Yacoubb's Bio 3+4 Questions

[hardworker]

can someone please tell me why the pancreas has more rough endoplasmic reticulum and the liver more smooth endoplasmic reticulum? thanks in advance.

[Daenerys Targaryen]

Pancreas is where the insulin is made? Therefore more RoughER more proteins are made, more insulin to regulate blood (I assume)
And Liver needs SmoothER to package alcohol and stuff (i assume)

These are just guesses from organelle functions and organ functions

[alondouek]

Pancreas is where the insulin is made? Therefore more RoughER more proteins are made, more insulin to regulate blood (I assume)
And Liver needs SmoothER to package alcohol and stuff (i assume)

These are just guesses from organelle functions and organ functions

You're almost dead on!

Pancreatic cells are involved in the production of a number of hormones, such as insulin and glucagon - both of which are peptide hormones. Rough Endoplasmic Reticuli are 'dotted' with fixed ribosomes, which are involved in protein synthesis. Because pancreatic cells produce a greater range and amount of peptide-based molecules, more ribosomes (ergo more RERs) are required.

In liver cells, the Smooth Endoplasmic Reticuli contains enzymes that are essential to the detoxification of harmful drugs and metabolic by-products. For example, liver cells of an alcoholic would have a larger number of SERs so as to cope with the larger-than-normal intake of alcohol, which is a poison and needs to be detoxified and metabolised by the body.

[Daenerys Targaryen]

Haha yea! I'm surprised I can still do some of these questions!

[hardworker]

thanks haters gonna hate and alondouek.

[Yacoubb]

My first SAC is next week and I'd really appreciate if someone could please check if this aim, hypothesis and observations are valid and any possible changes I can make in order to achieve the best I possibly can.

Aim:
What you will be investigating – the aim of the experiment was to investigate Osmosis in a plant cell when placed in solutions with different solute concentrations.

Hypothesis:
The educated guess as to what will happen –
* When the cell is placed in the hypertonic solution, water will move out of the cell by osmosis and the cells will plazmolyse.
* When the cell is placed in the hypotonic solution, water will move into the cell by osmosis and it will become turgid.
* When the cell is placed in the isotonic solution, there is no net movement of water molecules and so the plant cell becomes flaccid.

Observations:
* The plant cell mass decreased when it was placed in the hypertonic solution because water moved from an area of low solute concentration to high solute concentration, out of the cell, causing it to plazmolyse.
* The plant cell placed in the hypotonic solution had an increased mass as water moved in from an area of low solute concentration to high solute concentration, into the cell, causing it to become turgid.
* There was no mass change in the plant cell placed in the isotonic solution because there was no net movement of water, and so the plant cell remained flaccid.

[Bad Student]

My first SAC is next week and I'd really appreciate if someone could please check if this aim, hypothesis and observations are valid and any possible changes I can make in order to achieve the best I possibly can.

Aim:
What you will be investigating – the aim of the experiment was to investigate Osmosis in a plant cell when placed in solutions with different solute concentrations.

Hypothesis:
The educated guess as to what will happen –
* When the cell is placed in the hypertonic solution, remember to point out the fact that its net movement water will move out of the cell by osmosis and the cells will plazmolyse.
* When the cell is placed in the hypotonic solution, water will move into the cell by osmosis and it will become the cell remains turgid- I think you said this yourself in one of the other threads turgid.
* When the cell is placed in the isotonic solution, there is no net movement of water molecules and so the plant cell becomes flaccid.

Observations:
* The plant cell mass decreased when it was placed in the hypertonic solution because water moved from an area of low solute concentration to high solute concentration, out of the cell, causing it to plazmolyse.
* The plant cell placed in the hypotonic solution had an increased mass as water moved in from an area of low solute concentration to high solute concentration, into the cell, causing it to become turgid.
* There was no mass change in the plant cell placed in the isotonic solution because there was no net movement of water, and so the plant cell remained flaccid.

[pi]

In you hypothesis, state what the tonicity is relative to.

[Yacoubb]

In you hypothesis, state what the tonicity is relative to.

Could you please elaborate on that?

[Yacoubb]

Thank you Bad Student - but are all the other aspects and the things I've written good, or do you think they're not so good. I just want to perfect them haha!

[Bad Student]

Could you please elaborate on that?

When you write that the cell is placed in the hypertonic solution, you should say that the concentration of solute in the solution is greater than the concentration of solute in the cell.

[Bad Student]

Thank you Bad Student - but are all the other aspects and the things I've written good, or do you think they're not so good. I just want to perfect them haha!

Everything else seems fine to me, but I'm not exactly the authority when it comes to prac reports.

[pi]

Could you please elaborate on that?

If you're moving a cell from a hypotonic solution to an isotonic solution, is that isotonic solution relative to the cell now or before you started?

[Yacoubb]

But wouldn't that be too much information for the hypothesis? I mean, I think the hypothesis should be an outline of what happens, and I'll elaborate on net movement of water molecules in the observation. Would that be sufficient?!

[Stick]

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.