A Distinct and Parallel Pathway for the Nuclear Import of an mRNA
... RNAs represent a major class of macromolecules exported from the nucleus. Maturation of mRNA is a prerequisite for its export into the cytoplasm. Before its export, mRNA is packaged and undergoes such modifications as splicing, polyadenylation, and capping (for review see Dreyfuss et al., 1993; Naki ...
... RNAs represent a major class of macromolecules exported from the nucleus. Maturation of mRNA is a prerequisite for its export into the cytoplasm. Before its export, mRNA is packaged and undergoes such modifications as splicing, polyadenylation, and capping (for review see Dreyfuss et al., 1993; Naki ...
Name
... Bacteria are unicellular and are covered with a thick outer cell wall. Color and label the cell wall PURPLE. Just within the cell wall is the cell membrane. Color and label the cell membrane PINK. Along the surface of some bacteria are structures called pili (pilus-singular) that help bacteria adhe ...
... Bacteria are unicellular and are covered with a thick outer cell wall. Color and label the cell wall PURPLE. Just within the cell wall is the cell membrane. Color and label the cell membrane PINK. Along the surface of some bacteria are structures called pili (pilus-singular) that help bacteria adhe ...
What is a cell?
... Most plants and animals are multicellular. The human body is made up of around 200 different types of cell, all working together. Most cells are specialized, meaning that each type of cell has a specific structure and function. All cells with a nucleus contain the same genes, but different cells act ...
... Most plants and animals are multicellular. The human body is made up of around 200 different types of cell, all working together. Most cells are specialized, meaning that each type of cell has a specific structure and function. All cells with a nucleus contain the same genes, but different cells act ...
Cell Project
... Make a three-dimensional model of a plant or animal cell. Identify the type of cell (plant or animal). Include all the appropriate organelles listed above that are appropriate for your type of cell. Use whatever materials you like (Styrofoam, wood, clay, beads, pipe-cleaners etc.) Be creative!!! The ...
... Make a three-dimensional model of a plant or animal cell. Identify the type of cell (plant or animal). Include all the appropriate organelles listed above that are appropriate for your type of cell. Use whatever materials you like (Styrofoam, wood, clay, beads, pipe-cleaners etc.) Be creative!!! The ...
Nucleocytoplasmic transport
... cytoplasmic binding are relevant to the establishment of intracellular distributions. In these cases, nucleocytoplasmic transport is not simply a matter of crossing a barrier (the nuclear envelope) through specific channels (pore-complexes) between two aqueous compartments. It is more likely to be a ...
... cytoplasmic binding are relevant to the establishment of intracellular distributions. In these cases, nucleocytoplasmic transport is not simply a matter of crossing a barrier (the nuclear envelope) through specific channels (pore-complexes) between two aqueous compartments. It is more likely to be a ...
Chapter 15
... • A mitotic chromosome consists of two sister chromatids held together by cohesive forces. • Ubiquitin-mediated proteolysis drives the release of sister chromatid cohesion and marks the onset of anaphase. • The anaphase promoting complex or cyclosome (APC/C) is the E3 ubiquitin ligase that directs p ...
... • A mitotic chromosome consists of two sister chromatids held together by cohesive forces. • Ubiquitin-mediated proteolysis drives the release of sister chromatid cohesion and marks the onset of anaphase. • The anaphase promoting complex or cyclosome (APC/C) is the E3 ubiquitin ligase that directs p ...
Chapter 6 Notes
... • In the nucleus, DNA is organized into discrete units called chromosomes • Each chromosome is composed of a single DNA molecule associated with proteins • The DNA and proteins of chromosomes are together called chromatin • Chromatin condenses to form discrete chromosomes as a cell prepares to divi ...
... • In the nucleus, DNA is organized into discrete units called chromosomes • Each chromosome is composed of a single DNA molecule associated with proteins • The DNA and proteins of chromosomes are together called chromatin • Chromatin condenses to form discrete chromosomes as a cell prepares to divi ...
Tutorial 8 – Cytoskeleton
... Intermediate Filaments FUNCTION: “provide a supporting framework within the cell” These supportive fibers provide for mechanical reinforcement of tissues and range in diameter from 8-10 nm ...
... Intermediate Filaments FUNCTION: “provide a supporting framework within the cell” These supportive fibers provide for mechanical reinforcement of tissues and range in diameter from 8-10 nm ...
Expression patterns of genes encoding endomembrane proteins
... similarity to BP-80 isoforms from Arabidopsis, pea and pumpkin plants. In this paper it is shown that the relative expression level of the three genes, as deduced from Northern blot analyses, support previous microscopic observations (Levanony et al., 1992) that the Golgi has a reduced role in the d ...
... similarity to BP-80 isoforms from Arabidopsis, pea and pumpkin plants. In this paper it is shown that the relative expression level of the three genes, as deduced from Northern blot analyses, support previous microscopic observations (Levanony et al., 1992) that the Golgi has a reduced role in the d ...
unit-4-notes-cell-membranes
... high concentration to an area of low concentration. – Diffusion often requires a membrane in living things. – For example, oxygen gas moves outside of the cell to the inside of the cell to be used for cellular respiration. – The mitochondria use the oxygen gas when it is within the cell, thus creati ...
... high concentration to an area of low concentration. – Diffusion often requires a membrane in living things. – For example, oxygen gas moves outside of the cell to the inside of the cell to be used for cellular respiration. – The mitochondria use the oxygen gas when it is within the cell, thus creati ...
Slide 1 (Early Prophase): What is interphase often
... Many plants and shrubs are propagated this way. In each case the new plants are just like the parent plants because in each cell there is a mechanism that operates to maintain the hereditary pattern from one cell to its daughter cells. The process by which this occurs is known as cell division, or m ...
