Which of the following statements about the bacterial ribosome is nottrue?
A. The 70S ribosome is a complex of 50S and 30S subunits.
B. The entire protein component of the 30S subunit is a single polypeptide chain.
C. Each ribosomal subunit contains at least one RNA molecule.
D. An rRNA molecule, rather than protein, catalyzes peptidebond formation.
B
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Which of the following is not a true statement about the scientific method?
A. It does not apply to problems encountered in everyday life. B. It is a framework to consider evidence in a repeatable way. C. It is a framework to consider ideas in a repeatable way. D. It is a general way of organizing an investigation. E. It begins with observations.
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What phenotype would you expect to see in a strain of E. coli with a mutation in the phr gene?
A) decrease in UV-induced mutations B) increase in UV-induced mutations C) decrease in reversion of base-pair substitution mutations D) increase in the methylation of nucleotide bases E) decrease in the methylation of nucleotide bases
Describe some of the environmental risk factors associated with ASDs
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