Answer:
The possible letters are A, C, G, and T, representing the four nucleotide bases of a DNA strand — adenine, cytosine, guanine, thymine — covalently linked to a phosphodiester backbone.
Explanation:
 
        
                    
             
        
        
        
Cardiac Muscle, reason its called Cardiac attack when you have that sort of " Heart Attack "
        
                    
             
        
        
        
This is based on borderline personality disorder which is low levels of activity in anterior cingulate cortex is associated with hoarding behaviors, suicidal behavior that is 7.5% suicide over 20 years old, self-injury 2/3 ; 3/4 stabilize in 10 to 15 years, co-morbid PTSD or mood disorder, at risk for substance abuse and eating disorders, schizotypal personality disorder, might be related to dissociation identity disorder, genes account for 60% variance in developing BPD, lower serotonin function, increased activation of amygdala and disturbed connectivity b/w prefrontal cortex and the amygdala. 
        
                    
             
        
        
        
Answer:
Diamond-
Physical identification characters:
Color-  White or Colorless
Lusture - admantine
Streak - Colorkess
Habit - Hour glass structure
Hardness - 10
Cleavage- octaheadral
Composition- pure carbon
Specific gravity-3.5
Dolomite (CaMg(CO3)2
Color - Colorless or white
Hardness is between 3-4
Reacts with any acid
Gneiss
Light and dark strip or banding present alternatively
biotite , pyroxene have Mafic mineral shows dark banding
Quartz, Feldspar have  Felsic mineral for light banding
High grade metmorphic rock which is formed due to regional metamorphism of lower grade rock
Chalk(CaCO3)
Color-White
Very fragile
Hardness-1
With acid gives effervescence.
 
        
             
        
        
        
The name of the enzyme present on the mitochondrial membrane, that allows hydrogen ions to flow through to provide the energy to phosphorylate ADP to form ATP is ATP Synthase.