<span>tRNA carries a single amino acid to the ribosome. 
It fits the codon on the mRNA in the ribosome with it's anti-codon. 
The ribosome has peptidyl-transferase activity which catalyses the peptide bond between 2 amino acids on 2 tRNAs in the ribosome. 
One tRNA is released and then picks up another amino acid depending on its anti-codon.
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The process of making multiple copies of a gene by inserting it into a host genome and culturing the host is an example of gene cloning.
        
             
        
        
        
Answer:
All matter goes back into carbon dioxide, water, and minerals
Explanation:
Matter cannot be created or destroyed. There is a constant cycle of matter that repeats itself. 
 
        
             
        
        
        
Answer:
Thymine= 60 ng
Guanine= 20 ng
The complementary base pairing occurs between adenine and thymine and guanine and cytosine bases. 
Explanation:
According to the Chargaff rule, a double-helical DNA molecule has an equal number or equal amount of adenine and thymine bases since adenine always pairs with thymine. Similarly, the amount of guanine base is equal to that of the cytosine base. 
Chargaff rule is based on the complementary base pairing between purine and pyrimidine bases. According to the given information, the amount of adenine is 60 ng. Therefore, the cell would have 60 ng thymine. Similarly, the amount of the cytosine base in the cell is 20 ng which means that the cell would have 20 ng of guanine base. 
 
        
             
        
        
        
Answer:
The change of the wick to carbon from the burning is a chemical change