An operon is:
A. a gene coding for a repressor protein.
B. a region of DNA consisting of the
promoter, operator, and coding sequence for
structural proteins.
C. a region of DNA consisting of the operator
and coding sequence for structural proteins.
D. a region of DNA consisting of the promoter
and operator sequences needed to regulate
one or more structural genes.
E. a single molecule of RNA coding for more
than one protein.
B
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Which pathway(s) is used to fix carbon dioxide?
A. Entner-Doudoroff B. Reductive tricarboxylic pathway C. Glycolysis D. Pentose phosphate pathway
Insertions and deletions of single nucleotides:
A. cause nonsense mutations. B. cause frameshift mutations. C. add or delete amino acids to/from the normal polypeptide. D. shorten chromosomes. E. cause cancer.
The ingestion of fecal material for further extraction of nutrients is referred to as
A) nectarivory. B) coprophagy. C) folivory. D) autophagy.
Nucleotides have a phosphate group attached at the ________ carbon atom of the sugar.
A. 3' B. 2' C. 5' D. 1'