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    HSC Biology Marathon 2017

    Haven't seen many people that do bio on this forum but anyway post questions.

    First question:
    (This is just a made up question)
    Describe the mechanism of feedback with the use of ONE positive feedback mechanism in humans. (3 marks)


    Hint:
    2 marks for the description of feedback and one for the example
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    Re: HSC Biology Marathon 2017

    A feedback mechanism is a process of altering the stimulus by bringing up the change through the effectors which then create a response or a feedback. These feedbacks can be either positive which enhance the effects of the original stimulus, or they can be negative which reduce the affect of the original stimulus. An example of a positive feedback is the release of Oxytocin from by contractions during child birth causing more contractions.
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    Re: HSC Biology Marathon 2017

    Next Question:
    Screenshot 2016-09-26 at 21.26.04.png

    *I actually need help in this question
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    Re: HSC Biology Marathon 2017

    Quote Originally Posted by Rathin View Post
    Next Question:
    Screenshot 2016-09-26 at 21.26.04.png

    *I actually need help in this question
    Pretty sure it's D because the A and B get joined, which is an example of a reaction catalysed by enzymes (joining two substrates into one).
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    Re: HSC Biology Marathon 2017

    Quote Originally Posted by Rathin View Post
    Next Question:
    Screenshot 2016-09-26 at 21.26.04.png

    *I actually need help in this question
    The answer is D
    The reason why it's not A) is because it is the Enzyme. B) Is the whole process C) The product

    -
    What are the role of Enzymes? (1 mark)

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    Re: HSC Biology Marathon 2017

    Quote Originally Posted by sourmilk View Post
    The answer is D
    The reason why it's not A) is because it is the Enzyme. B) Is the whole process C) The product

    -
    What are the role of Enzymes? (1 mark)
    Enzymes are biological catalysts that speed up metabolic processes in cells and organisms. They are responsible for assisting with homeostasis in an organism in maintaining a stable state despite environmental changes.
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    Re: HSC Biology Marathon 2017

    Enzymes are biological catalysts which increase the the rate of chemical reactions in living organisms and decrease the activation energy. This makes the metabolism in organisms efficient.
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    Re: HSC Biology Marathon 2017

    Quote Originally Posted by sourmilk View Post
    The answer is D
    The reason why it's not A) is because it is the Enzyme. B) Is the whole process C) The product

    -
    What are the role of Enzymes? (1 mark)
    I thought C was the substrate?
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    Re: HSC Biology Marathon 2017

    Quote Originally Posted by Rathin View Post
    I thought C was the substrate?
    No, that is the product formed from the enzyme reacting with the substrate.
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    Re: HSC Biology Marathon 2017

    Quote Originally Posted by pikachu975 View Post
    No, that is the product formed from the enzyme reacting with the substrate.
    What would be the enzyme then?
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    Re: HSC Biology Marathon 2017

    Quote Originally Posted by Rathin View Post
    What would be the enzyme then?
    The enzyme is (A), which is the C thing in the diagram. This is because it is reacting with the TWO substrates to form one product.
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    Re: HSC Biology Marathon 2017

    Name one Australian endotherm and one Australian ectotherm and describe how they respond to temperature changes and regulate their own body temperature. (8 marks)

    You don't need to write out the whole response, just give an outline:
    e.g. Two animals - animal 1, animal 2
    Animal 1 - adaptation, adaptation, adaptation

    etc
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    Re: HSC Biology Marathon 2017

    ^Haven't got up that that yet..will try to learn it tomorrow and answer it
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    Re: HSC Biology Marathon 2017

    Quote Originally Posted by Rathin View Post
    ^Haven't got up that that yet..will try to learn it tomorrow and answer it
    Well just for reference, the examples I've got are kangaroos for endotherm and frill neck lizard for ectotherm.
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    Re: HSC Biology Marathon 2017

    Quote Originally Posted by pikachu975 View Post
    Name one Australian endotherm and one Australian ectotherm and describe how they respond to temperature changes and regulate their own body temperature. (8 marks)

