• Study Resource
  • Explore Categories
    • 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 - Edquest Science
Cells - Edquest Science

... involved in cell processes. When water is lost (moves out of the cell) it leaves behind a high concentration of the dissolved substances – when water moves back into the cell, the substances become more diluted and can be used by the cell for it’s life functions. ...
Science 10
Science 10

... The Cell as an Open System 3. Plant cells have one large central vacuole that stores water; animal cells have several small vacuoles that store water, nutrients or wastes 4. Animal cells have centrioles, plant cells do not ...
Class 3
Class 3

... BODY; PULLS WATER TOWARD IT; TOO MUCH DEHYDRATED CELL = CRENATION (3% NaCl) ...
PDF
PDF

... During morphogenesis, the elongation of polarised tissues involves cells within epithelial sheets and tubes making and breaking intercellular contacts in an oriented manner. How cells remodel their junctional contacts is poorly understood but growing evidence suggests that localised endocytic traffi ...
Sharks are osmoregulators that maintain high internal salt
Sharks are osmoregulators that maintain high internal salt

... d) The Ca2+ needed for vesicle formation can only be found close to the post-synaptic membrane. The ion effecting a chemical response to an action potential is: a) Ca2+. b) Na+. c) K+. d) Cl-. Blood flows at the slowest rate in: a) The aorta. b) The inferior vena cava. c) The capillaires. d) The wh ...
PDF
PDF

... During morphogenesis, the elongation of polarised tissues involves cells within epithelial sheets and tubes making and breaking intercellular contacts in an oriented manner. How cells remodel their junctional contacts is poorly understood but growing evidence suggests that localised endocytic traffi ...
10.4 Cell Differentiation
10.4 Cell Differentiation

... 9. Which is not a new, potential benefit of stem cell research? A. growing new skin cells to repair a cut B. replacing heart cells damaged by heart attacks C. repairing breaks between nerve cells in spinal injuries D. preventing suffering and death caused by cellular damage 10. What is the main reas ...
Cell Organelle Quiz
Cell Organelle Quiz

... 7. Cell Theory says that: a. all living things are made of cells. b. cells are the basic unit of life. c. living cells come only from other living cells. d. ALL of the above ...
Laboratory 4: Cell Structure and Function
Laboratory 4: Cell Structure and Function

... while others are immovably fixed as part of tissues of multicellular organisms. All cells exchange materials with their immediate environment and therefore have a plasma membrane that controls which substances are exchanged by allowing some materials to pass through it while slowing or stopping othe ...
Summer Exam 2 Objectives
Summer Exam 2 Objectives

... (1) Explain how plant and animal cells change when placed into hypertonic or hypotonic solutions. iv) Compare and contrast the processes of facilitated diffusion and active transport. v) Distinguish between exocytosis, endocytosis, and receptor-mediated endocytosis. 2) Introduction to the Cell a) De ...
Cell Structure
Cell Structure

... • Contains the DNA in chromosomes • Bounded by a nuclear envelope (membrane) with pores • Usually the largest organelle ...
File
File

... compounds formed. The experiment showed that molecules needed for life could have arisen from simpler compounds. Under some conditions, large organic molecules form tiny bubbles called proteinoid microspheres. Structures similar to proteinoid microspheres might have become the first living cells. RN ...
Occurrence (Distribution of bacteria)
Occurrence (Distribution of bacteria)

... creep slowly on a supporting surface as a result of wave-like contractions ( contract and relax) of their bodies. Swimming bacteria move freely in a liquid medium due to the presence of flagella. Flagellated forms differ with respect to number and pattern of attachment of flagella. The following for ...
Cell Biology
Cell Biology

... Both have their own DNA and ribosomes that are similar to those found in prokaryotes. Both make many of their own proteins and both multiply in a fashion similar to prokaryotic cell division. Both are double membrane organelles - the inner membrane descended from the ancestral guest cell, and the ou ...
Cell Biology 2
Cell Biology 2

... Both have their own DNA and ribosomes that are similar to those found in prokaryotes. Both make many of their own proteins and both multiply in a fashion similar to prokaryotic cell division. Both are double membrane organelles - the inner membrane descended from the ancestral guest cell, and the ou ...
WHAT LIMITS CELL SIZE
WHAT LIMITS CELL SIZE

... DIFFUSION: Diffusion is a fast and efficient process over short distances, however becomes slow and inefficient as distance increases Ex: mitochondria at center of very large cell – can’t get necessary nutrients from diffusion ...
Intro to cells
Intro to cells

