- Which of the following are rod shaped bodies close to the nucleus?
- What are the 4 major functions of the nucleus?
- What is the double membrane that encloses the nucleus?
- Why nuclear membrane is double layered?
- Why is it called nuclear envelope?
- What is the advantage of a nucleus?
- What is unique about the nuclear envelope?
- Which is continuous with the outer layer of the nuclear envelope?
- Are nuclear envelopes found in prokaryotic cells?
- What cell do not have a nucleus?
- What connects the two layers of the nuclear envelope?
- Can Mrna pass through nuclear pores?
- Can DNA pass through nuclear pores?
- Is the nucleus the site of protein assembly?
membranous sustem consisting of flattened sacs and vesicles; packages proteins for export. attached to membrane systems or scattered in the cytoplasm; synthesize proteins.
Which of the following are rod shaped bodies close to the nucleus?
Cell Structure
| A | B |
|---|---|
| two rod-shaped bodies near the nucleus; “spin” the mitotic spindle in cell division | centrioles |
| dense darkly-stained nuclear body; possible packaging site for ribosomes | nucleolus |
| attached to membrane system involved in transport of proteins within the cell | endoplasmic reticulum |
What are the 4 major functions of the nucleus?
Namely, these functions are:
- control of the genetical information of the cell and thus the heredity characteristics of an organism,
- control of the protein and enzyme synthesis.
- control of cell division and cell growth.
- storage of DNA, RNA and ribosome.
- regulation of the transcription of the mRNA to protein.
What is the double membrane that encloses the nucleus?
nuclear membrane
Why nuclear membrane is double layered?
The nuclear envelope is a double-layered membrane that encloses the contents of the nucleus during most of the cell’s lifecycle. These pores regulate the passage of molecules between the nucleus and cytoplasm, permitting some to pass through the membrane, but not others.
Why is it called nuclear envelope?
The nuclear envelope, also known as the nuclear membrane, is made up of two lipid bilayer membranes that in eukaryotic cells surrounds the nucleus, which encases the genetic material. The nuclear envelope consists of two lipid bilayer membranes: an inner nuclear membrane and an outer nuclear membrane.
What is the advantage of a nucleus?
Explanation: As the DNA is present in the nucleus, there is compartmentalisation and the process becomes more efficient without the interaction of external bodies. The membrane of the nucleus protects the DNA from injuries.
What is unique about the nuclear envelope?
The nuclear envelope (NE) is a highly regulated membrane barrier that separates the nucleus from the cytoplasm in eukaryotic cells. It contains a large number of different proteins that have been implicated in chromatin organization and gene regulation.
Which is continuous with the outer layer of the nuclear envelope?
The outer nuclear membrane is continuous with the endoplasmic reticulum, so the space between the inner and outer nuclear membranes is directly connected with the lumen of the endoplasmic reticulum.
Are nuclear envelopes found in prokaryotic cells?
In prokaryotes, the DNA (chromosome) is in contact with the cellular cytoplasm and is not in a housed membrane-bound nucleus. In eukaryotes, however, the DNA takes the form of compact chromosomes separated from the rest of the cell by a nuclear membrane (also called a nuclear envelope).
What cell do not have a nucleus?
Prokaryotes
What connects the two layers of the nuclear envelope?
nuclear lamina
Can Mrna pass through nuclear pores?
mRNAs are exported through the nuclear pore complexes (NPCs), the nanochannels that perforate the nuclear envelope (NE) and primarily act as a gateway for transport of various types of cargos (including mRNAs) into and out of the nucleus (see [3. The Nuclear Pore Complex as a Flexible and Dynamic Gate. Cell.
Can DNA pass through nuclear pores?
Conclusions. We have established that nuclear uptake of DNA can take place by linear passage through nuclear pores, and that this import depends on a biochemistry distinct from that governing active protein import.
Is the nucleus the site of protein assembly?
The nucleus (plural, nuclei) houses the cell’s genetic material, or DNA, and is also the site of synthesis for ribosomes, the cellular machines that assemble proteins.