The disease known as "Croup" is often a result of infection with which of the following?
A) hantavirus
B) influenzavirus
C) Bordetella pertussis
D) Mycoplasma pneumoniae
E) respiratory syncytial virus
E
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Which of the following is not a member of the phylum Platyhelminthes?
a. fluke b. tapeworm c. flatworm d. ribbon worm
The table below lists several genotypes associated with the lac operon in E. coli. For each, indicate with a "+" or a "-" whether ?-galactosidase would be expected to be produced at induced levels
?-Galactosidase Production Genotype No Lactose With Lactose (a) I + O+ Z+/F' I - O+ Z+ (b) I - Oc Z -/F' I - Oc Z - (c) I - Oc Z+/F' I - O+ Z+ (d) I s Oc Z -/F' I s O+ Z+ I + = wild-type repressor I - = mutant repressor (unable to bind to the operator) I s = mutant repressor (insensitive to lactose) O+ = wild-type operator Oc = constitutive operator (insensitive to repressor)
Which of the following alternatives would lead to an interpretation of the relationship of extinction to number of species present different from the one depicted in Figure 20.23?
A) The probability of extinction per species increases with increasing diversity as competitive exclusion becomes more likely. B) The probability of extinction per species decreases with increasing diversity as mutualistic relationships buffer processes that lead to extinction.
The basic building block of a protein is called a (n)
a. fatty acid. b. monosaccharide. c. amino acid. d. gene.