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24 votes

Does the cytoplasm include the organelles?

The cytoplasm is like the ocean. When you talk about the ocean, do you include the fish? What about islands? Sometimes yes, sometimes no. You could use a cytosol/cytoplasm distinction, where cytosol ...
Bryan Krause's user avatar
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18 votes

Does the cytoplasm include the organelles?

The young scientist asks: “What is the correct definition?”. The old scientist answers: “As is often the case in biology, there is no correct definition — different people adopt different usages.” ...
David's user avatar
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5 votes

What will happen if mitochondria had a structure like lysosomes?

Mitochondria are double membraned organelles with an outer membrane which is a rod-like shape, and a convoluted inner membrane (Figure 1). Figure 1 On the other hand, a lysosome is a single-...
liliae's user avatar
  • 636
5 votes

Do Archaea have membrane-bound organelles?

A) Archaea cells contain small membrane-enclosed organelles; bacteria do not. FALSE. As you said, Archaea and Bacteria are prokaryotes: that don't have any ...
biozic's user avatar
  • 616
5 votes

Which organelle is the easiest to see in a cell?

A quick google revealed this slideshow that says the nucleus is the easiest organelle to see. Generally, this is what is taught in schools worldwide. Note that mature red blood cells don't have a ...
James's user avatar
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4 votes

Are there any viruses that integrate their DNA into organellar DNA?

I'm only aware of one paper that claims to show regular viral integration into mitochondrial DNA, and even there they suggest it might be a host defense rather than a viral life cycle thing: ...
iayork's user avatar
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4 votes
Accepted

Why do ribosomes associate with rough endoplasmic reticulum but not other membranes?

Peptides that are destined to be either secreted or included in the cell membrane have a signal sequence that binds a protein called Signal Recognition Particle (SRP). The SRP will in turn bind to ...
kingfishersfire's user avatar
3 votes
Accepted

Why is sedimentation rate significant for a ribsome

Summary Ultracentrifugation was necessary to identify and ribosomes, and characterize them on the basis of their size. The method does not allow an absolute measurement of molecular mass, but uses a ...
David's user avatar
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2 votes

Why is the outer circle of human mitochondrial DNA ‘heavy’, whereas the inner circle is ‘light’?

The heavy strand is literally heavier than the light strand. The first, or at least one of the first, observations of this phenomenon was in this paper: Corneo G, Zardi L, Polli E. 1968. Human ...
canadianer's user avatar
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2 votes
Accepted

How do peroxisomes work?

1. Let's first look into the relation of lipid biosynthesis and peroxisomes - According to this article, the main functions of peroxisomes are- As you can see most of the pathways that occur are ...
biologist_Jaishree's user avatar
2 votes

Does the cytoplasm include the organelles?

It's going to depend on what definition is useful in what context. If was was talking about an mRNA being translated in the cytoplasm, I am saying it is absolutely not translated in the ER or the ...
swbarnes2's user avatar
  • 5,230
2 votes

How does the Endoplasmic Reticulum scale with Cell Volume in Epithelial Cells?

Please consider this "answer" as an enlarged comment. I can't answer your question, but it's possible that my speculations or considerations could be helpful in your particular situation, in ...
KaPy3141's user avatar
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1 vote

Does cytoplasmic streaming cause passive organelle movement in animal or fungi cells?

If you look at http://en.wikipedia.org/wiki/Melanosome you will see an example of this organelle being transported in animal cells. Is this what you mean? or are you looking for unbound organelles ...
Polypipe Wrangler's user avatar
1 vote
Accepted

Does cytoplasmic streaming cause passive organelle movement in animal or fungi cells?

I believe that fungi use cytoplasmic streaming to transport organelles to the tips of their hyphae to extend them. I haven't heard of cytoplasmic streaming in animal cells but it might exist.
selenocysteine's user avatar
1 vote

Is ribosome denser and smaller than nucleus. Also sone relations in centrifugation related to size and density

I think that the higher speeds necessary to collect ribosomes by ultracentrifugation are likely to disrupt the nucleus. See for example this extract from a well known textbook: This treatment ...
Maximilian Press's user avatar
1 vote

Do larger unicellular eukaryotic organisms have larger organelles?

The cell has the amount of organelles necessary to perform its function. If a cell requires a lot of protein, it must have multiple nuclei to produce this protein. If the cell performs many activities ...
Nataly Sobrinho's user avatar
1 vote

Does Rough ER (RER) produce phospholipids?

The endoplasmic reticulum (ER) is one of the largest continuous membrane bound organelle of the cell. The rough ER and smooth ER share the same membrane and some membrane proteins can diffuse ...
Dr. H. Lecter's user avatar
1 vote

Is centrosome one of the structures that red blood cells lose during maturation process?

I was aware that mature red blood cells (RBCs) lose their nucleus, ER and Golgi apparatus. However, I wasn't sure about the centrosome! Centrosomes, being MTOCs (microtubule organising centers), have ...
S Pr's user avatar
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1 vote

Why is sedimentation rate significant for a ribsome

The Svedberg unit is measurement used to characterize the ribosomal subunits. And it represents rate of sedimentation in centrifugation process instead of size. But every organelle and sub-cellular ...
Twinkle Sheen's user avatar
1 vote
Accepted

Univocal identifying of a plant cell

Your teacher is right, chloroplasts and vacuoles are not sufficient to define a plant cell. Amoeba have both chloroplasts (McFadden et al, PNAS, 1994) and vacuoles (Day, J. Morphology, 1927) but they ...
Mowgli's user avatar
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1 vote

Is this sentence about RER correct on Wikipedia?

As stated in a comment, your understanding of protein translation in eukaryotes is not accurate. In order to provide a concrete reference that isn't wikipedia, I'll quote here from Biochemistry (2nd ...
bjarchi's user avatar
  • 115
1 vote

How does the peptidoglycan layer of a bacterial cell wall help prevent osmotic lysis?

Peptidoglycan is formed by the linkage of molecules of NAM ( N-acetylmuramic acid) and NAG (N-acetylglucosamine) into a polysaccharide structure. Many of these structures are then formed into a ...
active learner's user avatar

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