Exercise 1: Cell Transport Mechanisms and Permeability: Activity 3: Simulating Osmotic Pressure Lab Report Pre-lab Quiz Results You scored 100% by answering 4 out of 4 questions correctly. 1. Which of the following is true of osmosis? You correctly answered: c. It is a type of diffusion. 2. Which of the following occurs when a hypertonic solution is added to cells? You correctly answered: d. The cells shrink. 3. The variable that affects osmotic pressure is You correctly answered: a. the concentration
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The brain has a specialized vasculature that extends from the surface to deep within the brain tissue‚ reaching all regions in order to meet the brain’s high metabolic demands. Exposures to toxic compounds entering the blood have the potential to access this vasculature leaving the brain susceptible to possible neurotoxicity. Currently‚ there are over 200 known chemicals that have been correlated with neurotoxicity. A protective mechanism called the blood brain barrier (BBB) was first discovered
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1.A) Two main forms of cells exist: eukaryotic cells and prokaryotic cells. Prokaryotic cells are smaller and do not have membrane-bound nucleus or membrane- bound organelles‚ but do have: plasma membrane‚ cytosol and cytoplasm‚ and ribosomes. Prokaryotes contain much less DNA than eukaryotes and have circular chromosomes. Eukaryotic cells have information processing organelles‚ such as the nucleus which houses most of the cell’s DNA‚ and ribosomes which use information from DNA to produce proteins
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semi fluid substance inside the cell‚ containing the Nucleus and other organelles within the cell. Plasma membrane – is the outer lining that encloses a cell. Some other prime importance to our existence in the way of nature of cells and their characteristics include: Permeability – is a property of membrane that allows the transportation of molecules and ions to pass through the membrane. Mitochondria – is seen as a capsule shape organelle inside a cell‚ this is known as the ‘Power Houses’
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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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Oxidative phosphorylation requires all of the items listed below except a. ATP synthase in the correct position in the membrane. b. The flow of electrons from NADH to protein in the membrane. c. A matrix more positively charged than the inter-membrane space. d. A terminal electron acceptor which is oxygen in mitochondria. e. Enzyme complexes embedded in a membrane. 2. Which of the following statement about enzymes is FALSE? a. An enzyme can be used over and over
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Exercise 1: Cell Transport Mechanisms and Permeability: Activity 2: Simulated Facilitated Diffusion Lab Report Pre-lab Quiz Results You scored 50% by answering 2 out of 4 questions correctly. 1. Molecules need a carrier protein to help them move across a membrane because Your answer : a. they are not lipid soluble. Correct answer: d. they are lipid insoluble or they are too large. 2. Which of the following is true of facilitated diffusion? You correctly answered: c. Movement is passive and down
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The structures labeled d are synaptic knobs. When an action potential reaches the knobs‚ they release neurotransmitters that carry the signal across the synapse. These neurotransmitters usually work by binding to receptor proteins in the membrane of the receiving neuron. This binding opens gates that allow sodium ions to enter the cell. 3. Name two ways in which the structure of a neuron is well adapted to perform the functions of the nervous system. A neuron’s structure is well adapted
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the movement of osmosis through a selectively permeable membrane‚ in this case potato. Introduction: Osmosis is the movement of water through a semi permeable membrane‚ separating solutions of different concentrations. The water passes from a region of high concentration to a region of low concentration‚ until the two concentrations are equal in concentrations of water. Many cell membranes behave as semi permeable membranes‚ and osmosis is a vital mechanism in the transport of fluids
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called the __(7)__‚ is the outermost layer of the heart wall‚ called the __(9)__‚ is composed of __(10)__; it forms the bulk of the heart. Connective tissue fibers that ramify throughout this layer construct the so-called __ (11)__ of the heart. The membrane that lines the heart and also forms the valve flaps is the __(12)__. This layer is continuous with the __ (13)__ linings of the blood vessels that enter and leave the heart. The heart has __ (14)__ chambers. Relative to the roles of these chambers
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