Rishi's Biology Thread

[Rishi97]

In prokaryotic organisms
A. translation occurs at the ribosome
B. transcription occurs in the nucleus
C. chromosomes are usually linear
D. DNA is only found in plasmids

I thought the answer was D but it says A
Could you also provide a brief explanation?
Thanks guys

[nhmn0301]

In prokaryotic organisms
A. translation occurs at the ribosome
B. transcription occurs in the nucleus
C. chromosomes are usually linear
D. DNA is only found in plasmids

I thought the answer was D but it says A
Could you also provide a brief explanation?
Thanks guys

Prokaryotic cells do have ribosome. Ribosome is not a membrane bound structure. DNA is not only found in plasmid, a prokaryote can have DNA in its main circular chromosome and plasmid. Plasmid contains all the DNA that are transmitted from others bacteria and help the cell to gain resistance, whilst the main chromosome contains its own genetic material.

[katiesaliba]

Prokaryotic cells do have ribosome. Ribosome is not a membrane bound structure. DNA is not only found in plasmid, a prokaryote can have DNA in its main circular chromosome and plasmid. Plasmid contains all the DNA that are transmitted from others bacteria and help the cell to gain resistance, whilst the main chromosome contains its own genetic material.

Just to add to this, the circular chromosome within prokaryotes codes for majority of the cell's proteins

[Rishi97]

What is the difference between divergent evolution and parallel evolution?
Also, what is the difference between adaptive radiation and divergent evolution?
:p

[katiesaliba]

What is the difference between divergent evolution and parallel evolution?
Also, what is the difference between adaptive radiation and divergent evolution?
:p

Parallel evolution: two species which diverge from a common ancestor and independently evolve common features not present in the common ancestor due to similar selection pressures.

Divergent evolution: two species which diverge from a common ancestor and evolve different features due to different selection pressures.

Adaptive radiation is a specific type of divergent evolution that results in many species evolving from a common ancestor. 

In exam questions, they'll sometimes ask for the mode of evolution present in an example given. VCAA will accept either divergent evolution or adaptive radiation from what I can see in past reports. 

[bonkbadonk]

What is the difference between divergent evolution and parallel evolution?
Also, what is the difference between adaptive radiation and divergent evolution?
:p

Good thing to note is that parallel evolution is not on the study design. Not too sure about adaptive radiation since it doesn't make a specific reference to it, but it's a good thing to know nonetheless

[Scooby]

Good thing to note is that parallel evolution is not on the study design. Not too sure about adaptive radiation since it doesn't make a specific reference to it, but it's a good thing to know nonetheless

Yup, if they ask for the pattern of evolution and you write coevolution or parallel evolution, they won't give you a mark for it

[katiesaliba]

Good thing to note is that parallel evolution is not on the study design. Not too sure about adaptive radiation since it doesn't make a specific reference to it, but it's a good thing to know nonetheless

Adaptive radiation is. I've come across it in an examiner's report