Answer: a naturally occurring depsipeptide used in the transport of potassium 
 
        
             
        
        
        
Answer: The options are not included.
But the sites are;
Interaction with ribosomes.
Interaction with aminoacyl tRNA 
synthase.
Attachment of the specific Amino acid.
Interaction with codon.
Explanation:
Transfer RNA is a type of RNA that help to translate messenger RNA sequence into protein. Each tRNA have two major areas; the anticodon and region for attaching specific Amino acids.
tRNAs function at specific sites in the ribosomes during mRNA deciding.
The four specific recognition sites of trna that must be inherent in it's tertiary structures in order for it to carry out it's role are;.
Interaction with ribosomes.
Interaction with aminoacyl tRNA synthase.
Attachment of specific Amino acid.
Interaction with codon.
 
        
             
        
        
        
Answer: All the above options are correct about the characteristics of Lumbriculus variegatus.
Explanation:
Lumbriculus variegatus also called the black worm belongs to the phylum Annelida and is used by biologists to illustrate:
-blood vessel pulsations, 
-swimming reflex,
 -peristaltic crawling behavior, 
-giant nerve fiber action potentials. 
These studies where carried out on them due to the characteristics they possess. These includes:
-its blood circulates in a closed circulatory system
-Freshwater worm found throughout North America and Europe
-Prefers the shallow habitats found at the edges of ponds, lakes, or marshes
-Feeds on decaying vegetation and microorganisms.
 
        
             
        
        
        
The sequence of B) nucleotides in a DNA molecule determines the protein that will be produced.