Which statement is NOT correct about the lac operon?
A. It regulates the production of a series of five enzymes.
B. It is normally turned off if glucose is present.
C. It is an inducible system.
D. The structural genes make products that allow lactose metabolism.
E. Lactose binds to the repressor protein and inactivates it.
Answer: A
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The physical traits of an organism are called its __
A. phenotype B. allele C. genotype D. gene
The selective advantage linked to the high frequency of the cystic fibrosis allele in Caucasians is:
a. an increased resistance to falciparum malaria. b. the prevention of excessive water loss associated with certain types of diarrhea. c. production of an enzyme to break down cholera toxin. d. increased mucous secretions for the removal of infectious cells. e. an increased probability of Salmonella infection.
____ directly deliver blood to the glomeruli
a. Afferent arterioles b. Efferent arterioles c. Peritubular capillaries d. Renal arteries e. Renal venules
A microbe that grows only at the bottom of a tube of thioglycollate medium is probably a(n)
A. obligate aerobe. B. facultative anaerobe. C. aerotolerant anaerobe. D. microaerophile. E. obligate anaerobe.