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There are many different types of glycoproteins because of the vast array of sugars that may combine with the proteins that compose them. Sometimes unwanted substances pass through the membrane and may cause trouble within the cell.Ī glycoprotein is a molecule used as an identification or address for proteins seeking a particular site for bonding. Unfortunately the system is not always fool-proof. In so doing, an intact and healthy membrane is selectively permeable because it allows substances needed for cell prosperity to enter and attempts to prohibit the penetration of unwanted and unfriendly substances. The cell membrane also separates life from the nonlife on its exterior. The internal membranes compartmentalize reactions to prevent interference. Because of the incredible number and often conflicting biochemical reactions occurring in a cell at any one time, the cell must retain order via structural organization or risk chemical chaos. Membranes have many different functions within a typical cell, such as keeping unwanted viruses out, but probably the most valuable is the partitioning of the cell into functional and segregated compartments. Cell Cycle: Interphase, Mitosis, Cytokinesis.Fluid Mosaic Model of Membrane Structure and Function.An outer covering membrane is absent over Answer All types of plastids possess essentially the same structure because they Answer Active and passive transports across cell membrane differ in Answer Acetabularia used in Hammerling's nucleocytoplasmic experiments is Answer In this regard, which of the following statements is incorrect? Answer In recent years, this model has been modified in several respects. According to widely accepted 'fluid mosaic model' cell membranes are semi-fluid, where lipids and integral proteins can diffuse randomly. He should illuminate the object by which one of the following colours of light so as to get the best possible resolution? Answer A student wishes to study the cell structure under a light microscope having 10X eyepiece and 45X objective. A major site for synthesis of lipids is Answer Flagella of prokaryotic and eukaryotic cells differ in Answer Electron microscope has a high resolution power. Which of the following are not membrane - bound? Answer Which one of the following is not an inclusion body found in prokaryotes? Answer Water soluble pigments found in plant cell vacuoles are - Answer A cell organelle containing hydrolytic enzymes is - Answer The current and potential difference between the points P and Q are Answer Two batteries of emf 4 V and 8 V with internal resistance $1\, \Omega$ and $2\, \Omega$ are connected in a circuit with resistance of $9\, \Omega$ as shown in figure. The velocity of the car midway between P and Q is Answer It passes through two points P and Q separated by a distance with velocity 30 km/ h and 40 km/h respectively. A car is moving along a straight road with a uniform acceleration. The coefficient of friction between the body and the inclined plane is Answer Starting from rest, a body slides down a $45^\circ$ inclined plane in twice the time it takes to slide down the same distance in the absence of friction. The angle between the overlapping of one s-orbital and one p-orbital is Answer If the coil rotates at 200 rpm the amplitude of the alternating current induced in the coil is Answer In a region of magnetic induction B =$10^2$ tesla, a circular coil of radius 30 cm and resistance $\pi^2$ ohm is rotated about an axis which is perpendicular to the direction of B and which forms a diameter of the coil.
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