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The most favorable environmental conditions that prompted the growth of cities wereResponsesa dry climatea dry climatehigh mountainshigh mountainsaccess to fresh wateraccess to fresh waterriversriversseasonal climate changeseasonal climate change
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- Consider two unequal masses, M and m. Which of the following statements is false?A) The center of mass lies on the line joining the centers of each mass.B) The center of mass is closer to the larger mass.C) It is possible for the center of mass to lie within one of the objects.D) If a uniform rod of mass m were to join the two masses, this would not alter the positionof the center of mass of the system without the rod present.
- A. An oncogene is a dominantly expressed mutation which gives a cell a growth or survival advantage.An oncogene is a mutated form of a normal cellular gene (the proto-oncogene) which codes for a protein which is either controlled abnormally so that it is expressed in abnormally large amounts or has gained activity so that it is more active than the normal protein. In either case only one gene of a pair needs to become oncogenic for the activity to be expressed, so the mutation is dominant, and this is the best definition. Some oncogenes code for a protein which forms part of a signal transduction pathway. A 'gain of function' mutation in such a gene can make the pathway more active. Other oncogenes code for a protein which protects the cell against apoptosis. Increased production of this protein can prevent the cell entering apoptosis. However either of these choices provides only a partial definition of an oncogene. Cell cycle control proteins prevent cell division and are anti-oncogenic.
- Large pharmaceutical companies spend billions of dollars influencing physicians and patients to use more expensive brand name drugs.- True- False