VCE Biology Question Thread

[dankfrank420]

NAD+ is unloaded, NADH is loaded

Thanks. I always thought that they were the same thing as a hydrogen atom = 1 positive charge.

[Reus]

Correct me if I'm wrong but the 3' to 5' strand of DNA is the template strand for protein synthesis since RNA needs to be transcribed from 5' to 3' (RNA polymerase) right?

[shivaji]

Correct me if I'm wrong but the 3' to 5' strand of DNA is the template strand for protein synthesis since RNA needs to be transcribed from 5' to 3' (RNA polymerase) right?

if that's the case  then couldn't rna polymerase just go to the other end of the other strand and transcribe?

[Reus]

if that's the case  then couldn't rna polymerase just go to the other end of the other strand and transcribe?

I've been told that most polymerases (if not all) have the 3' to 5' recognition activity. And so create a mRNA from 5' to 3'

[grannysmith]

I've been told that most polymerases (if not all) have the 3' to 5' recognition activity. And so create a mRNA from 5' to 3'

Yeah the main thing here is that DNA is always read from 3' to 5', and polymerases always builds in a 5' to 3' direction.

[Rishi97]

Cellular respiration occurs
A. during the day and night
B. only during the day
c. only during the night
d. only when photosynthesis is not occurring

I'm stuck between a and d

[grannysmith]

Cellular respiration occurs
A. during the day and night
B. only during the day
c. only during the night
d. only when photosynthesis is not occurring

I'm stuck between a and d

Must be A; photosynthesis only produces glucose, but cellular respiration is the process that actually uses glucose to produce ATP.

[Reus]

Cellular respiration occurs
A. during the day and night
B. only during the day
c. only during the night
d. only when photosynthesis is not occurring

I'm stuck between a and d

Has to be A, the cells won't fulfil their functionality without cellular respiration. And I'm sure that photosynthesis and cellular respiration occur simultaneously hence making D incorrect (compensation pt).

[vox nihili]

Correct me if I'm wrong but the 3' to 5' strand of DNA is the template strand for protein synthesis since RNA needs to be transcribed from 5' to 3' (RNA polymerase) right?

They READ 3'-5', which is like left to right. New strand is 5'-3'

[TimewaveZero]

Is every type protein produced within a cell presented by MHC I markers?

[vox nihili]

Is every type protein produced within a cell presented by MHC I markers?

Not ones that are localised to organelles I'd imagine.

[Stew_822]

Must be A; photosynthesis only produces glucose, but cellular respiration is the process that actually uses glucose to produce ATP.

woah there fella,

I'm pretty sure ATP is produced in the light-dependant reactions of photosynthesis, in a way similar to the electron transport chain in mitochondria. The ATP is used to supply the energy for the calvin cycle, in which glucose is produced. So ATP is actually produced, it's just used to make the glucose. But I agree A is the most correct answer.

[grannysmith]

woah there fella,

I'm pretty sure ATP is produced in the light-dependant reactions of photosynthesis, in a way similar to the electron transport chain in mitochondria. The ATP is used to supply the energy for the calvin cycle, in which glucose is produced. So ATP is actually produced, it's just used to make the glucose. But I agree A is the most correct answer.

Yeah, I probably should've elaborated a bit more; basically, the main purpose of photosynthesis is to produce glucose to be used in cellular respiration. Yes, ATP is produced in the light-dependent stage, but it is ultimately used to synthesise glucose and is not used to fuel other cellular reactions that require energy.

[TimewaveZero]

Not ones that are localised to organelles I'd imagine.

ahh, makes sense.. thankyou

[minik]

can someone give me one of two examples of the stimulus response model (nervous system)
thanks!!