    You don't need to write out the whole response, just give an outline:
    e.g. Two animals - animal 1, animal 2
    Animal 1 - adaptation, adaptation, adaptation

    etc
    Endotherms are organisms that regulate their own internal temperature and are independent from the ambient temperature. Ectotherm organisms who's internal temperature is dependent on the ambient temperature. An Endotherm regulates the body temperature through the process of homoeostasis while an Ectotherm needs to seek other methods. They both have many physiological and behavioural adaptions which help them maintain this temperature. An example of an Endothermic organism is a Bare Nosed Wombats. These organisms have many behavioural adaptions to respond to increasing temperature in their body such as; burrowing underground to avoid heat, active at night instead of the day to avoid heat from the sun, and soaking themselves with water to cool down. They also have many physiological adaptions to cool down such as; lowering the metabolism to conserve energy and heat and vasodilation. To respond to decreasing temperatures in their body they also have many behavioural adaptions such as; burrowing underground to avoid the cold, and many physiological adaptions such as; vasoconstriction. An example of an Exothermic organism is the Australian Barking Gecko. Ectotherms mainly have behavioural adaptions to temperature changes. These organism have many behavioural adaptions to respond to increasing temperature in their body such as; lifting their body off the hot ground to reduce surface area exposed to the ground, seeks shade, and becomes active at night. To respond to decreasing temperatures in their body they also have many behavioural adaptions such as; basking in the sun to absorb heat and flattening their body on the ground to increase surface are to get more heat from the ground and the sun.

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    Re: HSC Biology Marathon 2017

    Explain why importance of homeostasis is important for optimal metabolic efficiency? (4 marks)
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    Re: HSC Biology Marathon 2017

    Quote Originally Posted by Rathin View Post
    Explain why importance of homeostasis is important for optimal metabolic efficiency? (4 marks)
    Homeostasis is the maintaining of a relatively stable internal environment within an organism. It is essential for metabolic efficiency because metabolic processes are catalysed by enzymes, which function optimally in narrow environmental conditions and are vastly affected by factors such as temperature, pH and substrate concentration. Each enzyme has its own optimal temperature range, and if the temperature gets too high, reactions can occur too rapidly and lead to the polypeptide chains to break, denaturing and killing the enzyme. If the temperatures get too low, the enzyme can freeze and reactions occur much slower, meaning metabolic efficiency is at a low level. Furthermore, the pH of an area containing enzymes can affect it because if it gets too acidic or too basic, then the enzyme can get denatured and stop functioning, hence slowing down metabolic processes. The substrate concentration is essential for metabolic efficiency because the more substrates there are, then the more chance an enzyme will react with one. If every enzyme is working at maximum capacity, then metabolism is occurring at its maximum potential. All of these factors show the importance of homeostasis because if a constant internal environment is not maintained, then enzymes will not run efficiently and can even die, leading to a low metabolic efficiency.
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    Re: HSC Biology Marathon 2017

    Quote Originally Posted by Rathin View Post
    Endotherms are organisms that regulate their own internal temperature and are independent from the ambient temperature. Ectotherm organisms who's internal temperature is dependent on the ambient temperature. An Endotherm regulates the body temperature through the process of homoeostasis while an Ectotherm needs to seek other methods. They both have many physiological and behavioural adaptions which help them maintain this temperature. An example of an Endothermic organism is a Bare Nosed Wombats. These organisms have many behavioural adaptions to respond to increasing temperature in their body such as; burrowing underground to avoid heat, active at night instead of the day to avoid heat from the sun, and soaking themselves with water to cool down. They also have many physiological adaptions to cool down such as; lowering the metabolism to conserve energy and heat and vasodilation. To respond to decreasing temperatures in their body they also have many behavioural adaptions such as; burrowing underground to avoid the cold, and many physiological adaptions such as; vasoconstriction. An example of an Exothermic organism is the Australian Barking Gecko. Ectotherms mainly have behavioural adaptions to temperature changes. These organism have many behavioural adaptions to respond to increasing temperature in their body such as; lifting their body off the hot ground to reduce surface area exposed to the ground, seeks shade, and becomes active at night. To respond to decreasing temperatures in their body they also have many behavioural adaptions such as; basking in the sun to absorb heat and flattening their body on the ground to increase surface are to get more heat from the ground and the sun.
    Also maybe a concluding sentence to sum it all up could help. E.g. "Therefore, it is evident that both endotherms and ectotherms have their respective behavioural and physiological adaptations in responding to changes in temperature and regulating their own body heat". or something to finish it off.
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    Re: HSC Biology Marathon 2017

    Quote Originally Posted by pikachu975 View Post
    Haven't seen many people that do bio on this forum but anyway post questions.

