Spiegelman and colleagues demonstrated natural selection in RNA replications because in their experiments:
a. RNA molecules had differential survival and replication rates.
b. RNA was self-replicating.
c. the researchers chose which RNA molecules to replicate.
d. RNA was copied into DNA.
A
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All of the genes located on a given chromosome
constitute a. a karyotype. b. a bridging cross. c. a wild-type allele. d. a linkage group. e. none of these.
In humans, the 30S pre-RNA transcript yields three rRNA segments following transcription and RNA cleavage. What RNA transcripts are generated by the 30S pre-RNA transcript in E. coli?
A) two rRNAs (15S each) B) three rRNAs (5S, 16S, and 23S) C) two tRNA transcripts D) three rRNAs (5.8S, 18S, and 28S) and two tRNA transcripts E) three rRNAs (5S, 16S, and 23S) and two tRNA transcripts
A molecule composed of carbon and hydrogen is a compound
Indicate whether the statement is true or false
Which of the following diseases can be prevented by vaccination?
A) typhoid fever B) salmonellosis C) cat scratch disease D) gonorrhea E) chancroid