Which respiratory disease is caused by a bacterial infection?
A. the common cold
B. asthma
C. lung cancer
D. tuberculosis
E. cystic fibrosis
D. tuberculosis
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The heritability of a trait is the ____
a. sum of all phenotypic variation in a population b. average amount of genetic variation in each individual c. proportion of phenotypic variation that is caused by different genotypes d. absolute measurement of genotypic variation in a population e. proportion of phenotypic variation that is caused by the environment
Bacteria described as being coryneform have which of the following morphologic features?
a. Squared rods with squared ends arranged in pairs b. Short gram-positive cocci in branching chains c. Resemble and are often referred to as Chinese letters d. Long branching gram-positive bacilli
Resolution improves when the wavelength of the illuminating light decreases.
Answer the following statement true (T) or false (F)
Selective toxicity
A) harms the microbes without significantly harming the host. B) causes host damage without causing significant damage to the microbe. C) is the maximum tolerable dose of a drug per kilogram of body weight. D) is the same as the spectrum of activity for any given drug.