Questions tagged [organelle]

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48 views

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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0answers
45 views

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 ...
2
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1answer
197 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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0answers
29 views

How is it possible for a cell to have hundreds or thousands of microtubules?

A centriole has only 9 sets of 3 microtubules thus giving 27 microtubules per centriole, or 54 microtubules per centrosome. The maximum number of microtubules in a cell due to centrosomes will thus be ...
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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 ...
3
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1answer
57 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
164 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
137 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
264 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
274 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
13k 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
273 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 ...
-2
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1answer
1k 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-...
4
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1answer
2k views

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 ...
2
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2answers
2k views

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 ...