    First question:
    (This is just a made up question)
    Describe the mechanism of feedback with the use of ONE positive feedback mechanism in humans. (3 marks)


    Hint:
    2 marks for the description of feedback and one for the example
    I'm pretty sure we only need to know negative feedback
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    Re: HSC Biology Marathon 2017

    All questions so far seem to have been answered, so I'll throw another question in, if no one minds:

    Describe the main changes in blood composition as it travels around the body and identify the tissues in which these changes occur. (5 marks ?) Not sure how much this would be worth o:

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    Re: HSC Biology Marathon 2017

    Quote Originally Posted by Incandescence View Post
    All questions so far seem to have been answered, so I'll throw another question in, if no one minds:

    Describe the main changes in blood composition as it travels around the body and identify the tissues in which these changes occur. (5 marks ?) Not sure how much this would be worth o:
    Blood moves the body around in two pathways knows as pulmonary circuit and systemic circuit. The pulmonary circuit is a circuit of blood between the lungs and the heart, so as the blood flows to the lungs there will a decrease in carbon dioxide and an increase in oxygen in the blood composition as these gases are diffused in the alveoli. The systemic circuit consists of a circulation of blood from the heart to all other body cells and organs. As the blood goes to body tissues there will be a decrease in oxygen and an increase in carbon dioxide in the blood composition as the tissues require oxygen and the waste product which is the carbon dioxide is diffused into the blood. As the blood circulates to the liver there will be a decrease in nutrients such as glucose and an increase in nitrogenous wastes in the blood as liver requires alot of energy due to high metabolic activity and diffuses the detoxified nitrogenous wastes into the blood. As the blood goes to the kidney there will be a decrease in Nitrogenous wastes from the blood and into the kidney which turns it into urea and is removed through urination. As the blood goes to the small intestine there will be a decrease in nutrients such as glucose and an increase in products of digestion in the blood stream as high amounts of energy is required in the small intestine as it has a function of digesting and absorbing food and as a result the products of digestion are diffused into the blood. As the blood circulates to the large intestine there will be an decrease in nutrients such as glucose and an increase in water salts in the blood composition as it has a function to absorb water from indigestible foods so it requires alot of energy to do so, thus the increase in salts and water in the blood and decrease in nutrients from the blood.
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    Re: HSC Biology Marathon 2017

    Identify some responses of plants to temperature change. (4 marks)
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    Re: HSC Biology Marathon 2017

    Quote Originally Posted by Rathin View Post
    Identify some responses of plants to temperature change. (4 marks)
    Phototaxis
    One response to temperature change is the use of phototaxis, where plants bend their leaves according to where the sun is shining from. This is used to either gain more sunlight absorption due to increased surface area being exposed, or to minimise the sunlight being received.

    Smaller Leaves
    Smaller leaves is a response by plants so that they have less surface area exposed to sunlight, this means that they absorb less of it. The effect of this is that less water is lost through the stomates, increasing water conservation.

    Eucalypt
    The Australian Eucalypt is an example of a plant that survives Australia's harsh arid conditions. This is through hanging its leaves vertically, so that during midday when the sun is at its hottest, the leaves are not that exposed, increasing water conservation. The leaves are mainly exposed during sunrise and sunset, when the sun is at its coolest, compared to midday. Furthermore, some Eucalypts even close their stomates during the extremely hot and dry temperatures so that transpiration does not occur, because very hot temperatures rapidly increases the rate of water loss.
    Last edited by pikachu975; 1 Oct 2016 at 2:25 PM.
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    Re: HSC Biology Marathon 2017

    Discuss two ways in which plants can respond to an increase in temperature. (4 marks)
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    Re: HSC Biology Marathon 2017

    2009 HSC Q23

    A woman recently conceived Britain’s first baby guaranteed to be free
    from hereditary breast cancer. Doctors screened for an embryo that was
    free from a gene that can cause breast cancer.
    The screening was performed due to the long history of this form of
    cancer in the family and the fact that any daughter born with the gene
    would have a 50%–80% chance of developing breast cancer.

    Explain the possible impact of this reproductive technology on the genetic
    composition of the population. (2 marks)


    The answers just say "This reproductive technology" wouldn't you need to specify the technology? What's the reproductive technology here anyway...
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