Glucose is the starting molecule for glycolysis.
        
             
        
        
        
Answer:
exothermic
Explanation:
This chemical reaction is an exothermic reaction because heat is liberated into the environment. 
In organic chemistry, the reaction is termed a combustion reaction. In such a reaction, a fuel combines with oxygen to produce carbon dioxide and water. 
It is an energy transformation from chemical energy to heat energy. 
- An exothermic reaction is one in which heat is liberated to the surrounding. 
- The surrounding becomes hotter at the end of the reaction. 
In the reaction depicted, heat is liberated. 
 
        
             
        
        
        
Answer:
See Explanation
Explanation:
1) Let us recall that;
Mass number = number of protons + number of neutrons
Where;
Number of protons = ?
Number of neutrons =20
Mass number =39
Number of protons = mass number - number of neutrons 
Mass of protons =39 - 20= 19 protons
2) Atomic number = 13
Number of neutrons =14
Then the mass number =13 +14 =27
The symbol of the element is 27X13
The number of protons= the number of electrons =13
The atomic number is the same as the proton number =13