Psyxwar's Biology 3/4 Question Thread

[Russ]

I would put in both for completeness, but according to the wording of that question you could probably get away with doing just supporting or just negating

[psyxwar]

I would put in both for completeness, but according to the wording of that question you could probably get away with doing just supporting or just negating

Thanks. How should a hypothesis by written in 3/4 Biology? I was always taught to write it beginning with "that...", but I've also read that you're supposed to write it in the form "if... then..." (eg. if increased temperature increases the rate of reaction then the reaction rate will be higher at higher temperatures than at lower temperatures" as opposed to "that the higher the temperature, the faster the reaction rate"

[alondouek]

Thanks. How should a hypothesis by written in 3/4 Biology? I was always taught to write it beginning with "that...", but I've also read that you're supposed to write it in the form "if... then..." (eg. if increased temperature increases the rate of reaction then the reaction rate will be higher at higher temperatures than at lower temperatures" as opposed to "that the higher the temperature, the faster the reaction rate"

I was taught to always begin a hypothesis with "It is to be predicted that..." - this has been +1'ed by my T.A. at uni. When writing a hypothesis, make sure you:

a) draw comparisons (i.e. "It is to be predicted that solution A will change in concentration compared to solution B") and

b) keep your tenses sorted (hypotheses should always be in the present tense, even though it is more intuitive to write in the future).

[psyxwar]

I was taught to always begin a hypothesis with "It is to be predicted that..." - this has been +1'ed by my T.A. at uni. When writing a hypothesis, make sure you:

a) draw comparisons (i.e. "It is to be predicted that solution A will change in concentration compared to solution B") and

b) keep your tenses sorted (hypotheses should always be in the present tense, even though it is more intuitive to write in the future).

So would something like "it is to be predicted that the optimal temperature of catalase in carrots is lower than the optimal temperature of catalase in humans (approx. 37 degrees Celsius)" be okay, even if the target of your comparison isn't actually being tested in the experiment itself?

[alondouek]

Well, you only need a comparison if there is more than one element being tested. So for your hypothesis, I assume the variable being tested for is the optimal temp of catalase. If this is correct, I would say something along the lines of "It is to be predicted that the catalase from carrots will work at an optimal rate at temperature; the rate of enzyme reaction will decrease with variance from this temperature."

Though this is admittedly a pretty vague hypothesis, it sort of gives you an idea of required syntax.

[psyxwar]

Well, you only need a comparison if there is more than one element being tested. So for your hypothesis, I assume the variable being tested for is the optimal temp of catalase. If this is correct, I would say something along the lines of "It is to be predicted that the catalase from carrots will work at an optimal rate at temperature; the rate of enzyme reaction will decrease with variance from this temperature."

Though this is admittedly a pretty vague hypothesis, it sort of gives you an idea of required syntax.

Ah nah I should have clarified -- the prediction was that the optimal temperature for catalase in carrots is lower than that of the optimal in humans (with the optimal temperature for human catalase given). But I think I understand now, thanks!

[psyxwar]

For an experiment that tests the effect of temperature on amylase activity, what is the significance of having a control at room temperature (without amylase activity)? Is it just so you have "normal" conditions, or is there a better way to put it?

[alondouek]

Well given that the variable you are testing is temperature, it stands to reason that the control sample should not have that variable altered beyond the environmental temperature. This is so that you can accurately compare and infer from the results obtained from samples that have been treated at both high and low temperatures. Essentially, it gives you a 'base-point' with which to understand results from the experimental groups.

[Yacoubb]

You really are just setting up a point of comparison so that any effects on the activity of amylase can be attributed to the independent variable, which in this case, is temperature. You are ultimately comparing the rate of enzymatic activity in different temperature conditions to determine temperature optima, and so its imperative you have a point of comparison at which you have variables controlled like temperature; if you didn't have it at room temperature, than we can say that enzymatic activity at 30 degrees C would not be as efficient as 20 degrees C, because room temperature may have had some influence. Its eliminating all those extraneous variables and attributing all effects on the DV with the IV under investigation.

[psyxwar]

Does signal amplification happen with lipid-soluble hormones? Could someone explain this to me please?

[Rachet123]

Does signal amplification happen with lipid-soluble hormones? Could someone explain this to me please?

Yes

[Snorlax]

Does signal amplification happen with lipid-soluble hormones? Could someone explain this to me please?

I would image all hormones undergo signal amplification

[ealam2]

Could someone please explain to me what signal amplification is? I don't think I understand it fully.

[Random_Acts_of_Kindness]

Could someone please explain to me what signal amplification is? I don't think I understand it fully.

http://highered.mcgraw-hill.com/olcweb/cgi/pluginpop.cgi?it=swf::535::535::/sites/dl/free/0072437316/120069/bio08.swf::Signal%20Amplification

 

[Snorlax]

http://highered.mcgraw-hill.com/olcweb/cgi/pluginpop.cgi?it=swf::535::535::/sites/dl/free/0072437316/120069/bio08.swf::Signal%20Amplification

 

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