Yacoubb's Bio 3+4 Questions

[no steez]

I know salt or ions cannot pass the plasma membrane by themselves. But can salt pass through the cell wall?
Can someone quickly run me through the cell wall and sodium chloride?
thanks

[pi]

You just need to state "relative to the intracellular fluid present in the plant cell." I wrote that down all the time in my SAC.

This.

Detail to make it non-ambiguous is important.

[Bad Student]

I know salt or ions cannot pass the plasma membrane by themselves. But can salt pass through the cell wall?
Can someone quickly run me through the cell wall and sodium chloride?
thanks

The cell wall isn't semi-permeable, its pretty much permeable to everything.

[Yacoubb]

Hey guys

Just a quick question. I was doing a LisaChem diagnostic test and I was stumped by these questions.

- Name the two major organic components that make up a molecule of ATP.
*I wrote Carbohydrates and Nucleic Acids, but I'm pretty sure that's wrong.

- Which particular group of molecules within ATP is considered biologically important of ATP? Explain.

I really didn't know how to approach these questions. Help would be really appreciated. Thank you

[psyxwar]

Hey guys

Just a quick question. I was doing a LisaChem diagnostic test and I was stumped by these questions.

- Name the two major organic components that make up a molecule of ATP.
*I wrote Carbohydrates and Nucleic Acids, but I'm pretty sure that's wrong.

- Which particular group of molecules within ATP is considered biologically important of ATP? Explain.

I really didn't know how to approach these questions. Help would be really appreciated. Thank you

Organic components...? All I can really think of is the sugar component (in this case the purine) and the nitrogenous base.

The second one is the phosphate group, because when removed causes the release of energy that is able to drive metabolism and is also involved in pathways involving phosphorylation (for example, many signal transduction pathways)

[Yacoubb]

Organic components...? All I can really think of is the sugar component (in this case the purine) and the nitrogenous base.

The second one is the phosphate group, because when removed causes the release of energy that is able to drive metabolism and is also involved in pathways involving phosphorylation (for example, many signal transduction pathways)

Yeah thats what I thought

Hydrolysis of the terminal phosphate group of the ATP molecule releases ample energy, which is then used by endergonic reactions that require this energy input. Its that energy rich bond between the second + third (terminal) phosphate group that makes ATP such a high-energy molecule.

[Yacoubb]

I've begun Chapter 7 of Nature of Biology 2, and I don't know if its me or the study design says very little about what types of pathogens we need to know.

I've learnt about Prions, Viruses, Viroids, Bacteria and very generally about eukaryotic pathogens, and how pathogens can be classified as cellular or non-cellular. Would that be sufficient? I mean how much do we need to delve into pathogenic agents for the VCE Biology course??

Thanks for your help.

[AbominableMowman]

I've begun Chapter 7 of Nature of Biology 2, and I don't know if its me or the study design says very little about what types of pathogens we need to know.

I've learnt about Prions, Viruses, Viroids, Bacteria and very generally about eukaryotic pathogens, and how pathogens can be classified as cellular or non-cellular. Would that be sufficient? I mean how much do we need to delve into pathogenic agents for the VCE Biology course??

Thanks for your help.

I think its enough to know generally about prions, viruses, etc. (in as much detail as there is in the book) but in more detail about cellular and eukaryotic pathogens (in my opinion) because when I was doing Unit 3 exams I saw more questions about eukaryotic pathogens (e.g. there was a question about hyphae of fungi). Usually when they're asking about pathogens though theres a passage beforehand about the specific organism/pathogenic agent.

[Irving4Prez]

I was doing Unit 3 exams I saw more questions about eukaryotic pathogens (e.g. there was a question about hyphae of fungi).

Came across this question as well,

Q. Histoplasmosis is an infectious disease of the lungs caused by the soil-based fungus Histoplasma capsulatum The H. capsulatum is most likely to be

A. Killed by antibiotics
B. A prokaryotic organism
C. Only able to grow in a dry, cool environment
D. Made of thread-like filaments known as hyphae

Although you can eliminate A and B straight off, you can't derive the answer from the sentence provided. I'm assuming we need to have little knowledge of the structure of fungi.

[AbominableMowman]

Came across this question as well,

Q. Histoplasmosis is an infectious disease of the lungs caused by the soil-based fungus Histoplasma capsulatum The H. capsulatum is most likely to be

A. Killed by antibiotics
B. A prokaryotic organism
C. Only able to grow in a dry, cool environment
D. Made of thread-like filaments known as hyphae

Although you can eliminate A and B straight off, you can't derive the answer from the sentence provided. I'm assuming we need to have little knowledge of the structure of fungi.

YEAH! that's the exact one..  I was confused as to C or D but then I realised that fungi would most likely grow in damp environments not dry ones so I picked D. But knowledge of fungi would have definitely helped...

[alondouek]

D is correct!

C can be eliminated by logic - if the fungus is 'soil-based', it's unlikely that it will be in a dry environment. So, AbominableMowman, your reasoning was correct.

Moreover, D is certainly correct as hyphae are the main mode of vegetative growth of a fungus, and they're pretty much universal in the fungi kingdom. (Side note: yeasts do not grow as hyphae, even though they are fungal in nature)

[Yacoubb]

Is this an appropriate definition for a target cell:

A target cell is a specific type of cell that has appropriate receptors, enabling these cells to be identified by specific signalling molecules and thus respond to these signalling molecules.

I'm really hesitant about using 'hormone' because neurotransmitters are also signalling molecules and their target cells would be either the next neuron (dendrites of the next neuron) or the effector muscle/gland.

Help would be appreciated

Thanks!

[simpak]

Signalling molecule is definitely a good word to use.  I think your definition is good, although I must admit I got a little confused about the 'identified by' which might just be because I have been studying cell markers for the last 24 hours or maybe because you're personifying the signalling molecule.
My VCE Biology definition probably went a little like this:

A specific type of cell that possesses a particular receptor allowing it to bind and respond to specific signalling molecules.

A bit shorter and a little more concise but feel free to keep yours if you wish!

[Yacoubb]

Signalling molecule is definitely a good word to use.  I think your definition is good, although I must admit I got a little confused about the 'identified by' which might just be because I have been studying cell markers for the last 24 hours or maybe because you're personifying the signalling molecule.
My VCE Biology definition probably went a little like this:

A specific type of cell that possesses a particular receptor allowing it to bind and respond to specific signalling molecules.

A bit shorter and a little more concise but feel free to keep yours if you wish!

This is perfect. Thank you so much!!

[Yacoubb]

Would it be accurate to say that natural killer cells induce apoptosis in viral-infected cells??