• 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
Cells: Prokaryote vs Eukaryote
Cells: Prokaryote vs Eukaryote

... Decomposers: feed on dead things ...
Anatomy of the Eukaryotic Cell
Anatomy of the Eukaryotic Cell

... that each half of the membrane is composed of a phosphate group with 2 lipid chains attached to it. (See diagram on next page.) You can also find a diagram of a phophate group on page 44 of your textbook. • Within the lipid bilayer there are proteins. These proteins are often used to transport nutri ...
Chapter 8: Cell Reproduction
Chapter 8: Cell Reproduction

... Eukaryotes Chromosome ...
Biology 207
Biology 207

... Note: You need not learn an entire signal transduction pathway--whichever one you learn will be out of date in months! d. Transcription factors--Proteins that promote (or repress) the transcription of particular genes. ...
Difference Between Cytosol and Cytoplasm
Difference Between Cytosol and Cytoplasm

... Cytosol is the intra-cellular fluid that is present inside the cells. Once the process of eukaryotes starts, the fluid is separated by the cell membrane from the organelles (mitochondrial matrix) and the other contents that float about in the cytosol. Cytosol is the part of the cytoplasm that is not ...
Cell Membrane
Cell Membrane

... The cell membrane is a fluid, semi-permeable bilayer that separates the cell's contents from the environment. Cell membrane ...
BIOLOGY
BIOLOGY

... 14. Enzymes are classified as which type of organic compound? 15. Which group of organic compounds is used as a quick energy source, a structural component and some energy storage? 16. What would happen if an animal cell were placed in a fluid that contained less salt than the cell? Explain. ...
Cell Structure and Function
Cell Structure and Function

... • Outer membrane of cell that controls movement in and out of the cell • Double lipid layer ...
BIOLOGY 1: FIRST SEMESTER FINAL EXAM
BIOLOGY 1: FIRST SEMESTER FINAL EXAM

... is the name for this organelle? 42. How are chloroplasts similar to mitochondria? 43. How are plant and animal cells different? 44. What is the definition of diffusion? 45. What is the difference between a hypertonic and a hypotonic solution? ...
My Plant Cell Children`s Book
My Plant Cell Children`s Book

... Cytoplasm is the liquid-like substance that fills the cell Cytoplasm is found throughout the cell but not in the nucleus Cytoplasm is like fruit jello because all of the cell organelles float around in it ...
Chapter Review
Chapter Review

... Multiple Choice ...
Cells 2/05 OBJECTIVES The student should be able to: 1.Describe a
Cells 2/05 OBJECTIVES The student should be able to: 1.Describe a

... of the egg is an individual cell and it can certainly be studied without the microscope. During your work today, you will learn to distinguish each type of cell from other related types. Most cells share many organelles, but in each cell type there are major differences of form and function. In this ...
Animal Cell - TeacherWeb
Animal Cell - TeacherWeb

... Nickname: The shippers Function: packages, modifies, and transports materials to different location inside/outside of the cell Appearance: stack of pancakes ...
NAME DATE___________ CHAPTER 7 CELL STRUCTURE AND
NAME DATE___________ CHAPTER 7 CELL STRUCTURE AND

... Below is a diagram showing the addition of a dye (food coloring) to a beaker of water. 6. What process is this demonstration depicting? ...
The phases of Mitosis
The phases of Mitosis

... THE PHASES OF MITOSIS Claire Stevens ...
Cell Organelle Review Game
Cell Organelle Review Game

... After the definition is read, Students from both teams must identify the appropriate cell organelle that is being defined and place it in the appropriate cells (plant, animal or both) before the other team gets there to gain points. Note: It is your job as the teacher to set up the main objective of ...
Unit 3 (part 1) Study Guide Objectives: Can you….? List the
Unit 3 (part 1) Study Guide Objectives: Can you….? List the

... organelles - "little organs" that carry out cell functions ...
Chapter 3 Guided Reading
Chapter 3 Guided Reading

... What type of microscope did Leeuwenhoek design which was much more powerful than Hooke’s microscope? ...
How Small Can You Go - Thunderbird High School
How Small Can You Go - Thunderbird High School

... Objective: To become familiar with a variety of eukaryotic cells I. Eukaryotic Cells All organisms other than bacteria are composed of eukaryotic cells. Eukaryotic cells are significantly larger than the prokaryotic cells and they are structurally more complex. In addition to the cell membrane there ...
chapter 7 a tour of the cell
chapter 7 a tour of the cell

...  The stroma contains DNA, ribosomes, and enzymes.  The thylakoids are flattened sacs that play a critical role in converting light to chemical energy. In some regions, thylakoids are stacked like poker chips into grana.  The membranes of the chloroplast divide the chloroplast into three compartme ...
Regulation of Gene Expression
Regulation of Gene Expression

... The regulation of gene expression conserves energy and space. It would require a signicant amount of energy for an organism to express every gene at all times, so it is more energy ecient to turn on the genes only when they are required. In addition, only expressing a subset of genes in each cell ...
cell organelles PP
cell organelles PP

... Breaks down larger food molecules into smaller molecules  Digests old cell parts ...
Unit 1- Cells Test Review
Unit 1- Cells Test Review

... 3. cell wall, cell membrane Cell wall is found only in plants and is the outside layer which protects the cell and gives the plant cell its shape. The Cell membrane is found in both plants and animals. 4. organ, organelle An organ is a group of tissues that work together to do a specific job within ...
Unit 1- Cells Test Review
Unit 1- Cells Test Review

... 3. cell wall, cell membrane Cell wall is found only in plants and is the outside layer which protects the cell and gives the plant cell its shape. The Cell membrane is found in both plants and animals. 4. organ, organelle An organ is a group of tissues that work together to do a specific job within ...
Chapter Two Line Title Here and Chapter Title Here and Here
Chapter Two Line Title Here and Chapter Title Here and Here

... The Plasma Membrane: Membrane Transport 5. Relate plasma membrane structure to active and passive transport processes. 6. Compare and contrast simple diffusion, facilitated diffusion, and osmosis relative to substances transported, direction, and mechanism. 7. Differentiate between primary and secon ...
< 1 ... 308 309 310 311 312 313 314 315 316 ... 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