• Study Resource
  • Explore
    • Arts & Humanities
    • Business
    • Engineering & Technology
    • Foreign Language
    • History
    • Math
    • Science
    • Social Science

    Top subcategories

    • Advanced Math
    • Algebra
    • Basic Math
    • Calculus
    • Geometry
    • Linear Algebra
    • Pre-Algebra
    • Pre-Calculus
    • Statistics And Probability
    • Trigonometry
    • other →

    Top subcategories

    • Astronomy
    • Astrophysics
    • Biology
    • Chemistry
    • Earth Science
    • Environmental Science
    • Health Science
    • Physics
    • other →

    Top subcategories

    • Anthropology
    • Law
    • Political Science
    • Psychology
    • Sociology
    • other →

    Top subcategories

    • Accounting
    • Economics
    • Finance
    • Management
    • other →

    Top subcategories

    • Aerospace Engineering
    • Bioengineering
    • Chemical Engineering
    • Civil Engineering
    • Computer Science
    • Electrical Engineering
    • Industrial Engineering
    • Mechanical Engineering
    • Web Design
    • other →

    Top subcategories

    • Architecture
    • Communications
    • English
    • Gender Studies
    • Music
    • Performing Arts
    • Philosophy
    • Religious Studies
    • Writing
    • other →

    Top subcategories

    • Ancient History
    • European History
    • US History
    • World History
    • other →

    Top subcategories

    • Croatian
    • Czech
    • Finnish
    • Greek
    • Hindi
    • Japanese
    • Korean
    • Persian
    • Swedish
    • Turkish
    • other →
 
Profile Documents Logout
Upload
Ch 7 Cell Homework Packet
Ch 7 Cell Homework Packet

... Fill in the chart with the missing vocab term or the definition. Term ...
8-25 and 8-26 Cells and Organelles
8-25 and 8-26 Cells and Organelles

Osmosis Practice Activity
Osmosis Practice Activity

... ________ Transport protein that provides a tube-like opening in the plasma membrane through which particles can diffuse ________ Is used during active transport but not passive transport ________ Process by which a cell takes in material by forming a vacuole around it ________ Particle movement from ...
Diffusion & Osmosis
Diffusion & Osmosis

... Passive Transport vs. Active Transport ...
Cell cycle - GEOCITIES.ws
Cell cycle - GEOCITIES.ws

... interphase. Cells during interphase may or may not be growing. At any given time, even in an area of rapid cell division such as the tip of a plant root, 90 percent of cells are in interphase. Some cells, such as nerve cells, can stay in interphase for decades. The cell grows and replicates its DNA ...
Lecture 2 - Microscopy and Cell Structure S11 2 slides per page
Lecture 2 - Microscopy and Cell Structure S11 2 slides per page

... – Serves as a selectively permeable barrier • Barrier between cell and external environment • Permits passage of only certain molecules, such as water, small hydrophobic molecules and gases ...
CH05_Lecture
CH05_Lecture

... less fluid than unsaturated fatty acids • “Kinks” introduced by the double bonds keep them from packing tightly • Most membranes also contain sterols such as cholesterol, which can either increase or decrease membrane fluidity, depending on the temperature ...
Single-celled Primary Producers
Single-celled Primary Producers

... – Plant-like - Bacillariophyta, Dinoflagellata, Chrysophyta – Animal-like – Foraminafera, Polycystina, Ciliophora Diversity of Primary Producers (graphic) Differences of Taxa (graphic) Size of Producers • Prokaryotes and Protista are single-celled • Range of sizes - some are so small they are diffic ...
Single-celled Primary Producers Diversity of Primary Producers
Single-celled Primary Producers Diversity of Primary Producers

... Contain chlorophyll a and phycocyanin; may also contain phycoerythrin (red) Produce oxygen In some, population blooms – Oscillatoria causes red for Red Sea • May aggregate to form strands or dense mats – Long strands of Lyngbya More Cyanobacteria • Reproduce by cell fission (usually) • Some are nitr ...
Anterior lobe
Anterior lobe

... • Summarize the structure of the cerebellar cortex • Identify the deep cerebellar nuclei and their connections. • List the afferent and efferent connections of the cerebellum and their arrangement in cerebellar peduncles. • Describe the major functions of the cerebellum and how each side of the cere ...
Reece9e_Lecture_C06
Reece9e_Lecture_C06

