Elite QandA


Where in the cell is the endoplasmic reticulum located?


  1. Where in the cell is the endoplasmic reticulum located?
  2. What are the components of endoplasmic reticulum?
  3. What is the structure of smooth endoplasmic reticulum?
  4. What are the 3 main functions of the endoplasmic reticulum?
  5. What does endoplasmic reticulum look like?
  6. How do proteins enter the endoplasmic reticulum?
  7. What does the smooth ER look like?
  8. What is rough and smooth endoplasmic reticulum?
  9. Which component is not found in the composition of endoplasmic reticulum?
  10. How does the endoplasmic reticulum work?
  11. Why does endoplasmic reticulum look bumpy?
  12. What does smooth ER look like?
  13. What does rough ER look like?
  14. Where is the rough and smooth endoplasmic reticulum located?
  15. What is difference between smooth ER and rough ER?
  16. What proteins are made in the rough ER?
  17. What binds to the ER signal sequence?
  18. Where do proteins go after they are made on the endoplasmic reticulum?
  19. How does endoplasmic reticulum look like?
  20. How does the smooth ER make lipids?
  21. What does the ER look like?
  22. Where is the smooth and rough ER located?
  23. What is smooth ER and rough ER?
  24. Where is the ER signal sequence?
  25. Where is the ER targeting signal sequence?
  26. Do all proteins go to the endoplasmic reticulum?
  27. Why are ribosomes on the rough ER?
  28. What is the smooth and rough endoplasmic reticulum?
  29. Where is the smooth ER located in an animal cell?
  30. What does the smooth ER break down?
  31. What does ribosomes look like?

Where in the cell is the endoplasmic reticulum located?

The endoplasmic reticulum (ER) is a network of membrane-enclosed tubules and sacs (cisternae) that extends from the nuclear membrane throughout the cytoplasm (Figure 9.1). The entire endoplasmic reticulum is enclosed by a continuous membrane and is the largest organelle of most eukaryotic cells.

What are the components of endoplasmic reticulum?

The ER consists of the nuclear envelope and the peripheral ER, which includes smooth tubules and rough sheets. While the ER is defined as an interconnected network with a continuous membrane, the different structures that make up the ER perform very diverse and specialized functions within the cell.

What is the structure of smooth endoplasmic reticulum?

The smooth endoplasmic reticulum comprises tube-like structure located near the cell periphery. These tubules or tubes sometimes branch forming a network that is reticular in appearance. The network of smooth endoplasmic reticulum allows for an increased surface area to be devoted to storage of key enzymes.

What are the 3 main functions of the endoplasmic reticulum?

The endoplasmic reticulum (ER) serves important functions particularly in the synthesis, folding, modification, and transport of proteins.

What does endoplasmic reticulum look like?

Rough ER looks like sheets or disks of bumpy membranes while smooth ER looks more like tubes. Rough ER is called rough because it has ribosomes attached to its surface. The double membranes of smooth and rough ER form sacs called cisternae. Protein molecules are synthesized and collected in the cisternal space/lumen.

How do proteins enter the endoplasmic reticulum?

Proteins are fed into the ER during translation if they have an amino sequence called a signal peptide. In general, proteins bound for organelles in the endomembrane system (such as the ER, Golgi apparatus, and lysosome) or for the exterior of the cell must enter the ER at this stage.

What does the smooth ER look like?

Rough and Smooth. There are two basic types of ER. Rough ER looks like sheets or disks of bumpy membranes while smooth ER looks more like tubes. Rough ER is called rough because it has ribosomes attached to its surface.

What is rough and smooth endoplasmic reticulum?

Quick look. Rough ER (RER) is involved in some protein production, protein folding, quality control and despatch. It is called 'rough' because it is studded with ribosomes. Smooth E R (SER) is associated with the production and metabolism of fats and steroid hormones.

Which component is not found in the composition of endoplasmic reticulum?

The rough endoplasmic reticulum is especially prominent in cells such as hepatocytes. The smooth endoplasmic reticulum lacks ribosomes and functions in lipid synthesis but not metabolism, the production of steroid hormones, and detoxification.

How does the endoplasmic reticulum work?

Endoplasmic reticulum is a network of membranes inside a cell through which proteins and other molecules move. Proteins are assembled at organelles called ribosomes. Smooth endoplasmic reticulum lacks ribosomes and helps synthesize and concentrate various substances needed by the cell.

Why does endoplasmic reticulum look bumpy?

Explanation: The rough endoplasmic reticulum (ER) is called 'rough' because it has organelles called ribosomes attached to the surface. Ribosomes are the organelles that turn mRNA into proteins. These proteins are initially long strings of amino acids.

What does smooth ER look like?

Rough and Smooth. There are two basic types of ER. Rough ER looks like sheets or disks of bumpy membranes while smooth ER looks more like tubes. Rough ER is called rough because it has ribosomes attached to its surface.

What does rough ER look like?

Rough ER looks like sheets or disks of bumpy membranes while smooth ER looks more like tubes. Rough ER is called rough because it has ribosomes attached to its surface. The double membranes of smooth and rough ER form sacs called cisternae. The sarcoplasmic reticulum (SR) is a variation of the SER.

Where is the rough and smooth endoplasmic reticulum located?

The rough endoplasmic reticulum is mostly found around the nuclear membrane. The smooth endoplasmic reticulum is mostly found near the cell membrane.

What is difference between smooth ER and rough ER?

The main difference between these two terminologies is that the Smooth Endoplasmic Reticulum is known for stocking the lipids and proteins. It is not bounded by ribosomes. Whereas, the Rough Endoplasmic Reticulum is bounded by the ribosomes and also stores proteins.

