Answer: If a mutation occurred in Silencer of Death Domain (SODD) that prohibited its interaction with the DD of TNF receptor, the TNF receptor would evoke its response by binding to a transmembrane receptor, TNFR1. 
Explanation: Binding to TNFR1 inhibits the recruitment of cytoplasmic signaling proteins to TNFR1 to prevent recruitment of a number of protein (TRADD) or prevent spontaneous aggregation of the cytoplasmic death domains of TNFR1 molecules.
SODD mechanism is useful in preventing unwarranted TNFR1 activation in the process of apoptosis. 
 
        
             
        
        
        
Answer:
Explanation:
A keystone species is the one which plays an important role in maintaining the structure of the ecosystem. On the keystone species many other species of the ecosystem are dependent upon.  
The potential effects associated with the keystone species includes the following:
1. No other species will be capable of filling the same ecological niche. Hence, the dependent organisms will suffer and the ecosystem will change drastically. 
2. The ecosystem will be populated by the invasive species which will affects the population of native species. 
 
        
             
        
        
        
Answer: b
Explanation: Mitosis produces 2 cells where has meiosis produces 4 and 2 is half of 4 
(plus I just took a test with this question) 
 
        
             
        
        
        
The gradual movement of the continents across the Earth’s surface throughout geological time.