Questions tagged [organelle]

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Do larger unicellular eukaryotic organisms have larger organelles?

It seems that many of the giant unicellular eukaryotic organisms (size 1mm and above) are multinucleate but there are some with a single nucleus as well (the genus of Acetabularia). My question is: do ...
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1answer
31 views

Does Rough ER (RER) produce phospholipids?

I have found out that rough endoplasmic reticulum (RER) produces membranes. Therefore it has to produce phospholipids, but I thought that the smooth ER was where the synthesis of lipids occurs. What ...
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2answers
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Why is sedimentation rate significant for a ribsome

When we take a look at biology textbooks (Campbell, Pearson etc), they will only mention the difference between eukaryotic and prokaryotic ribosome sedimentation rates. Why is sedimentation rate ...
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Where is catalase produced?

I am doing a research project on the peroxisomes, and in it I referenced the enzyme catalase, which breaks down hydrogen peroxide into water and oxygen. However, the assignment asks me to specify the ...
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1answer
451 views

What will happen if mitochondria had a structure like lysosomes?

I wanted to know an explanation how the structure of mitochondria affects its function. Therefore, how would it turn out if its structure is like the structure of lysosomes, what is going to happen?
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1answer
26 views

Univocal identifying of a plant cell

We yesterday got our biology-exams back and there's one exercise where I don't agree with my teacher. However, since he is the expert and not me, I need the support of external sources, i.e. experts ...
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1answer
64 views

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

It is known that many viruses (e.g. retroviridae) integrate in the nuclear genome of their host as part of their cycle. However, I'd like to know if integration can happen in organellar DNA (cpDNA and ...
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1answer
177 views

Is this sentence about RER correct on Wikipedia?

While studying about Endoplasmic Reticulum on Wikipedia, I came across this sentence A ribosome only binds to the RER once a specific protein-nucleic acid complex forms in the cytosol. This special ...
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1answer
155 views

Why is the rough ER necessary to make extracellular proteins? [closed]

It is my current understanding that free ribosomes synthesise proteins to be used inside the cell, and the rough endoplasmic reticulum is necessary to make proteins that are to be secreted by the cell....
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1answer
318 views

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

Why is the outer circle of human mitochondrial DNA "heavy" whereas the inner circle is "light"?
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1answer
289 views

How do plant cell vacuoles form?

Does the plant cell vacuole form by the invagination of the cell membrane?
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1answer
288 views

Which two organelles absorb acid? [closed]

I stain an unknown acid with purple dye. Later, you find the cell in two organelles. What are they? I am guessing that one of them is lysosomes, because they break down unwanted elements. What would ...
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1answer
15k views

Do Archaea have membrane-bound organelles?

From Campbell Ch. 6 Intro to the Cell, Which of the following statements concerning bacteria and archaea cells is correct? A) Archaea cells contain small membrane-enclosed organelles; bacteria do ...
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1answer
2k views

Which organelle is the easiest to see in a cell? [closed]

I was asked a question in class: "Which organelles are easiest to see in any cells while using a microscope?" This seems a little bit like a trick question, and since I'm not an expert in cellular ...
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2answers
2k views

Why is it said that bacteria have no membrane-bound organelles, when they often have one or more flagella?

Why is it said that bacteria have no membrane-bound organelles, when they often have one or more flagella? https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3386205/ "Cilia and flagella .. are membrane-...
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Why do ribosomes associate with rough endoplasmic reticulum but not other membranes?

As far as I am aware, all eukaryotic membranes consist of a lipid bilayer. Smooth endoplasmic reticulum (ER) and rough ER are distinguished by the presence of ribosome on the rough ER surface, but are ...
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2answers
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How does the peptidoglycan layer of a bacterial cell wall help prevent osmotic lysis? [duplicate]

I recently read that penicillin works by damaging the peptidoglycan layers of a bacterial cell wall causing osmotic lysis, which is when the bacteria cell bursts due to osmotic pressure. I just ...