Describe the cellular and molecular function of the ras gene family and the consequences of mutations in ras
What will be an ideal response?
The ras gene family encodes a protein that is involved with signal transduction in the cell membrane. Point mutations may cause changes in function that promote abnormal signaling, thus stimulating uncontrolled cell growth.
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Studies indicate that in utero nicotine exposure can cause breathing abnormalities in neonatal
mammals. These abnormalities can include
a. elevated breathing rate while awake. b. increased frequency of apneas during sleep. c. delayed arousal from sleep in response to hypoxia. d. elevated breathing rate while awake and increased frequency of apneas during sleep. e. increased frequency of apneas during sleep and delayed arousal from sleep in response to hypoxia.
The main phenomenon that increases the efficiency of gas exchange in fish gills is the
A. back-and-forth movement of water that maximizes oxygen uptake. B. high degree of oxygen saturation of water. C. very high blood pressure found in the circulatory system of fishes. D. co-current exchange mechanism. E. countercurrent exchange mechanism.
Which animals use positive pressure breathing to ventilate their lungs?
a. reptiles b. birds c. dogs d. frogs
Plasmodial slime molds
A) are photoautotrophic. B) are marine decomposers. C) contain many nuclei in one mass of cytoplasm. D) are primitive fungi.