2009 Biology Unit 3 Exam Suggested Solutions

[Lemollin]

Hm ok, this is quite a strange question.

My assumption is that the drug would be in the red blood cells. Thus the drug would be enclosed in the RBC's phospholipid cell membrane.  

Why did you guys put protein as your answer?  Because there's hemoglobin in the RBCs, which is made of protein (and iron)?

The drug is not necessarily a steroid hormone.

Yea, i was thinking of Haemoglobin.... damn another mark gone

Oh and btw, Short answers Q6a(2) -> connecting neurone, is that the same as sensory/afferent neurone??

[polky]

Hm ok, this is quite a strange question.

My assumption is that the drug would be in the red blood cells. Thus the drug would be enclosed in the RBC's phospholipid cell membrane. 

Why did you guys put protein as your answer?  Because there's hemoglobin in the RBCs, which is made of protein (and iron)?

The drug is not necessarily a steroid hormone.

Yea, i was thinking of Haemoglobin.... damn another mark gone

Oh and btw, Short answers Q6a(2) -> connecting neurone, is that the same as sensory/afferent neurone??

Connecting neuron is analogous to interneuron, I think.  Not the same as sensory neuron.

[n.f]

6a's diagram is a little sketchy in my opinion. That optic nerve line looks like it goes to a T. Could it be referring to above neurone?

[Lemollin]

Connecting neuron is analogous to interneuron, I think.  Not the same as sensory neuron.

So Sensory neuron for Q6a(2) is wrong, dam....

[Pumpkinator]

connecting neuron is intermediate neuron or interneuron

[polky]

Connecting neuron is analogous to interneuron, I think.  Not the same as sensory neuron.

So Sensory neuron for Q6a(2) is wrong, dam....

No, sensory neuron is right!

[hard]

Connecting neuron is analogous to interneuron, I think.  Not the same as sensory neuron.

So Sensory neuron for Q6a(2) is wrong, dam....

No, sensory neuron is right!

but the arrow is targeting the neuron thats in the brain so wouldn't it be a interneuron?

[Lemollin]

No, sensory neuron is right!

Cool.... =]

but the arrow is targeting the neuron thats in the brain so wouldn't it be a interneuron?

Thats what i think too, so sensory neuron is the correct answer!

[Pumpkinator]

i think 2 is connecting neuron as well

[polky]

Connecting neuron is analogous to interneuron, I think.  Not the same as sensory neuron.

The diagram makes it out to be one long neuron that will stretch from your eye to your brain.  The little round thing is the cell body?

So Sensory neuron for Q6a(2) is wrong, dam....

No, sensory neuron is right!

but the arrow is targeting the neuron thats in the brain so wouldn't it be a interneuron?

The diagram makes it out to be a single long neuron that goes from retina to brain.  Interneurons connect neurons to neurons.  This is connecting retina to neuron.
I don't think this is how nerves are arranged in real life.  In real life, there would probably be interneurons involved.  But the diagram makes it out that you only have 2 neurons in your eye system, one sensory and one motor.

[shinny]

6a's diagram is a little sketchy in my opinion. That optic nerve line looks like it goes to a T to me. Could it be referring to above neurone?

Yeh the diagram is confusing me. Where exactly is the 'optic nerve' label pointing to? It doesn't even go to the nerve -_- If anyone's got a good interpretation of it, chuck it here! Whilst I do agree with the before points about what the diagram looks like and that it does seem to be a sensory neuron, hard has a point.

When contrasted with the peripheral nervous system (PNS), the neurons of the central nervous system, including the brain, are all interneurons.

As it's in the brain tissue in the diagram, and the fact that it joins to a motor nerve, I'll go back to my previous answer.

[lukeperry91]

have you guys noticed how theres no arrows giving a direction for the action potential? ie, most people will read it clockwise and call 1. the receptor

[n.f]

have you guys noticed how theres no arrows giving a direction for the action potential? ie, most people will read it anti clockwise and call 1. the receptor

Yeah I did that on my first run through; picked it up when I checked my answers though

[Lemollin]

have you guys noticed how theres no arrows giving a direction for the action potential? ie, most people will read it clockwise and call 1. the receptor

Good point there, but you can pretty much figure out what it is from the shape can you?

[hard]

Thyroxin, although an amino acid hormone, can pass through the phospholipid cell membrane and its receptors are located in the cytoplasm so I'm pretty sure that model S is the correct one here.

no its T