If the copy number of a proto-oncogene is increased by gene duplication then the proto-oncogene has undergone
A. a missense mutation.
B. a nonsense mutation.
C. a chromosomal translocation.
D. gene amplification.
E. retroviral insertion.
Answer: D
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Gray matter in the central nervous system
consists of all of the following except
a. cell bodies. b. dendrites. c. neuroglia. d. myelin sheaths. e. more than one of these
Arrange the following entries in the order in which air contacts them as air is drawn into the body. a. trachea b. bronchiole c. pharynx d. alveoli e. larynx
A) e, c, b, a, d B) c, a, e, d, b C) b, d, a, c, e D) c, a, e, b, d E) c, e, a, b, d
A cell contains a higher concentration of a substance than its surrounding environment. The cell membrane is highly permeable to this substance. What will happen as a result of diffusion?
A) The cell membrane will keep the substance inside the cell. B) The cell membrane will allow the substance to move to the cell's environment. C) The cell membrane will use the process of active transport to take in more of the substance. D) The cell membrane will allow more of the substance to enter the cell.
According to Mendel's model, because of the ________ of chromosomes during meiosis, all possible combinations of gametes will be formed in equal frequency
A) law of segregation B) law of unit factors C) the product rule D) independent assortment E) chromosomal theory of inheritance