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7.012 SECTION PROBLEM
7.012 SECTION PROBLEM

... Embryos with the C cells--> in the animal you detect the virus in all tissues tested kidneys, ovary/testes, and the adrenal glands. Embryos with the D cells --> in the animal you detect the virus only in the testes. a) Based on this experiment, which of the four cell types have the characteristics o ...
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... We tend to only think of animals as living. However, there is a great diversity of organisms that we consider “living” (including bacteria, fungi, plants, AND animals). What is it that makes something alive? Why are you alive? Use pages 11-13 in your textbook to identify the six characteristics of A ...
Jack Szostak Lecture Part 1: The Origins of Life Teaching
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... carry information led to the hypothesis that life emerged as a single cell carrying RNA polymer(s). As evolution continued, specialized storage molecules, transport systems, and compartments of modern cells would emerge. ...
Potato Osmosis - California State University, Bakersfield
Potato Osmosis - California State University, Bakersfield

... Osmosis is the movement of fluids (usually water) from a lower concentration of solutes to a higher concentration of solutes through a semi-permeable membrane to equalize the concentration on both sides. Osmosis in an animal cell is somewhat different to osmosis in a plant cell; this is due to the c ...
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incredible_cell_project

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... 1. Study the statement above. Which cell organelle manages the process by which proteins are sorted and packaged to be sent where they are needed? a. ribosomes b. lysosomes c. Golgi bodies d. vacuoles 2. Study the statement above. Which cell organelle is responsible for storing enzymes and other mat ...
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... Viewing cells under a light microscope allows a scientist to some, but not all of the different cell parts. Larger structures, such as the nucleus, cell wall, and cell membrane can be seen when viewing a properly stained eukaryotic cell. Most prokaryotic cells are too small to view any cell parts wi ...
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Exploring a Plant Cell:

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... You point out that they have nucleoids without a nuclear membrane rather than nuclei, they lack “cytoplasmic” organelles and they are said to have protoplasm rather than cytoplasm. Although we are not proposing a definition as yet for organism, we take it for granted that Prokaryotes are organisms a ...
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... differs from one type of microbes to another for example: Over a third of vegetative bacteria may survive 1 year while most parasites are killed within a few days of freezing at -21 oC . - freeze-drying (lyophilization): used in preserving plasma products and many of the powdery materials which are ...
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BIOL 201: Cell Biology and Metabolism
BIOL 201: Cell Biology and Metabolism

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Solute transport - Lectures For UG-5
Solute transport - Lectures For UG-5

... • Only potassium can diffuse either inward or outward – All others must be expelled by active transport. Release of K+ into xylem Closing of stomata ...
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5.5 Transport

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Endomembrane system

The endomembrane system is composed of the different membranes that are suspended in the cytoplasm within a eukaryotic cell. These membranes divide the cell into functional and structural compartments, or organelles. In eukaryotes the organelles of the endomembrane system include: the nuclear membrane, the endoplasmic reticulum, the Golgi apparatus, lysosomes, vesicles, endosomes and the cell membrane. The system is defined more accurately as the set of membranes that form a single functional and developmental unit, either being connected directly, or exchanging material through vesicle transport. Importantly, the endomembrane system does not include the membranes of mitochondria or chloroplasts.The nuclear membrane contains two lipid bilayers that encompass the contents of the nucleus. The endoplasmic reticulum (ER) is a synthesis and transport organelle that branches into the cytoplasm in plant and animal cells. The Golgi apparatus is a series of multiple compartments where molecules are packaged for delivery to other cell components or for secretion from the cell. Vacuoles, which are found in both plant and animal cells (though much bigger in plant cells), are responsible for maintaining the shape and structure of the cell as well as storing waste products. A vesicle is a relatively small, membrane-enclosed sac that stores or transports substances. The cell membrane, is a protective barrier that regulates what enters and leaves the cell. There is also an organelle known as the Spitzenkörper that is only found in fungi, and is connected with hyphal tip growth.In prokaryotes endomembranes are rare, although in many photosynthetic bacteria the plasma membrane is highly folded and most of the cell cytoplasm is filled with layers of light-gathering membrane. These light-gathering membranes may even form enclosed structures called chlorosomes in green sulfur bacteria.The organelles of the endomembrane system are related through direct contact or by the transfer of membrane segments as vesicles. Despite these relationships, the various membranes are not identical in structure and function. The thickness, molecular composition, and metabolic behavior of a membrane are not fixed, they may be modified several times during the membrane's life. One unifying characteristic the membranes share is a lipid bilayer, with proteins attached to either side or traversing them.
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