Answer:
miR-223 inhibits the expression of the fibroblast growth factor (bFGF) gene, and thereby ESCs cells maintain their undifferentiated state
.
Explanation:
Non-coding RNA (ncRNAs) are molecules that regulate gene expression, thereby playing important biological functions in cell differentiation, cell cycle, apoptosis, etc. MicroRNAs (miRNAs) are a type of ncRNAs capable of controlling gene expression patterns by regulating mRNA stability and by suppressing their translation into proteins. It has been shown that miRNAs function by imperfectly base-pairing with the 3′ UTR of target mRNAs (Pillai et al. 2005).
Citation:
R. S. Pillai, S. N. Bhattacharyya, C. G. Artus,   T.  Zoller, et al. (2005). Inhibition of translational initiation by Let-7 MicroRNA in human cells. Science, 309(5740), 1573-1576.
 
        
             
        
        
        
Nervous system responds to the environment
        
             
        
        
        
15 degrees Celsius is colder than 20 degrees Celsius. It gets colder as the temperature decreases.
 
        
                    
             
        
        
        
Answer:
Option C
Explanation:
As we know that 
Relative humidity (RH) is defined as the ratio of amount of water vapor present in a given sample of air to the maximum amount of water that can be  absorbed by the same sample of air to attain saturation  at a particular temperature
.
Thus, 

Where X represents the current amount of water vapor present in a given sample of air 
and Y represents the maximum amount of water that can be  absorbed by the same sample of air to attain saturation  at a particular temperature
Substituting the given values in above equation we get -

Hence, option C is the correct answer