gene.

Thankyou @K.Smithy

biology1234

  • Forum Regular
  • **
  • Posts: 84
  • Respect: 0
Re: VCE Biology Question Thread
« Reply #13719 on: October 11, 2021, 06:09:23 pm »
0
A normal womans chromosomes are homologous. Is the same true for a normal male?

Would it be no, as the male has a x and a  y chromsone whereas female has two x chromsones



It is the position on a chromosome where you would be able to find a particular gene.


In relation to this question, since the gene locus is on the x -chromosone. Does this affect its inheritance patterns

mod edit: merged double post ~Owlbird83
« Last Edit: October 11, 2021, 09:14:20 pm by Owlbird83 »

Billuminati

  • Science Games: Gold
  • Forum Obsessive
  • ***
  • Posts: 300
  • Respect: +127
Re: VCE Biology Question Thread
« Reply #13720 on: October 12, 2021, 03:03:34 am »
+6
A normal womans chromosomes are homologous. Is the same true for a normal male?

Would it be no, as the male has a x and a  y chromsone whereas female has two x chromsones




In relation to this question, since the gene locus is on the x -chromosone. Does this affect its inheritance patterns

mod edit: merged double post ~Owlbird83

Women can be homozygotes or heterozygotes for a particular trait, however males are only hemizygous. With regards to whether or not the X and Y chromosomes are homologous, the answer is yes and no. There are 2 sections in the p arm telomere and q arm telomere of both the X and Y chromosomes called pseudoautosomal regions that actually cross over during meiosis, despite the X and Y chromosomes having very different shapes. Note that for reasons still unknown, this does not occur in male fruit flies.

And yes, genes located on the X-chromosome (known as X-linked genes) have different phenotypic ratios compared to autosomal ones. X-linked recessive conditions disproportionately affect males, whereas X-linked dominant conditions disproportionately affect females, have a think about why by drawing a few Punnett squares
« Last Edit: October 12, 2021, 03:05:53 am by Billuminati »
VCE 2016-2018

2017: Biology [38], Further Maths [44]

2018: Methods [37], French [38], Chem [40], English [44]

UMAT: 56/43/80, 57th percentile (LLLLOOOOOOOOOLLLLLLLL)

ATAR: 98.1

2019-2021: Bachelor of Biomedical Science at Monash (Scholars), minoring in Chemistry

GAMSAT September 2021: 65/67/86, 76 overall (98th percentile)

2022: Chilling

2023+: Transfer to teaching degree

Chocolatepistachio

  • Science Games: Silver
  • Forum Obsessive
  • ***
  • Posts: 470
  • Respect: +51
Re: VCE Biology Question Thread
« Reply #13721 on: October 12, 2021, 09:24:53 pm »
0
if someone could help with this question

biology1234

  • Forum Regular
  • **
  • Posts: 84
  • Respect: 0
Re: VCE Biology Question Thread
« Reply #13722 on: October 13, 2021, 07:17:45 pm »
0
Explain why the cells of the gastrula are considered to be adult stem cells

Owlbird83

  • BLAA 2020
  • Moderator
  • Forum Leader
  • *****
  • Posts: 553
  • Respect: +785
Re: VCE Biology Question Thread
« Reply #13723 on: October 13, 2021, 08:30:02 pm »
+5
if someone could help with this question

I think A, B, C would represent the time when the population growth is not limited by the availability of resources as the population continues rising. However, maybe you could also argue it's only A and B, since in C the growth seems to be slowing down suggesting it's beginning to reach some resource limits. edit: i'm leaning to just A and B, let me know if you have a different opinion!

Explain why the cells of the gastrula are considered to be adult stem cells
To answer this question you might want to consider the characteristics of the different types of stem cells.
hint
Totipotent stem cells: can differentiate into all cell types in body and placenta
Pluripotent stem cells: can differentiate all the cell types in the body (aka embryonic stem cells)
Multipotent stem cells: can differentiate into only a couple of cell types (aka adult stem cells)

At the beginning of development we need stem cells that are able to differentiate into all different cell types, but once a certain stage of development is reached, this isn't necessary anymore, (therefore adult/multipotent stem cells only differentiate into a couple of cell types).

Spoiler
If the cells of the gastrula are considered adult stem cells it would be because they can differentiate into multiple (but not all) cell types
hope this helps!
« Last Edit: October 13, 2021, 08:38:19 pm by Owlbird83 »
2018: Biology
2019: Chemistry, Physics, Math Methods, English, Japanese
2020: Bachelor of Psychology (Monash)

Corey King

  • Trendsetter
  • **
  • Posts: 133
  • Respect: +3
Re: VCE Biology Question Thread
« Reply #13724 on: October 14, 2021, 02:22:58 pm »
0
Hey guys,
I was just wondering why, during anaerobic respiration, the body doesn't keep pyruvate and store it for later use. Why is it necessary to turn it into lactic acid / ethanol?
Thanks,
Corey