A.3′,3′,-phosphodiester bond
B.Glycosidic bond
C.3′,5′-phosphodiester bond
D.Peptide bond
第5题
A、All of the nucleotides of a gene that are transcribed into mRNA.
B、The nucleotides of a gene that make up the codons specifying amino acids.
C、The nucleotides of an mRNA molecule before the introns have been removed.
D、The amino acid sequence of a polypeptide.
第6题
A、Inactivated vaccine
B、Subunit vaccine
C、Nucleic acid vaccine
D、Subunit vaccine
第7题
A、genes are in the nucleus
B、genes are broken down by pepsin
C、genes are made of nucleic acid
D、genes are made of protein
E、none of the above
第9题
A、Course of disease
B、Experimental methodology
C、Personnel
D、Sampling factors
E、All above
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