... Many plants and shrubs are propagated this way. In each case the new plants are just like the parent plants because in each cell there is a mechanism that operates to maintain the hereditary pattern from one cell to its daughter cells. The process by which this occurs is known as cell division, or m ...
Bacteria Lab
... Bacteria are among the smallest cells on earth. These tiny cells lack membranebound organelles such as a nucleus. Because bacteria have no nucleus, they are prokaryotes, and they are classified into kingdom Monera (Prokaryotae). Bacteria can be identified based on their cell shape and arrangement. T ...
... Bacteria are among the smallest cells on earth. These tiny cells lack membranebound organelles such as a nucleus. Because bacteria have no nucleus, they are prokaryotes, and they are classified into kingdom Monera (Prokaryotae). Bacteria can be identified based on their cell shape and arrangement. T ...
Cells and Tissues Part 1
... Cells are the building blocks of all living things Tissues are groups of cells that are similar in structure and ...
... Cells are the building blocks of all living things Tissues are groups of cells that are similar in structure and ...
Plasma Membrane Notes (7.2)
... materials entering & exiting the cell. Their ability to maintain this balance is called homeostasis. It is important for a cell to control internal & external concentrations of water, glucose, & other nutrients, while eliminating cellular wastes. ...
... materials entering & exiting the cell. Their ability to maintain this balance is called homeostasis. It is important for a cell to control internal & external concentrations of water, glucose, & other nutrients, while eliminating cellular wastes. ...
Membrane Transport Animations
... Because some molecules needed by the cell cannot be supplied by simple or facilitated diffusion. 24. Explain the difference between Passive and Active Transport. Passive transport requires no energy from the cell because molecules are moving down the concentration gradient. Active transport requires ...
... Because some molecules needed by the cell cannot be supplied by simple or facilitated diffusion. 24. Explain the difference between Passive and Active Transport. Passive transport requires no energy from the cell because molecules are moving down the concentration gradient. Active transport requires ...
Cell Shapes
... • All organisms composed of cells and cell products. • A cell is the simplest structural and functional unit of life. There are no smaller subdivisions of a cell or organism that, in themselves, are alive. • An organism’s structure and all of its functions are ultimately due to the activities of its ...
... • All organisms composed of cells and cell products. • A cell is the simplest structural and functional unit of life. There are no smaller subdivisions of a cell or organism that, in themselves, are alive. • An organism’s structure and all of its functions are ultimately due to the activities of its ...
Chapter 4 - 4.2PowerPoint
... • Microtubules – hollow tubes that give cells shape. • Microfilaments – tiny thread like proteins that enable cells to move and divide. (important in muscle cell contraction an relaxation) ...
... • Microtubules – hollow tubes that give cells shape. • Microfilaments – tiny thread like proteins that enable cells to move and divide. (important in muscle cell contraction an relaxation) ...
viral_replic_Hammer
... • Viruses are obligate intracellular parasites • Viruses carry their genome (RNA or DNA) and sometimes functional proteins required for early steps in replication cycle • Viruses depend on host cell machinery to complete replication cycle and must commandeer that machinery to successfully replicate ...
... • Viruses are obligate intracellular parasites • Viruses carry their genome (RNA or DNA) and sometimes functional proteins required for early steps in replication cycle • Viruses depend on host cell machinery to complete replication cycle and must commandeer that machinery to successfully replicate ...
Cell Transport
... When combined with chloride, the resulting substance is table salt. Excess sodium (such as that obtained from dietary sources) is excreted in the urine. It regulates the total amount of water in the body and the transmission of sodium into and out of individual cells also plays a role in critical bo ...
... When combined with chloride, the resulting substance is table salt. Excess sodium (such as that obtained from dietary sources) is excreted in the urine. It regulates the total amount of water in the body and the transmission of sodium into and out of individual cells also plays a role in critical bo ...
Cell nucleus
In cell biology, the nucleus (pl. nuclei; from Latin nucleus or nuculeus, meaning kernel) is a membrane-enclosed organelle found in eukaryotic cells. Eukaryotes usually have a single nucleus, but a few cell types have no nuclei, and a few others have many.Cell nuclei contain most of the cell's genetic material, organized as multiple long linear DNA molecules in complex with a large variety of proteins, such as histones, to form chromosomes. The genes within these chromosomes are the cell's nuclear genome. The function of the nucleus is to maintain the integrity of these genes and to control the activities of the cell by regulating gene expression—the nucleus is, therefore, the control center of the cell. The main structures making up the nucleus are the nuclear envelope, a double membrane that encloses the entire organelle and isolates its contents from the cellular cytoplasm, and the nucleoskeleton (which includes nuclear lamina), a network within the nucleus that adds mechanical support, much like the cytoskeleton, which supports the cell as a whole.Because the nuclear membrane is impermeable to large molecules, nuclear pores are required that regulate nuclear transport of molecules across the envelope. The pores cross both nuclear membranes, providing a channel through which larger molecules must be actively transported by carrier proteins while allowing free movement of small molecules and ions. Movement of large molecules such as proteins and RNA through the pores is required for both gene expression and the maintenance of chromosomes. The interior of the nucleus does not contain any membrane-bound sub compartments, its contents are not uniform, and a number of sub-nuclear bodies exist, made up of unique proteins, RNA molecules, and particular parts of the chromosomes. The best-known of these is the nucleolus, which is mainly involved in the assembly of ribosomes. After being produced in the nucleolus, ribosomes are exported to the cytoplasm where they translate mRNA.