mosaic model? What is the function of each component of the model? What determines the flexibility of the cell membrane? 14. What are the types of transport across the cell membrane? Which uses proteins? Which needs energy? 15. For end product feedback‚ the product stops enzyme activity. Explain the two ways enzymes are inhibited by product. 16. What is the resting membrane potential range of cells 17. Describe the model that describes how an enzyme fits a substrate. Which is the
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“Did you know that the network of capillaries in the human body is about 50‚000 to 60‚000 miles long?” The circulatory system is formed with two major organs‚ the heart and the blood vessels‚ which includes arteries‚ veins‚ and capillaries. The capillaries are the thinnest type of blood vessel in the body but are one of the most important in the circulatory system. There are three major different types of capillaries: continuous‚ fenestrated‚ and discontinuous or sinusoid. The reason there are three
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to carry out their function‚ and this is known as a cells ultrastrucure. All cells have a cell surface membrane; these are made up of phospholipids and make up a bilayer. A phospholipid has a hydrophilic head and a hydrophobic tail which is made up of 2 fatty acid chains; these are arranged is two layers with the tails facing inwards. Lipids soluble material can move through the plasma membrane but water soluble substance are unable to pass and therefore protein ion channels are required to monitor
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the sentence or statement is true or false. ____ 1. Eukaryotic cells are characterized by a lack of a distinct nucleus‚ whereas prokaryotic cells have intracellular compartments bordered by membranes and a well-defined nucleus. ____ 2. Lipids and proteins are the major components of the plasma membrane. ____ 3. Lysosomes remain fully active by maintaining an acid pH created by pumping hydrogen ions into their interiors. ____ 4. The chief function of ribosomes is to provide sites for lipid
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20 points Approximate chapter breakdown: 5% Lecture 1 – Introduction to Biology 5% Lecture 2 – The Scientific Method 20% Lecture 3 – The Chemistry of Life 25% Lecture 4 – Biological Molecules 25% Lecture 5 – The Cell 20% Lecture 6 – Cell Membranes Example Question 1. White blood cells are responsible for engulfing and digesting foreign objects such as bacteria and viruses. What organelle do you expect them to have a relatively large amount of? A) Lysosome B) Ribosome C) ER D) Golgi apparatus
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water molecules across a partially permeable membrane. 1. RESEARCH QUESTION How does 15% NaCl solution affect the appearance of onion cells? 2. HYPOTHESIS If onion cells are submerged in solutions of NaCl of different concentrations‚ then cells will lose water and the plasma membrane will shrink. This is because the process of osmosis will take place. Because of a difference between solute concentrations on either side of a partially permeable membrane‚ the movement of water molecules will occur
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enzymes‚ membrane carriers‚ ion channels and receptors. An article by Riding (2004)‚ was concerned with the receptor and describes the dynamics of drug–receptor interaction‚ agonists‚ antagonists‚ partial agonists and inverse agonists‚ efficacy and potency. Proteins that respond to steroid hormones are cytoplasmic receptor proteins. Ligand activated receptors may enter the cell nucleus where they modulate gene expressions. Many receptors for hormones and neurotransmission are trans-membrane proteins
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surface area of a beetroot (Beta Vulgaris) piece? Background The membrane consists of a phospholipid bilayer which is semi permeable. Osmosis is the passive movement of water molecules from an area of high water potential to an area of low water potential across a semi-permeable membrane. It is easy for water molecules to pass through this membrane however solutes that are big in size may find it hard to as the semi-permeable membrane is selective to the smaller particles. This may cause a change in
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Determining the Rate of Osmosis with Water and Sucrose 10/3/2012 Determining the Rate of Osmosis with Water and Sucrose Author: Results: Bag 1 had a rate of osmosis equal to 0.01 grams per minute. Bag 2 had a rate of osmosis equal to 0.0543 grams per minute. Bag 3 had a rate of osmosis equal to 0.0471 grams per minute. Bag 4 had a rate of osmosis equal to 0.0886 grams per minute. Bag 5 had a rate of osmosis equal to -0.0914 grams per minute (Figure A). Figure A: Shifting of mass
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vesicles composed of membranes from the ER‚ so it can inspect them for flaws and discard any extra materials added during their manufacture‚ wraps them up and then targets them for packaging. The Golgi complex is especially active in processing proteins for secretion. The Golgi releases a special enzyme called lysosomes‚ which clean off any extra amino acids‚ and once the package is ready‚ it is pinched off the Golgi and released into the cytoplasm. Once the Golgi apparatus membrane buds off and forms
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