A mutation in the lacI gene prevents the gene product from binding allolactose. What will the expression level of the operon be in the absence of lactose?
A. no transcription
B. postive regulation
C. constitutively active
D. low level of expression
A
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Currently, the International Union for Conservation of Nature and Natural Resources (IUCN) does not monitor threats to:
a. vertebrates b. plants c. invertebrates d. mammals e. bacteria
The cyclic carbon fixation reactions are also known as the
A. citric acid cycle. B. tri carboxylic acid cycle. C. Calvin cycle. D. Krebs cycle.
Which statement best describes the composition of cell walls found in water molds?
a. All individuals have only walls made of cellulose. b. All individuals have only walls made of chitin. c. All individuals have only peptidoglycan walls. d. Some individuals have cell walls of chitin, and others have cell walls of cellulose. e. Some individuals have cell walls of chitin, some have cell walls of cellulose, and some have cell walls of both chitin and cellulose.
A fungus in the genus (Candida/Penicillium/Trichophyton) has recently been recognized as an opportunistic pathogen of AIDS patients
What will be an ideal response?