题目内容
Living matter is made up of many different elements, but 96% of all living matter is comprised of just a few. Which element below is part of this 96%?
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1.4 Based upon the structure of the cell membrane, which description of molecules describes those that would most easily pass through a cell membrane?
1.4 The immune system is part of the body's specific defense system. When the body is exposed to a foreigh protein (antigen) that stimulates an immune response, cells known as macrophages engulf and digest the foreign protein. The macrophages then engage in what is known as antigen presentation, a process in which the macrophage displays the antigen on its cell membrane's surface. Which of the following statements below correctly describes the process of antigen presentation?
1.3 Individuals with a genetic disorder Tay-Sachs disease have a mutant HEXA gene. This gene codes for an enzyme (HEXA) that metabolizes a specific type of lipid called a ganglioside glycolipid. When HEXA is mutant, this glycolipid cannot be degraded and accumulates in the bloodstream, causing irreparable brain damage. Which of the following cellular organelles is most directly involved in the disease process?
1.3 Specialized cells in the pancreas known as beta cells produce the hormone insulin, a short-chain protein composed of 51 amino acids. The insulin produced is then secreted by the beta cells into the bloodstream upon consumption of a meal in order to regulate blood glucose levels. Which group of organelles is involved with this process?
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