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Homeostasis
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Living Environment Regents June 2008 Question 15 |
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Thursday, 23 April 2009 06:02 |
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Photosynthesis: Is a process that converts carbon dioxide into organic compounds, especially sugars, using the energy from sunlight. They get electrons from a variety of organic and inorganic molecules
Cellular Respiration: It is a process that takes place in organisms cells to convert biochemical energy from nutrients into adenosine triphosphate (ATP), and then release waste products. The reactions involved in respiration are catabolic reactions that involve the oxidation of one molecule and the reduction of another. Organisms respire using inorganic molecules as electron donors and acceptors.
Correct Answer: Option 3
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Living Environment Regents June 2008 Question 19 |
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Thursday, 23 April 2009 06:22 |
ATP: Adenosine triphosphate (ATP) is a multifunctional nucleotide. It plays an imporatn role in intracellular energy transfer.
Glucose: Glucose is an important carbohydrate that is used as a source of energy by living cells
DNA: Deoxyribonucleic acid (DNA) is a nucleic acid that contains the genetic instructions used in the development and functioning of all living organisms.
Starch: It is a polysaccharide carbohydrate consisting of a large number of glucose units joined together by glycosidic bonds. Starch is produced by all green plants as an energy store and is a major food source for humans
Correct Answer: Option
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Living Environment Regents June 2008 Question 20 |
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Thursday, 23 April 2009 06:24 |
Transplant rejection occurs when a transplanted organ or tissue is not accepted by the body of the transplant recipient. This is explained by the concept that the immune system of the recipient attacks the transplanted organ or tissue. This is expected to happen, because the immune system's purpose is to distinguish foreign material within the body and attempt to destroy it, just as it attempts to destroy infecting organisms such as bacteria and viruses. After transplant, special medications need to be taken to prevent your body's immune system from attacking the new organ.
Correct Answer: Option 2
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Living Environment Regents June 2008 Question 23 |
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Thursday, 23 April 2009 06:35 |
Cell A is engulfing the disease causing organism (Phagocytosis or cell eating)
Phagocytosis is a form of endocytosis. In the process of phagocytosis the cell changes shape by sending out projections which are called pseudpodia (false feet). The phagocytic cell such as a macrophage may be attracted to a particle like a bacteria or virus by chemical attractant. This process is called chemotaxis (movement toward a source of chemical attractant). The phagocytic cell sends out membrane projections that make contact with some particle.Some sort of receptor ligand interaction occurs between the phagocytic cell surface and the particle that will be ingested. The pseudopodia then surround the particle and when the plasma membrane of the projection meet membrane fusion occurs. This results in the formation of an intracellular vesicle.
Correct Answer: Option 3
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Last Updated on Monday, 30 November 2009 15:56 |
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Living Environment Regents June 2008 Question 55 |
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Thursday, 23 April 2009 08:24 |
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Correct Answer: When a virus infects humans, the relationship that exists between virus and humans is that of parasite and host.
The virus uses the human body cells to dwell and grow; and eventually infect the other cells.
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Living Environment Regents June 2008 Question 56 |
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Thursday, 23 April 2009 08:26 |
Correct Answer: In the human body the source of insulin is the pancreas.
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Living Environment Regents June 2008 Question 57 |
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Thursday, 23 April 2009 09:42 |
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Correct Answer: The blood sugar level is the other indicator of decrease in the secretion of insulin.
When the blood sugar level increases beyond a standard count, it indicates that the insulin secretion has reduced.
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Living Environment Regents June 2008 Question 59 |
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Thursday, 23 April 2009 09:48 |
Correct Answer: The human body will produce anti bodies to destroy the pathogens
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Living Environment Regents June 2008 Question 64 |
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Thursday, 23 April 2009 09:59 |
Correct Answer: Guard cells surround stomata in leaves and control the size of the hole. By reducing the size of the hole, less water vapor is able to escape and vice-versa. Varying the size of the stomata over time allows the plant to remain at a relatively constant hydration level.
One Function regulated by guard cells in leaves – Exchange of gases
Guard cells change the size of the leaf opening to control the exchange of water vapors
One possible evolutionary advantage of the position of the guard cells on the leaves of land plants – prevents excess evaporation of water on sunny days
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Living Environment Regents June 2008 Question 70 |
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Thursday, 23 April 2009 10:28 |
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If you are going to be exercising for more than a couple of minutes, your body needs to get oxygen to the muscles or the muscles will stop working. Just how much oxygen your muscles will use depends on two processes: getting blood to the muscles and extracting oxygen from the blood into the muscle tissue. Your working muscles can take oxygen out of the blood three times as well as your resting muscles.
Correct Answer: Option 1
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