Indicate true (T) and false (F) statements below regarding the genetic systems of mitochondria and chloroplasts. Your answer would be a four-letter string composed of letters T and F only, e.g. TFTT.
( ) Most proteins in these organelles are encoded by the organelle's genome.
( ) Mammalian mtDNA can make up less than 1% of the total cellular DNA.
( ) In some highly specialized animal cells, mtDNA can comprise as much as 99% of the cellular DNA.
( ) The genetic systems of these organelles are most similar to extremophilic archaea.

Question

Indicate true (T) and false (F) statements below regarding the genetic systems of mitochondria and chloroplasts. Your answer would be a four-letter string composed of letters T and F only, e.g. TFTT.
( )	Most proteins in these organelles are encoded by the organelle's genome.
( )	Mammalian mtDNA can make up less than 1% of the total cellular DNA.
( )	In some highly specialized animal cells, mtDNA can comprise as much as 99% of the cellular DNA.
( )	The genetic systems of these organelles are most similar to extremophilic archaea.

Quizplus · Accepted Answer

The genetic systems of mitochondria and chloroplasts resemble those of prokaryotes. However, intracellular gene transfer to the nucleus over an evolutionary time scale has shrunk their genomes to a level such that most of their proteins are encoded by the nucleus in modern organisms. Depending on the number of mitochondria and their chromosome copy number, mitochondrial DNA (mtDNA) can account for less than 1% to about 99% of total DNA weight in a cell.

Indicate True (T) and False (F) Statements Below Regarding the Genetic