The genetic code is said to be "degenerate" becausea. a single trna may couple a single mrna codon to multiple amino acids. b. a single codon in an mrna can couple to the anticodons of many different types of trnas. c. a single trna specific for a particular amino acid may respond to multiple codons in an mrna d. more than one type of trna can be charged with a particular amino acid.

The correct answer is option C. "A single tRNA specific for a particular amino acid may respond to multiple codons in an mRNA".

Explanation:

Genetic code is said to be "degenerate" because there are more codons than amino acids, which is possible because a single tRNA specific for a particular amino acid may respond to multiple codons in an mRNA. tRNA recognize the codons of the mRNA by a specific nucleotide sequence called anticodon, however the nucleotide sequence of the anticodon can recognize more than one codon sequence. This phenomenon takes place at the third position of the codon and is known as "wobble".

The answer is a. bacteria.

Bacteria are single-celled organisms. Some species are pathogenic and are able to cause diseases such as tetanus, cholera, tuberculosis, etc. But, some of them can be "edible". This term should be used with caution. They are edible in terms that they are used in technology and industry. Some bacteria species are used in the production of cheese, yogurt, wine, etc.

The other three groups - fungi, protozoa, and viruses are also pathogenic. But, protozoa are not edible. Viruses are not edible and also not cellular. Fungi are edible, but the edible species are multicellular, not single-cellular.