DNA Help please!?

Question

6.Organelles that contain DNA include which of the following?
A. mitochondria
B. ribosomes
C. chloroplasts
D. Both mitochondria and chloroplasts
E. All of these do.

Answer 1

The answer is D, both mitochondria and chloroplast. Most pepole might disagree, but it's actually true.

Mitochondria and chloroplast actually are believed by scientists to have lived individually on earth before the existance of cell membrane, nucleus, etc. They were able to survive because they have their own DNA strand. These DNA are mostly responsible for metabolism. Over time, they developed cell membranes and other organelles to form the complex cells known today.

Now, the DNA that are contained in the nucleus of a cell carries our genes, but these are different from the ones in mitochondria or chloroplast. In everyday life, when we speak of DNA, we are usually referring to the ones in the nucleus, rather than the ones in mitochondria and chloroplast.

Here's a link that might be helpful - http://en.wikipedia.org/wiki/Mitochondrial_DNA

Ribosome is definitely wrong. There is no DNA in ribosomes. The infomation on DNA is transferred from the nucleus to the ribosomes by tRNA, where proteins are synthesized.

The answer is therefore, D.

I hope I explained it well. :P

Answer 2

I'd say D. Mitochondria have their own primitive DNA (believed to be left over from when they were a separate organism, before they were integrated into other cells as a symbiote a billion or so years ago).

Chloroplasts are essentially inside-out mitochondria with chlorophyll, and are known to carry their own DNA (again, believed to be a holdover from when they were independent organisms).

Ribosomes have rRNA, which is similar to DNA, but not the same. Ribosomes bind with mRNA transcribed from the DNA in the nucleus to produce proteins. Again, similar, but not DNA.

Definitely D.

Answer 3

First of all you must know the basics of DNA. DNA is the instructions on making protein. The nucleus holds the DNA and doesn't all the DNA to pass, the only thing that can pass are copies of the DNA. So which of the above are proteins? Ribosomes can make the proteins, so that's one of the answers. Mitochondria can use protein and convery it into ATP (energy for the cell. And Chloroplasts hold Chlorophyll.

My Answer:
B

Answer 4

Oh jeez, I can't believe 3 people got it wrong.

It's D. Mitochondria have mtDNA and chloroplasts have chloroplast DNA.

Answer 5

Native Americans are not East Asians AT ALL. There is a tendency among Eurocentric scholars based on superficial likeness to assimilate Native Americans with East Asians. They have a very different DNA. Eurocentric scholars do that a lot; maybe they want to prove that Native Americans are not so "Native" after all and that they are descendants of East Asians who crossed the Bering Strait thousands of years ago. The same Eurocentric scholars don't do the same thing with Melanesians, papuans or even the Olmecs (who appear to have "African features"). They NEVER ask whether Melanesians, papuans or even Olmecs are African based on their features. Equating Native Americans with East Asians proves that Eurocentric scholars and those who have been brainwashed by them have a racist agenda.

Answer 6

D. Mitochondrion have Mitochondrial DNA (mtDNA), and chloroplasts have Chloroplast DNA (ctDNA).

Answer 7

answer is D. mitochondria hv mtDNA. this DNA is important in deterniming maternal inhertiance. ribosome only have rRNA

Answer 8

That would be B