What proteins are made in the rough ER?

Proteins synthesized by the rough ER include the prominent milk protein casein, and whey proteins. These proteins are packaged into secretory vesicles or large micelles and travel through the Golgi network before fusing with the plasma membrane, releasing their contents into milk ducts.

What binds to the ER signal sequence?

The ER signal sequence is guided to the ER membrane by at least two components: a signal-recognition particle (SRP), which cycles between the ER membrane and the cytosol and binds to the signal sequence, and an SRP receptor in the ER membrane.

Where do proteins go after they are made on the endoplasmic reticulum?

From Rough ER to Golgi In most cases proteins are transferred to the Golgi apparatus for 'finishing'. They are conveyed in vesicles or possibly directly between the ER and Golgi surfaces.

How does endoplasmic reticulum look like?

Rough ER looks like sheets or disks of bumpy membranes while smooth ER looks more like tubes. Rough ER is called rough because it has ribosomes attached to its surface. The double membranes of smooth and rough ER form sacs called cisternae. Protein molecules are synthesized and collected in the cisternal space/lumen.

How does the smooth ER make lipids?

The smooth endoplasmic reticulum plays a major role in synthesizing lipids by means of enzymes embedded in these smooth membranes. In the reproductive organs, smooth ER in the cells produces the steroid hormones testosterone and estrogen.

What does the ER look like?

Rough ER looks like sheets or disks of bumpy membranes while smooth ER looks more like tubes. Rough ER is called rough because it has ribosomes attached to its surface. The double membranes of smooth and rough ER form sacs called cisternae. Smooth ER (SER) acts as a storage organelle.

Where is the smooth and rough ER located?

The rough endoplasmic reticulum is mostly found around the nuclear membrane. The smooth endoplasmic reticulum is mostly found near the cell membrane.

What is smooth ER and rough ER?

Both rough ER and smooth ER have the same types of membranes but they have different shapes. Rough ER looks like sheets or disks of bumpy membranes while smooth ER looks more like tubes. Rough ER is called rough because it has ribosomes attached to its surface. Smooth ER (SER) acts as a storage organelle.

Where is the ER signal sequence?

The sequence of amino acids located at the amino terminus of secreted and type I membrane proteins directs the nascent polypeptide chain to the ER membrane. The signal sequence is removed cotranslationally by a signal peptidase located within the ER lumen.

Where is the ER targeting signal sequence?

The ribosome and its attached nascent peptide become targeted to the endoplasmic reticulum. Targeting to the endoplasmic reticulum takes place through the interaction of the signal peptide sequence ( a sequence of at least eight hydrophobic amino acids at the amino terminal end of the polypeptide.

Do all proteins go to the endoplasmic reticulum?

In addition, a major portion of the cell's protein synthesis occurs on the cytosolic surface of the ER: all proteins destined for secretion and all proteins destined for the ER itself, the Golgi apparatus, the lysosomes, the endosomes, and the plasma membrane are first imported into the ER from the cytosol.

Why are ribosomes on the rough ER?

Endoplasmic reticulum is a network of membranes inside a cell through which proteins and other molecules move. When proteins are destined to be part of the cell membrane or exported from the cell, the ribosomes assembling them attach to the endoplasmic reticulum, giving it a rough appearance.

What is the smooth and rough endoplasmic reticulum?

Smooth endoplasmic reticulum (SER) is a type of endoplasmic reticulum consisting of tubular vesicles that lack ribosomes on the outer surface and is involved in the synthesis and storage of lipids. Ribosomes. Rough ER has ribosomes on the outer surface. Smooth ER doesn' thave ribosomes on the outer surface.

Where is the smooth ER located in an animal cell?

cytoplasmsmooth endoplasmic reticulum (SER), meshwork of fine disklike tubular membrane vesicles, part of a continuous membrane organelle within the cytoplasm of eukaryotic cells, that is involved in the synthesis and storage of lipids, including cholesterol and phospholipids, which are used in the production of new cellular

What does the smooth ER break down?

Smooth Endoplasmic Reticulum Function Makes fats (lipids) Metabolizes (breaks down and builds up) carbohydrates (things like sugars or starches)

What does ribosomes look like?

A ribosome itself looks like a little hamburger bun. It's made of two subunits: a big one (the top bun) and a small one (the bottom bun). Eukaryotic ribosomes are found floating freely in the cytoplasm or attached to the rough endoplasmic reticulum (RER or rough ER for short).



Why is 73 the best number Sheldon Cooper?
What to do when she says thanks?
What does Shay Johnson do for a living?



Can VLOOKUP return blank?

When you use VLOOKUP to return a value from a data table, the function does not differentiate between blanks and zero values in what it returns. If the source value is zero, then VLOOKUP returns 0. Likewise, if the source is blank, then VLOOKUP still returns the value 0.


How do I lookup multiple values in Excel horizontally?

To get the multiple corresponding values horizontally, in one row, just make one change in the formula, by replacing "ROW(1:1)" to "COLUMN(A1)", and then copy the formula horizontally in the same row to the right columns, from Cell B11 to H11, in 7 columns (Refer Table 6).


How do I stop VLOOKUP from returning 0?

1:081:57Excel Magic Trick 1260 Re-Do: Prevent VLOOKUP from ReturningYouTubeStart of suggested clipEnd of suggested clipWe simply join a 0 length text string which is double quote double quote.MoreWe simply join a 0 length text string which is double quote double quote.




Elite QandA