Glucose
A. is preferentially used over lactose in E. coli as a result of catabolite repression.
B. levels are directly sensed via catabolite repression.
C. levels are the inverse of cAMP levels.
D. levels directly affect the production of lactose dehydrogenase.
E.
is preferentially used over lactose in E. coli as a result of catabolite repression AND glucose levels are the inverse of cAMP levels.
E
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Plasmids often encode for proteins
A) involved in translation. B) required for cellular growth. C) that confer resistance to antibiotics. D) involved in DNA replication.
Although we must be cautious about oversimplifying, when visible traits are markedly different among human races, a likely explanation is that the differences have been favored by:
A. natural selection and/or sexual selection. B. diversifying selection and/or stabilizing selection. C. allopatric speciation and/or sexual selection. D. disruptive selection and/or natural selection. E. sympatric selection and/or sexual selection.
Apoplastic movement of water and minerals is possible until they reach which cell type?
A. epidermis B. xylem C. cortex cells D. pericycle E. endodermis
In some organisms, a normal stop codon, UGA, encodes for the amino acid
A) leucine. B) arginine. C) isoleucine. D) selenocysteine. E) cysteine.