VCE Biology Question Thread

[millie96]

this might seem like a stupid question, but I was at a lecture and they did their linked cross with symbols like ab/AB. Is this the same type of cross to the XX & XY crosses (sex linked)?

[Vicbelgaus]

Quick questions, whats a transitional fossil and what and how does an actional potential work?( is it something like the K+ions in and Na+ out)

 Thanks

A transitional fossil, is a fossil that showns an organism that is an intermediate form between two ancestral groups, for example a archeopteryx fossil is a transitional form as it demonstrate the evolutionary connection between lizards and birds.

[katiesaliba]

Quick questions, whats a transitional fossil and what and how does an actional potential work?( is it something like the K+ions in and Na+ out)

 Thanks

Transitional fossil=intermediate form between ancestral species.

Sodium rushes in, potassium rushes out. I'd suggest looking at some images on google because it's hard to explain :')

this might seem like a stupid question, but I was at a lecture and they did their linked cross with symbols like ab/AB. Is this the same type of cross to the XX & XY crosses (sex linked)?

Nope, they're different.

[ValiantIntellectual]

How can something be a homologous structure and a analogous structure?

[katiesaliba]

How can something be a homologous structure and a analogous structure?

It can't.

[alondouek]

How can something be a homologous structure and a analogous structure?

They describe two completely opposite things:

- Homologous structure: Similar morphology/anatomy/genetic composition and development patterns (in some cases) BUT different function;

- Analogous structure: Similar general function, BUT the morphology/anatomy/whatever of the structure in question is different.

Hope that clarifies.

[Reus]

Finally got 100% on a past VCAA exam haha 

[DJA]

Finally got 100% on a past VCAA exam haha 

well played - which year and exam 

[Reus]

well played - which year and exam 

2007 U3!

[shivaji]

in hominins, is the foramen magnum located at -the centre of the base of the skull,
                                                                 OR     - base of the skull
                                                                 OR     - centre of the skull ?

[howlingwisdom]

in hominins, is the foramen magnum located at -the centre of the base of the skull,
                                                                 OR     - base of the skull
                                                                 OR     - centre of the skull ?

In hominins, it is located at the centre of the skull so that the skull can be fully balanced and supported while walking.

[shan_19]

Are macrophages used to inhibit the spread of all invading pathogens?

[Damo23]

Are macrophages used to inhibit the spread of all invading pathogens?

I think that's what antibiotics do, macrophages engulf foreign material and show specialized cell(b or T cells). I'm not 100% sure, so correct me if I'm wrong

[shan_19]

I'm not sure if that's right or not, but thanks anyway.

[grannysmith]

Are macrophages used to inhibit the spread of all invading pathogens?

What do you mean by this?