What are all the activities of a cell directed by? Directs cell activities? Guides all cell activities? Part of an animal cell that controls the cell's activities? What is the control of cell activities? Which cell controls the activities of the cell? What does cell nucleus do for a plant cell? The function of the nucleus in an amimal cell? Describe the role of the nucleus in the cell? What does a nucleus in a plant cell do?
Why does every plant cell have a nucleus? What structure directs the activities of a cell? What is the information center and activities director of the cell? What part of the cell directs all cell activities contains DNA? What part of a cell directs the activities of the cell? Which part of the cell controls cell activities? What is the cell part that directs the activities of the cell?
What is the function of the cell's nucleus? What does nucleus do for the cell? People also asked. Which structure makes proteind using coded instructions that come from the nucleus?
View results. What carry instructions for assembling proteins out of the nucleus? Which are the most responsible for carrying coded information from the nucleus?
How the contents of the nucleus help to carry out the control on the activities in a cell? Study Guides. Trending Questions. What is the fourth element of the periodic table of elements? Still have questions? Find more answers. The semifluid matrix found inside the nucleus is called nucleoplasm. Within the nucleoplasm, most of the nuclear material consists of chromatin, the less condensed form of the cell's DNA that organizes to form chromosomes during mitosis or cell division.
The nucleus also contains one or more nucleoli, organelles that synthesize protein-producing macromolecular assemblies called ribosomes, and a variety of other smaller components, such as Cajal bodies, GEMS Gemini of coiled bodies , and interchromatin granule clusters.
Chromatin and Chromosomes - Packed inside the nucleus of every human cell is nearly 6 feet of DNA, which is divided into 46 individual molecules, one for each chromosome and each about 1. Packing all this material into a microscopic cell nucleus is an extraordinary feat of packaging. For DNA to function, it can't be crammed into the nucleus like a ball of string. Instead, it is combined with proteins and organized into a precise, compact structure, a dense string-like fiber called chromatin.
The Nucleolus - The nucleolus is a membrane-less organelle within the nucleus that manufactures ribosomes, the cell's protein-producing structures. Through the microscope, the nucleolus looks like a large dark spot within the nucleus.
A nucleus may contain up to four nucleoli, but within each species the number of nucleoli is fixed. After a cell divides, a nucleolus is formed when chromosomes are brought together into nucleolar organizing regions.
During cell division, the nucleolus disappears. Some studies suggest that the nucleolus may be involved with cellular aging and, therefore, may affect the senescence of an organism. The Nuclear Envelope - The nuclear envelope is a double-layered membrane that encloses the contents of the nucleus during most of the cell's lifecycle.
The space between the layers is called the perinuclear space and appears to connect with the rough endoplasmic reticulum. The envelope is perforated with tiny holes called nuclear pores. These pores regulate the passage of molecules between the nucleus and cytoplasm, permitting some to pass through the membrane, but not others. The inner surface has a protein lining called the nuclear lamina, which binds to chromatin and other nuclear components. The nucleolus is the site where the subunits of ribosomes are manufactured.
Surrounding the nucleus is a double membrane called the nuclear envelope. The nuclear envelope is studded all over with tiny openings called nuclear pores.
The nucleus directs all cellular activities by controlling the synthesis of proteins. The nucleus contains encoded instructions for the synthesis of proteins in a helical molecule called deoxyribonucleic acid DNA.
0コメント