I would go with D, speaker. A poem is written by an author, but the author isn't always the speaker.
The answer is d. Food chain
The identify of the four DNA nucleotides is based on b) covalent bonds.
Answer:
There is more than one codon that can specify most amino acids, therefore you never know which one was used for a particular protein, unless you can look at the DNA or RNA sequence.
Answer:
RNA is Ribonucleic acid
mRNA
rRNA
tRNA,
Explanation:
mRNA, or messenger RNA, that serve as temporary copies of the information found in DNA; rRNA, or ribosomal RNA, that serve as structural components of protein-making structures known as ribosomes; and finally, tRNA, or transfer RNA, that ferry amino acids to the ribosome to be assembled
