Table of Contents
- 1 What goes in and out of the nucleus?
- 2 What liquid fills the nucleus?
- 3 What organelle regulates transport for nucleus?
- 4 Does the nucleus contain water?
- 5 What provides pathway for distribution of materials?
- 6 What is the position of nucleus in plant cell?
- 7 How does the nucleus send commands to the cell?
- 8 How are nuclear proteins transported to the nucleus?
What goes in and out of the nucleus?
The Nucleus It contains most of the genetic material (the DNA) of the cell. The nucleus is surrounded by the nuclear envelope, a double membrane (two phospholipid bilayers) that controls what goes in and out of the nucleus. The nucleus also has holes embedded in the nuclear envelope.
What liquid fills the nucleus?
Nucleoplasm
Nucleoplasm is the fluid inside the nucleus that contains ions, dissolved nucleotides and other chemicals essential to cell growth.
What organelle regulates transport for nucleus?
Function Of Cell Organelles
| A | B |
|---|---|
| endoplasmic reticulum | serves as a pathway for the transport of materials throughout the cell |
| nucleus | serves as the control center for cell metabolism and reproduction |
| ribosomes | site of protein synthesis |
| mitochondria | power house of cell, releases energy into the cell |
How do transcription factors enter the nucleus?
Most transcription factors are located in the cytoplasm. After receiving a signal from the cell membrane signal transduction, transcription factors are activated and then translocated from the cytoplasm into the nucleus where they interact with the corresponding DNA frame (cis-acting elements).
What goes in a nucleus?
The nucleus is an organelle found in eukaryotic cells. Inside its fully enclosed nuclear membrane, it contains the majority of the cell’s genetic material. This material is organized as DNA molecules, along with a variety of proteins, to form chromosomes.
Does the nucleus contain water?
Nuclei of the 4 species studied contain 74-85% water while cytoplasm is only 35-50% water. Nuclei contain 7-17 µequiv. K/ml H2O; cytoplasm contains 59-84 µequiv.
What provides pathway for distribution of materials?
(i) Endoplasmic Reticulum (ER): Inside the cell, there exists a membranous network enclosing a fluid-filled lumen that almost filled the intracellular cavity. ER forms supporting skeletal framework of the cell and also provides a pathway for the distribution of nuclear material from one cell to another.
What is the position of nucleus in plant cell?
The nucleus of a plant cell is in the cytoplasm with the centre of the cell often occupied by the vacuole. A section through a cell may show the nucleus at the side, or it might appear in the centre of the cell if the section was of the “edge” of a cell.
How does water travel through the cell walls?
Along the way, water travels in cell walls (apoplastic pathway) and/or through the inside of cells (cell to cell pathway, C-C) (Steudle 2001). At the endodermis, the apoplastic pathway is blocked by a gasket-like band of suberin — a waterproof substance that seals off the route of water in the apoplast forcing water to cross via the C-C pathway.
Where does Walter the water molecule go on his journey?
Walter the Water Molecule Take a Journey Through the Water Cycle. The Catskill Creek takes Walter to the Hudson River, and he notices that the Hudson behaves oddly for a river. Its current keeps reversing direction. Twice each day it flows back towards the mountains.
How does the nucleus send commands to the cell?
The nucleus sends “commands” to the cell via molecular messengers that translate the information from DNA. Each cell in your body (with the exception of germ cells) contains the complete set of your DNA.
How are nuclear proteins transported to the nucleus?
The import of nuclear proteins through the pore complex concentrates specific proteins in the nucleus, thereby increasing order in the cell, which must consume energy (discussed in Chapter 2). The energy is thought to be provided by the hydrolysis of GTP by the monomeric GTPase Ran.