VCE Biology Question Thread

[gohfish]

How many electrons and hydrogen ions join with the acceptor molecule NADP+ to form NADPH?

Is it two electrons and one hydrogen ion?

Yep

[lzxnl]

You can work it out
NADP+ + H+ would give you NADPH, except with a +2 charge. So you need two electrons to balance it

[RazzMeTazz]

What is the role of NADPH in the Calvin-Benson cycle?

Does it donate protons to G3P to form PGAL or does it donate both protons and electrons to G3P to form PGAL.

My textbook says it donates protons, but I think I have come across some online sources that say that electrons are also donated from NADPH to G3P to form PGAL.
 

Thanks!

[alchemy]

What's the difference between excitatory and inhibitory neurons?
I know that excitatory neurotransmitters (e.g. dopamine) stimulate the brain, while inhibitory neurotransmitters (e.g. serotonin) relax the brain. Do excitatory and inhibitory neurons have the same or similar effect?
My guess is that excitatory neurons induce a response in the target cell, whereas inhibitory neurons prevent a response from being reached. Not too sure though

[vox nihili]

What's the difference between excitatory and inhibitory neurons?
I know that excitatory neurotransmitters (e.g. dopamine) stimulate the brain, while inhibitory neurotransmitters (e.g. serotonin) relax the brain. Do excitatory and inhibitory neurons have the same or similar effect?
My guess is that excitatory neurons induce a response in the target cell, whereas inhibitory neurons prevent a response from being reached. Not too sure though

Your guess is right. Inhibitory neurtransmitters stop the action potential from being passed on to the next cell.

[MM1]

What does it mean when lymphatic capillaries are referred to as blind-ending? Thanks!

[vox nihili]

What does it mean when lymphatic capillaries are referred to as blind-ending? Thanks!

No through road.

[katiesaliba]

This is probably a stupid question, but what is the stimulus for everyday movement? Thought? What stimulus allows me to type this sentence? This has always confused me when it comes to the nervous system!

[vox nihili]

This is probably a stupid question, but what is the stimulus for everyday movement? Thought? What stimulus allows me to type this sentence? This has always confused me when it comes to the nervous system!

It's an internal stimulus originating from the pre-frontal cortex.

[howlingwisdom]

Is the reason why second messengers are generally needed in peptide hormone signalling because they are unable to pass through the phosophilipid bilayer? (And thus require second messengers to relay the hormone's signal from the membrane receptor to target molecules inside the cytoplasm or nucleus?)

[vox nihili]

Is the reason why second messengers are generally needed in peptide hormone signalling because they are unable to pass through the phosophilipid bilayer? (And thus require second messengers to relay the hormone's signal from the membrane receptor to target molecules inside the cytoplasm or nucleus?)

Hit the nail on the head there.

[katie101]

Do neurons in the small intestine have myelin sheaths?

[grannysmith]

What's everyone up to in bio (both individually and in class)? I've looked over the course outline calendar and Term 2 just seems so hectic >.<
Not to mention yr11 mid-year exams in ~6 weeks :/

[Rishi97]

What's everyone up to in bio (both individually and in class)? I've looked over the course outline calendar and Term 2 just seems so hectic >.<
Not to mention yr11 mid-year exams in ~6 weeks :/

Class : plant hormones
Me:  homeostasis. lol, just a tad behind 
btw, good luck for your exams

[rhinwarr]

My class just started talking about pathogens today.