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March 29, 2024, 03:37:02 am

Author Topic: VCE Biology Question Thread  (Read 3570703 times)  Share 

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simpak

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Re: VCE Biology Question Thread
« Reply #1785 on: May 27, 2014, 09:14:22 pm »
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They are different cells.  Basophils usually move through the circulation whereas mast cells are localised to the tissues.  They have similar functions and coordinate similar responses :)
Mast cells usually act earlier in the response (eg allergic response) because they're localised to the tissue.  They can recruit basophils to the site from the circulation.
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Reus

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Re: VCE Biology Question Thread
« Reply #1786 on: May 27, 2014, 10:14:45 pm »
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They are different cells.  Basophils usually move through the circulation whereas mast cells are localised to the tissues.  They have similar functions and coordinate similar responses :)
Mast cells usually act earlier in the response (eg allergic response) because they're localised to the tissue.  They can recruit basophils to the site from the circulation.
Thanks for that! Another inquiry, what would immunisation and vaccination fall under? What level of defence?
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simpak

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Re: VCE Biology Question Thread
« Reply #1787 on: May 27, 2014, 11:20:33 pm »
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Third line of defence - they rely on either the provision of a specific adaptive response or the generation of an adaptive response with memory; not permitted by the innate systems in 1st and 2nd line.
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katiesaliba

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Re: VCE Biology Question Thread
« Reply #1788 on: May 29, 2014, 09:32:43 am »
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What's the difference between 'self' molecules and MHC markers- are they the same thing?


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Vicbelgaus

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Re: VCE Biology Question Thread
« Reply #1789 on: May 29, 2014, 10:24:53 am »
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katiesaliba when you mention ''self molecules'' are you referring to the antigens present on our bodies cells?

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Frozone

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Re: VCE Biology Question Thread
« Reply #1790 on: May 29, 2014, 12:21:02 pm »
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Do we have to know about MHC Markers?
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katiesaliba

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Re: VCE Biology Question Thread
« Reply #1791 on: May 29, 2014, 01:42:53 pm »
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katiesaliba when you mention ''self molecules'' are you referring to the antigens present on our bodies cells?
Aren't antigens any molecule that cause an immune response? Therefore, why would antigens be present on our body cells? I'm so confused about this concept. What is the difference between self-molecules, MHC markers and antigens present in the body?  :o
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soNasty

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Re: VCE Biology Question Thread
« Reply #1792 on: May 29, 2014, 04:06:37 pm »
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When non-specific macrophages engulf a pathogen and destroy it (via the lysosome), they present antigenic fragments on their surface, complexed with MHC class II molecules ('non-self'). This allows cells of the adaptive immune system (i.e. lymphocytes) to generate a specific response against that particular antigenic determinant (the part of an antigen molecule to which an antibody attaches itself). Infected body cells (e.g. viruses and tumors) may present antigenic fragments on MHC class I molecules, denoting that the cell is now compromised and needs to be destroyed.

katiesaliba

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Re: VCE Biology Question Thread
« Reply #1793 on: May 29, 2014, 04:38:54 pm »
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So MHC markers and 'self' molecules are the same thing?
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howlingwisdom

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Re: VCE Biology Question Thread
« Reply #1794 on: May 29, 2014, 04:56:24 pm »
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So MHC markers and 'self' molecules are the same thing?
They are somewhat related but MHC are markers that carry/present antigens.
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chekside

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Re: VCE Biology Question Thread
« Reply #1795 on: May 29, 2014, 05:44:55 pm »
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Does auxin have the same affect on roots as it does on shoots? I know that auxin in roots promotes positive geotropism, so that would indicate that it would accumulate on the lower side of the root.

katie101

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Re: VCE Biology Question Thread
« Reply #1796 on: May 29, 2014, 06:06:41 pm »
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Why is penicillin effective against Gram-positive bacteria in particular?

Thanks :)

nhmn0301

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Re: VCE Biology Question Thread
« Reply #1797 on: May 29, 2014, 08:25:51 pm »
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So MHC markers and 'self' molecules are the same thing?
MHC is the abbreviation form of Major Histocompatibility Complex: these are GENES which code for plasma membranes protein that stick out of the cell surface. Markers are plasma membrane proteins coded by MHC. All cells will have markers.
Does auxin have the same affect on roots as it does on shoots? I know that auxin in roots promotes positive geotropism, so that would indicate that it would accumulate on the lower side of the root.
Yes, but as far as I'm aware, different concentration of Auxin in plants when compare to Cytokine will produce different response. Moreover, an organelle in plants called Amyloplasts which specialised for storing starch can be said to be responsible for positive geotropism. The position of amyloplast control the movement of hormones which eventually causes the upper side of a cell outgrow the underside => the roots bend downward.
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katiesaliba

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Re: VCE Biology Question Thread
« Reply #1798 on: May 29, 2014, 10:39:34 pm »
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MHC is the abbreviation form of Major Histocompatibility Complex: these are GENES which code for plasma membranes protein that stick out of the cell surface. Markers are plasma membrane proteins coded by MHC. All cells will have markers.

The major histocompatibility complex (MHC) codes for MHC markers, which are protein molecules that can be classified as either class I or class II markers. Surely 'self' cells are identifiable by MHC class I markers and 'non-self' molecules are determined by antigens presented by MHC markers?  :-\
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nhmn0301

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Re: VCE Biology Question Thread
« Reply #1799 on: May 29, 2014, 10:44:15 pm »
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The major histocompatibility complex (MHC) codes for MHC markers, which are protein molecules that can be classified as either class I or class II markers. Surely 'self' cells are identifiable by MHC class I markers and 'non-self' molecules are determined by antigens presented by MHC markers?  :-\
Yup, you're right. Just a bit of clarification. Sorry for any confusions!
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