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March 29, 2024, 07:56:21 pm

Author Topic: VCE Biology Question Thread  (Read 3571503 times)  Share 

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vox nihili

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Re: VCE Biology Question Thread
« Reply #930 on: February 26, 2014, 10:03:13 pm »
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for hypotonic solutions my revision sheet says "remember to say compared to the cytosol the solution is hypotonic. How is cytosol involved in hypertonic/hypotonic solutions.?

Hypotonic means "the solutes are less concentrated than ____". The cytosol is the fluid you often compare it to.
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grannysmith

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Re: VCE Biology Question Thread
« Reply #931 on: February 26, 2014, 10:12:23 pm »
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Hey guys I am stumped on this question.
In eukaryotic cells the conversion of adp and phosphate into ATP occurs:.....

I put my answer as "in both the mitochondria and the cytoplasm, and releases energy" since cellular respiration involves a catabolic reaction.
But the answer is "in both the mitochondria and the cytoplasm, and requires energy".
Why is this so? I have a hunch  that it's because energy is needed to convert adp and phosphate into ATP but I'm not sure.  :-\
Yeah, the formation of ATP from ADP + Pi is an anabolic process, hence an endergonic (energy-requiring) process.

Jason12

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Re: VCE Biology Question Thread
« Reply #932 on: February 27, 2014, 04:27:19 pm »
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I know there are hydrogen bonds between nucleotides in DNA but what about rna since it is single stranded so where do the h bonds go
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Chang Feng

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Re: VCE Biology Question Thread
« Reply #933 on: February 27, 2014, 04:29:45 pm »
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For hypertonic and hypertonic. Is it true that it always compares the cell to the external solution. So the cell is hypertonic to the sucrose solution, so the cell is hypertonic and hence has more sugar. Or not???

grannysmith

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Re: VCE Biology Question Thread
« Reply #934 on: February 27, 2014, 04:51:31 pm »
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For hypertonic and hypertonic. Is it true that it always compares the cell to the external solution. So the cell is hypertonic to the sucrose solution, so the cell is hypertonic and hence has more sugar. Or not???
Yeah, pretty much, although it refers to solutions and their relative concentration of solutes in general.
So if the cell is hypertonic to its extracellular fluid, then the extracellular fluid is hypotonic to the cell. But it doesn't necessarily refer to a specific solute (sucrose), rather it refers any type of solute (substances which dissolve in the solvent, water).

nhmn0301

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Re: VCE Biology Question Thread
« Reply #935 on: February 27, 2014, 05:41:18 pm »
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If I place a beetroot cell inside a solution with a pH of 10 and observes that there is not net movement of pink pigment from the beetroot cell (anthocyanin substance) outside of the cell. Is it possible for me to assume that the alkalinity of pH 10 has no effect on the cell's membrane and hence create no net movement of solute?
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katiesaliba

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Re: VCE Biology Question Thread
« Reply #936 on: February 27, 2014, 06:15:06 pm »
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In the Calvin cycle, does the anabolism of RuBP and CO2 produce water? I'm trying to figure out where the water product in the photosynthesis equation comes from! Also, when CO2 combines with RuBP, is O2 released?

Does the amount of PGAL/G3P released for glucose synthesis vary in photosynthesising organisms?

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Jason12

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Re: VCE Biology Question Thread
« Reply #937 on: February 27, 2014, 09:35:01 pm »
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in diffusion and osmosis what is meant by NET movement of a substance/water molecules?

Also what is a good definition/explanation of a protein channel?
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rhinwarr

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Re: VCE Biology Question Thread
« Reply #938 on: February 27, 2014, 09:50:26 pm »
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In reality, the particles move in both directions but due to the concentration gradient, the overall movement is down the concentration gradient. Even in equilibrium when the concentrations are the same, the particles are still moving between the solutes but there is no overall movement (change in concentration).

A protein channel is a protein embedded in the plasma membrane which facilitates the movement of particles across the membrane by facilitated diffusion or active transport.

vox nihili

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Re: VCE Biology Question Thread
« Reply #939 on: February 27, 2014, 11:22:15 pm »
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Every atom, even those that are metallic, are always on the move. It's impossible for them not to be (practically).
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eagles

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Re: VCE Biology Question Thread
« Reply #940 on: February 28, 2014, 06:27:37 pm »
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How is the amylase in fungi similar/different from amylase in humans?

They're different because they function at different optimum temperatures.

While the optimum temperate for amylase in humans may be around 35 degrees Celsius, it is much higher in fungi because of the warm environments they live in, thus contributing in an increased optimum temperature.

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Re: VCE Biology Question Thread
« Reply #941 on: February 28, 2014, 08:41:49 pm »
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They're different because they function at different optimum temperatures.

While the optimum temperate for amylase in humans may be around 35 degrees Celsius, it is much higher in fungi because of the warm environments they live in, thus contributing in an increased optimum temperature.

Yeah, I guess. Now I really know I got that one wrong..uhhh

Chang Feng

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Re: VCE Biology Question Thread
« Reply #942 on: February 28, 2014, 11:55:31 pm »
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Hey. For plant hormones gibberellins are we required to know the process of seed germination?? Thanks.

Rishi97

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Re: VCE Biology Question Thread
« Reply #943 on: March 01, 2014, 10:17:45 am »
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List three possible death signals a cell might receive to initiate apoptosis

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Chang Feng

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Re: VCE Biology Question Thread
« Reply #944 on: March 01, 2014, 02:20:46 pm »
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If the cells are no longer needed, if they are malfunctioning/ not working properly anymore. If there are too many of the cells in the body. Think I'm missing one