the largest and most prominent organelle in the cell. It is usually spherical and about 10um in diameter. It contains the DNA and chromosomes and carries information that allows the cell to divide and carry out its cellular processes. Almost all eukaryote cells have a nucleus. The nucleolus is located in the nucleus it is 1-2 um. Its function is to manufacture ribosomes. The ribosomes are found either free in the cytoplasm or attached to the rough endoplasmic reticulum R.E.R‚ They are 20nm in size
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developed more than three billion years ago (as the Earth is believed to be about 4.5 billion years old).It explains how species are formed. 3‚500‚000‚000 years ago-First bacteria (prokaryotes) 2‚000‚000‚000 years ago-First cells with organelles (eukaryotes) 1‚000‚000‚000 years ago-First multicellular organisms: algae‚ seaweeds‚ sponges‚ jellyfish worms 500‚000‚000 years ago-First fish 450‚000‚000 years ago-First land plants and fungi 390‚000‚000 years ago-First amphibians‚ insects and reptiles
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The difference between plant and animal comes down to cell structure. Animal cells do not have cell walls and have different structures than plant cells. Plant cells only are in rectangular shapes but animal cells are either circular‚ irregular or defined shapes depending on the type of cell. Plants have 3 basic organs; roots‚ stems‚ and leaves. Plants lack a brain and all the organs that animals have to carry out metabolic functions as animals take their carbon from organic substances and plants
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The nucleus is the most obvious organelle in a eukaryotic cell. Virtually all eukaryote cells have a nucleus (red blood cells lose theirs and so are enucleate for most of their life-span of 180 days). It is surrounded by the nuclear envelope‚ a double membrane with contains a large number of pores. Molecules enter and leave the nucleus by these pores. The two lipid bilayers of the double membrane are separated by a gap of 20 to 40 nm‚ called the perinuclear space. The nucleus contains the cell’s
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Unicellular organism From Wikipedia‚ the free encyclopedia Jump to: navigation‚ search "Single-celled" redirects here. For prison cell assignment‚ see Single-celling. Valonia ventricosa is among the largest unicellular species. A unicellular organism‚ also known as a single-celled organism‚ is an organism that consists of only one cell‚ unlike a multicellular organism that consists of multiple cells. Historically the simple single celled organisms have sometimes been referred to as monads
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LIFE ON EARTH REVISION Analysis of the oldest sedimentary rocks provides evidence for the origin of life. - Identify the relationship between the conditions on early Earth and the origin of organic molecules. - Formation of the organic molecule was the first event in the evolution of life. - The molecules provided a building block for cell formation and the food for the earliest life. - Present day life’s atmosphere contains: - Oxygen - Water - Carbon
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Protozoans (from Greek πρῶτον proton "first" and ζῷα zoa "animals"; singular protozoon) are microorganisms classified as unicellular eukaryotes.[1] While there is no exact definition of the term "protozoan"‚ most scientists use the word to refer to a unicellular heterotrophic protist‚ such as an amoeba or a cilipoopate. The term algae is used for microorganisms that photosynthesize. However‚ the distinction between protozoa and algae is often vague. For example‚ the alga Dinobryon has chloroplasts
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CDC1 Study Questions LIVING ORGANISMS CELLULAR CHEMISTRY CELL BIOLOGY GENETICS PLANT BIOLOGY INVERTEBRATES AND VERTEBRATES ECOLOGY LIVING ORGANISMS CLASSIFICATION Compare and contrast living and nonliving things. What is biology? The study of living things (science of life) Describe characteristics found in all living organisms. * Living things are made of cells. * Living things obtain and use energy. * Living things grow and develop. * Living things reproduce
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1. _______________________________________________. (Schleiden and Schwann) 2. _________________________________________________________________. 3. __________________________________________________________.(Virchow) PROKARYOTE VS. EUKARYOTE CELLS Cell Structures I. CELL _____________ (The __________ Bilayer) A. Function: ______________________________________________ 1. _____________ _________ – lets some things in & keeps others out B. Structure – Composed
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energy-requiring activities of the cell. Chloroplast → (in green plant cells) a plastid that contains chlorophyll and in which photosynthesis takes place. Chromatin → the material of which the chromosomes of organisms other than bacteria (i.e.‚ eukaryotes) are composed. It consists of protein‚ RNA‚ and DNA. Chromosome → a threadlike structure of nucleic acids and protein found in the nucleus of most living cells‚ carrying genetic information in the form of genes. Cristae → The infoldings or
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