question on mitochondria

[sickeye29]

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all right so this question is from the kaplin lesson book page 68. I got to say i really hope some of the questions on the DAT aren’t as poorly worded as the kaplin questions. Or maybe there’s something i just don’t see about this question. If some one can help me out with this one that would be much appreciated.

Which of the following is not true of mitochondria?
a) it contains double stranded circular DNA
b) it contains its own ribosomes.
c) it is a two membrane structure.
d) it is involved in lipid synthesis.
e) it replicates by binary fission.

I believe the answer is "D" because that’s the one that makes the most sense and is circled from when my buddy took the class. But truly i believe that they are all true about mitochondria especially "D" because mitochondria are involved with fatty acid elongation which in turn is a lipid. In fact when i search the web i can find all of these things to be true about mitochondria, just check Wikipedia

 

[SuperC]

all right so this question is from the kaplin lesson book page 68. I got to say i really hope some of the questions on the DAT aren’t as poorly worded as the kaplin questions. Or maybe there’s something i just don’t see about this question. If some one can help me out with this one that would be much appreciated.

Which of the following is not true of mitochondria?
a) it contains double stranded circular DNA
b) it contains its own ribosomes.
c) it is a two membrane structure.
d) it is involved in lipid synthesis.
e) it replicates by binary fission.

I believe the answer is "D" because that’s the one that makes the most sense and is circled from when my buddy took the class. But truly i believe that they are all true about mitochondria especially "D" because mitochondria are involved with fatty acid elongation which in turn is a lipid. In fact when i search the web i can find all of these things to be true about mitochondria, just check Wikipedia

It must be a mistake.
a) it contains double stranded circular DNA (True, they contain mtDNA)
b) it contains its own ribosomes. (True, they can synthesize their own proteins
c) it is a two membrane structure. (Yes this is true for the mitochondria and the nucleous)
d) it is involved in lipid synthesis. (True it is involved in lipid synthesis AND oxidation of Fatty acids)
e) it replicates by binary fission. (Also TRUE)

Just a typo.
-C

 

[Moni Ahmadian]

Dude,

only d is not true. Fatty acid biosynthesis happens on main part in the cytosol. It however needs acetyl coA which is transported out of the mito for biosynthesis. Fatty acid beta oxydation happens in the mito on the other hand.

all right so this question is from the kaplin lesson book page 68. I got to say i really hope some of the questions on the DAT aren't as poorly worded as the kaplin questions. Or maybe there's something i just don't see about this question. If some one can help me out with this one that would be much appreciated.

Which of the following is not true of mitochondria?
a) it contains double stranded circular DNA
b) it contains its own ribosomes.
c) it is a two membrane structure.
d) it is involved in lipid synthesis.
e) it replicates by binary fission.

I believe the answer is "D" because that's the one that makes the most sense and is circled from when my buddy took the class. But truly i believe that they are all true about mitochondria especially "D" because mitochondria are involved with fatty acid elongation which in turn is a lipid. In fact when i search the web i can find all of these things to be true about mitochondria, just check Wikipedia

 

[Moni Ahmadian]

Well d might not be right. It's a tricky question because the fatty acid biosynth is trigged in the mito but is carried out in cytosol. So I guess d is the best answer

all right so this question is from the kaplin lesson book page 68. I got to say i really hope some of the questions on the DAT aren’t as poorly worded as the kaplin questions. Or maybe there’s something i just don’t see about this question. If some one can help me out with this one that would be much appreciated.

Which of the following is not true of mitochondria?
a) it contains double stranded circular DNA
b) it contains its own ribosomes.
c) it is a two membrane structure.
d) it is involved in lipid synthesis.
e) it replicates by binary fission.

I believe the answer is "D" because that’s the one that makes the most sense and is circled from when my buddy took the class. But truly i believe that they are all true about mitochondria especially "D" because mitochondria are involved with fatty acid elongation which in turn is a lipid. In fact when i search the web i can find all of these things to be true about mitochondria, just check Wikipedia

 

[SuperC]

Read D one more time... It asks if it is INVOLVED in lipid synthesis. The mitochondria IS 100% INVOLVED in some lipid synthesis. It may not do it all but again it is INVOLVED. So D is NOT the correct choice.

This is from my Histology text.

"These organelles (mitochondira) also assist in the synthsis of certain lipids and proteins" Gartner and Hiatt, Color Atlas of Histology Pg 1

Again, you guys need to READ specifically what the questions asks.

So that we are clear.... If my buddy robs a bank and I drive the car, would be "involved" in the robbery.

Remember this RTFQ: Read The F.....ing Question.

-C

 

[Moni Ahmadian]

Well I agree with you that mito is involved. But in this question that all other choices are right the only possible wrong answer is d. Mito makes precursor of the fatty acid biosynthesis but it is not directly involved in the biosynthesis. This is from Voet, probably the finest biochem text available. Still as you said it is indirectly involved and it perfectly fits for the best choice. Where is this question from anyway? Is it from an official DAT example or just one of those stupid books out there. oxaloacetate is a precursor for glucose synthesis and it is made in the mito but mito does not carry out gluconogenesis. So, i'm still pretty sure d is the best choice.

Read D one more time... It asks if it is INVOLVED in lipid synthesis. The mitochondria IS 100% INVOLVED in some lipid synthesis. It may not do it all but again it is INVOLVED. So D is NOT the correct choice.

This is from my Histology text.

"These organelles (mitochondira) also assist in the synthsis of certain lipids and proteins" Gartner and Hiatt, Color Atlas of Histology Pg 1

Again, you guys need to READ specifically what the questions asks.

So that we are clear.... If my buddy robs a bank and I drive the car, would be "involved" in the robbery.

Remember this RTFQ: Read The F.....ing Question.

-C

 

[SuperC]

The OP said it was from Kaplan.... Which is known for mistakes.
-C

 

[Moni Ahmadian]

It is a stupid question by itself and personally i have not seen this type of question on DAT. But still that is from the Voet and I have to believe dude😀

The OP said it was from Kaplan.... Which is known for mistakes.
-C

 

[nate28]

I thought lipids were synthesised in the smooth er... 😕

 

[Moni Ahmadian]

Nate,

Smooth ER contains Ca which is required for various lipid processing. Also the most important enzyme in cholesterol synthesis, HMG-CoA reductase sits on the surface of the ER. But lipid biosynth happens in the cytosol only its precursor is made in the mito.

I thought lipids were synthesised in the smooth er... 😕