VCE Biology Question Thread

[pie]

Hey Guys,

Can someone please explain the question in the picture attached for Part a and b please

The answer in the solutions for part a is light-dependent reaction, I don't understand why?

Cheers,

[bae]

Hey Guys,

Can someone please explain the question in the picture attached for Part a and b please

The answer in the solutions for part a is light-dependent reaction, I don't understand why?

Cheers,

a. Light Dependent Reaction. We know this because the NADPH has not donated the Hydrogen yet, this happens in the Light Independent Stage.
b. This reaction occurs in the thylakoid membranes of the chloroplasts.

Your welcome.

[faso]

Can someone explain compensation point to me?

[Jay.C]

Can someone explain compensation point to me?

The compensation point is when the amount of CO2 taken up by photosynthesis is equal to the amount of CO2 given off by cellular respiration.

[CarterGray12]

How would the addition of detergent to a solution containing an enzyme and starch produce bubbles? The amount produced = rate of reaction?

[StupidProdigy]

Why is it that peas heated in a microwave will still perform cellular respiration but barely at all? This is a sac question I have and I'm not sure if it's suggesting there was a source of error as the peas in the microwave should of become to hot to respire?? Thanks!

[faso]

Why is it that peas heated in a microwave will still perform cellular respiration but barely at all? This is a sac question I have and I'm not sure if it's suggesting there was a source of error as the peas in the microwave should of become to hot to respire?? Thanks!

Its because enzymes would denature.

[StupidProdigy]

Its because enzymes would denature.

There was still a slight change in respiration shown in the results though, so does this mean maybe say 1 pea still hadn't completely denatured?

[faso]

There was still a slight change in respiration shown in the results though, so does this mean maybe say 1 pea still hadn't completely denatured?

Yep, If you wanna practice do question 3e EXAM 1 SECT B VCAA 2009
Very similar question

[kimmytaaa]

Has anyone done the photosynthesis prac from QATS paper?

[Sine]

What are typical questions for the Cellular Respiration and Photosynthesis SAC?

[Jay.C]

What are typical questions for the Cellular Respiration and Photosynthesis SAC?

1. What is the compensation point?
2. Write both the worded and chemical equation for photosynthesis.
3. What are the factors effecting photosynthesis?
4. What is the interrelationship between photosynthesis and cellular respiration?
5. Explain the three stages of Cellular respiration and what occurs during these stages.
6. Draw a diagram of the chloroplast labelling where the two stages of photosynthesis occurs.
7. What is the primary function of the chloroplast?
8. What are the inputs and outputs of the light dependant and independent stages of photosynthesis?
9. How is carbon use effected at different light intensities?
10. What is the light independent stage of photosynthesis dependant on?
11. Write both the chemical and worded equation of aerobic cellular respiration.

[Rishi97]

What are typical questions for the Cellular Respiration and Photosynthesis SAC?

Remembering from last year, you may need to interpret graphs as well

[CarterGray12]

I had my enzyme Prac today, the write up is next lesson. In our experiment we ground up liver, potato and other cells then added the same amount of substrate (hydrogen peroxide) and detergent. The height the bubbles reached was the amount of oxygen and hence product produced. My question is, if there was the same amount of substrate, why didn't all bubbles reach the same height eventually? given that all the cells contained some of the enzyme (catalase)? Also, does anyone have some sample questions i may be asked for those of you who have already completed this sac. Thanks 

[bae]

I had my enzyme Prac today, the write up is next lesson. In our experiment we ground up liver, potato and other cells then added the same amount of substrate (hydrogen peroxide) and detergent. The height the bubbles reached was the amount of oxygen and hence product produced. My question is, if there was the same amount of substrate, why didn't all bubbles reach the same height eventually? given that all the cells contained some of the enzyme (catalase)? Also, does anyone have some sample questions i may be asked for those of you who have already completed this sac. Thanks 

Although they all contained the same amount of enzymes, and there was sufficient substrate, the reason that the bubbles didn't reach the same height eventually is because of surface area. I would presume that the ground liver would produce the most bubbles, as an increase in surface area to volume ratio means that there is more enzymes (in this case catalase) available to bind with a substrate. Furthermore, as a result in such an increased rate in reaction you would have also observed a change in temperature in each of your beakers, with faster reactions exhibiting higher temperature changes.