lacIS encodes superrepressors, repressors that always bind to the operator and prevent gene transcription
Indicate whether the statement is true or false
TRUE
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What stimulates a muscle cell to contract?
A. an impulse from a sensory neuron B. an impulse from a motor neuron C. auto-depolarizing cells in the membrane of muscle cells D. hormones
Habitat fragmentation can reduce biodiversity by ____
a. withdrawing an essential resource from native species b. sterilizing for pollution control c. eliminating vast tracts of forests d. introducing more native species into a habitat e. decreasing human use of natural resources
A disease that occurs more or less all the time is classified as ____
a. epidemic b. pandemic c. endemic d. nosocomial e. maldemic
Which of the following makes its own food using energy and simple raw materials it obtains from nonbiological sources?
A. Producer B. Nutrient C. Consumer D. Cell E. Protist