<span>Amino acids are
weak acids that have at least 2 pka values. They have two titratable protons
that composed of alpha carboxyl (-COOH) and alpha amino (-NH3+), but some amino
acids have a third titratable protons with ionizable groups in the R side chain.
 In addition, the structure of amino
acids in peptides and proteins are determined by the charges of the titratable
group and by the R group. </span>
 
        
             
        
        
        
Answer:
all matter has mass
Explanation:
to be considered matter it must have mass and take up space
 
        
                    
             
        
        
        
Answer:
This is by co enzymes NADH and FADH2(adenine dinucleotide hydrogen and falvin adeninedinucleotide hydrogen. They are the co-enzymes that convey (electrons in )hydrogen atoms from the Kreb's cycle to the matrix of the  mitochondria.They are not enzymes,but rather, enhances the work of enzymes.
These co enzymes are oxidized by the loss of hydrogen atoms.The hydrogen spits into electrons and protons in the matrix.The protons is pumped into the intramembranes by the proton motive force produced from the  electron transport chains,and returned to the  matrix, to generate electrochemical gradient needed for  energy to be used by ATPase synthase for ATPs production
Explanation:
 
        
             
        
        
        
<span>By their nature, they can be either "good" (beneficial) or "bad" (harmful) for the health of plants, humans, and other animals that come into contact with them. A virus is acellular (has no cell structure) and requires a living host to survive; it causes illness in its host, which causes an immune response.Bacteria are alive, while ...</span><span>
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