... stack of pancakes • packages proteins and carbohydrates into vesicles for "export" from the cell. Jello Model: ...
Part 4
Part 4

... Ex : mitochondria ancestors may have been aerobic bacteria that were able to use oxygen to release large amounts of energy from organic molecules by cellular respiration. The host cell may have injested these for food; if they remained alive, they continued to perform respiration within the cell. Ex ...
Exercise 8.1-1 Quick Questions to 8.1 Solar Cells - General Concerns
Exercise 8.1-1 Quick Questions to 8.1 Solar Cells - General Concerns

... Discuss the origin of the j terms. Compare (qualitatively) the magnitude of j1 and j2 . What kind of properties of Si influence the value of jPh? Why is "dirty" Si not good for solar cells? Hint: Follow the fate of a photon-generated carrier. Draw the j-U curve of an illuminated decent solar cell. D ...
3) Cellular Aging - Cal State LA
3) Cellular Aging - Cal State LA

... • Cytoplasmic organelles consisting of flattened, membranous sacs • Enzymes; add carbohydrates to proteins (glycoprotein) or add fatty acids or other groups to proteins • Eventually become membranous  pinch off from the sac  vesicle  move to surface  fuse w/plasma membrane  release their conten ...
Reproduction and Development
Reproduction and Development

... asexual and sexual reproduction. Appropriate responses may include, but are not limited to, the following: Similarities between asexual and sexual reproduction: • both produce new organisms • both transfer genetic material Differences between asexual and sexual reproduction: • no fusion of nuclei in ...
CELLS
CELLS

... oxygen, nitrogen, phosphorus, and sulphur. Although many nonliving structures also contain these elements, cells are different in their organization and maintenance of a boundary, their ability to regulate their own activity, and their controlled metabolism. All cells contain three basic features: 1 ...
Eukaryotic Cells
Eukaryotic Cells

... 14. Cell parts that break down sugar to make cell energy are called _____________________. 15. Plant cell parts that use the sun to make food are called ______________________. 16. Organelles that break down food particles and cell waste are called _______________________. 17. This genetic material ...
The Cell
The Cell

... See If You Can Answer These… ...
Viruses: intimate parasites
Viruses: intimate parasites

... – Have a complex, organized structure ...
< 1 ... 857 858 859 860 861 862 863 864 865 ... 1231 >

Amitosis

Amitosis (a- + mitosis) is absence of mitosis, the usual form of cell division in the cells of eukaryotes. There are several senses in which eukaryotic cells can be amitotic. One refers to capability for non-mitotic division and the other refers to lack of capability for division. In one sense of the word, which is now mostly obsolete, amitosis is cell division in eukaryotic cells that happens without the usual features of mitosis as seen on microscopy, namely, without nuclear envelope breakdown and without formation of mitotic spindle and condensed chromosomes as far as microscopy can detect. However, most examples of cell division formerly thought to belong to this supposedly ""non-mitotic"" class, such as the division of unicellular eukaryotes, are today recognized as belonging to a class of mitosis called closed mitosis. A spectrum of mitotic activity can be categorized as open, semi-closed, and closed mitosis, depending on the fate of the nuclear envelope. An exception is the division of ciliate macronucleus, which is not mitotic, and the reference to this process as amitosis may be the only legitimate use of the ""non-mitotic division"" sense of the term today. In animals and plants which normally have open mitosis, the microscopic picture described in the 19th century as amitosis most likely corresponded to apoptosis, a process of programmed cell death associated with fragmentation of the nucleus and cytoplasm. Relatedly, even in the late 19th century cytologists mentioned that in larger life forms, amitosis is a ""forerunner of degeneration"".Another sense of amitotic refers to cells of certain tissues that are usually no longer capable of mitosis once the organism has matured into adulthood. In humans this is true of various muscle and nerve tissue types; if the existing ones are damaged, they cannot be replaced with new ones of equal capability. For example, cardiac muscle destroyed by heart attack and nerves destroyed by piercing trauma usually cannot regenerate. In contrast, skin cells are capable of mitosis throughout adulthood; old skin cells that die and slough off are replaced with new ones. Human liver tissue also has a sort of dormant regenerative ability; it is usually not needed or expressed but can be elicited if needed.
  • studyres.com © 2026
  • DMCA
  • Privacy
  • Terms
  • Report