... Many of the internal membranes in a eukaryotic cell are part of the endomembrane system, which includes the nuclear envelope, endoplasmic reticulum, Golgi apparatus, lysosomes, vesicles, vacuoles, and plasma membrane. The tasks of the endomembrane system include synthesis of proteins and their trans ...
77KB - NZQA
77KB - NZQA

... Cellular transport processes are explained in terms of the properties of the substances transported. Range ...
An 83 kDa 0-GlcNAc-Glycoprotein Is Found in the Axoplasm and
An 83 kDa 0-GlcNAc-Glycoprotein Is Found in the Axoplasm and

... In previous studies, single O-linked N-acetylglucosamine (OGlcNAc) units were found on glycoproteins rapidly transported alongaxonsin the CNS ofA&iu culifornicu (Gabel et al., 1989) and also at growth cones of Aplysia neurons growing in vitro (Ambron et al., 1989). These were the first descriptions ...
INTRODUCTION TO THE CELL
INTRODUCTION TO THE CELL

... loop of DNA - cccDNA - and no chromatin proteins) 3. The nucleus contains the cell’s chromosomes (human, 46, fruit fly 6, fern 1260) which are normally uncoiled to form a chromatinic network, which contain both linear DNA and proteins, known as histones. These proteins coil up (dehydrate) at the sta ...
6 Tour of the Cell  II
6 Tour of the Cell II

... conversion of light energy to chemical food energy – They are food production factories and are found only in plants and some protists (algae & seaweed) ...
2. Bifidobacterium animalis- digestive regularity 3. E. Coli
2. Bifidobacterium animalis- digestive regularity 3. E. Coli

... itself and causes the cell to burst. Lysogenic infection- a virus embeds its DNA into the DNA of the host cell and replicates. ...
Trekking along the Cytoskeleton
Trekking along the Cytoskeleton

... data) and thus they demonstrate a novel level of motility. Because they are confined by the membrane of the ER, they must presumably interact, via yet-to-be characterized transmembrane linker proteins, with the cytoskeleton. The structure of the cortical ER as reported by high-resolution light micro ...
Comparing Plant cells and Animal cells Lab Report
Comparing Plant cells and Animal cells Lab Report

... ConclusionMy hypothesis was what are the similarities and differences between a plant cell and an animal cell. What I learned from my experience of looking into the microscope is that the structure of a plant cell is quite similar and different from the structure of a animal cell structure. Animal ...
Fişa disciplinei
Fişa disciplinei

... - Proteins – substrate of structure, properties and functions at the level of cell, tissue, organism - Interactions between macromolecules determine the integrity of biological systems and the structural-functional quality of organisms - Summary test nr.1: - Replication provides duplication and tran ...
Chapter 6 lecture notes
Chapter 6 lecture notes

... Many of the internal membranes in a eukaryotic cell are part of the endomembrane system, which includes the nuclear envelope, endoplasmic reticulum, Golgi apparatus, lysosomes, vesicles, vacuoles, and plasma membrane. The tasks of the endomembrane system include synthesis of proteins and their trans ...
Name Date ______ Period _____
Name Date ______ Period _____

... In 1839, German biologist Theodor Schwann found that some animal tissues closely resembled the circular tissues of plants. As he observed the tissues with better and better microscopes, he concluded that animals are composed of cells as well. Also during this time, Robert Brown discovered an object ...
Astronomy Review
Astronomy Review

... • What two organelles function in maintaining shape and stability in a plant cell? ...
Phosphoinositide regulation of clathrin
Phosphoinositide regulation of clathrin

... of intracellular membrane traffic and cell signalling. PI(4)P, the immediate substrate for PI(4,5)P2 synthesis, is enriched within Golgi membranes, at the TGN, and is generated within secretory vesicles (Figure 1). In mammals, three PIPKIγ isoenzymes exist (α, β and γ ), all of which have been shown ...
cell wall - Zanichelli online per la scuola
cell wall - Zanichelli online per la scuola

... Nucleus and nucleolus The nucleus contains the DNA with the genetic information of the organism. The DNA controls the synthesis of proteins and it replicates during cell division. The subunits of ribosomes are assembled in the nucleolus. The synthesis of proteins takes place in the cytoplasm, on ri ...
Plasma Membrane
Plasma Membrane

... channels) open or close depending on the presence or absence of a physical or chemical stimulus The chemical stimulus is usually different from the transported molecule Ex: when neurotransmitters bind to specific gated channels on the receiving neuron, these channels open This allows sodium ions ...
< 1 ... 156 157 158 159 160 161 162 163 164 ... 598 >

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.
  • studyres.com © 2025
  • DMCA
  • Privacy
  • Terms
  • Report