Which group is geologically oldest?
a. prokaryotes
b. dinosaurs
c. humans
d. plants
e. bony fish
A
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In a particular E. coli strain, a mutation in the thiMD operon results in improper formation of the stem loop secondary structure making it impossible to bind TPP. There are two enzymes encoded by the thiMD operon
How many of the enzymes encoded in the thiMD operon are translated? A. two B. zero C. three D. one
A group of three nucleotides on mRNA is called a(n)
A. codon. B. anticodon. C. exon. D. intron.
The nuclear genetic code is considered universal with a few exceptions. Some of these exceptions are found when comparing the nuclear genetic code of humans to what?
A) acterial genetic code B) human mitochondrial genetic code C) angiosperm's genetic code D) phage M2 genetic code E) chimpanzee's genetic code
A common source of antibiotics is
A. Acetobacter. B. Aspergillus oryzae and Lactobacillus. C. Lactoccocus cremoris. D. Streptococcus thermophilus. E. Streptomyces.