A farmer has a localized, painful skin infection. Cultures are set up, and <-hemolytic, cata-lase-negative, and gram-positive bacilli are isolated. Based on this information, which of the fol-lowing biochemical results are expected—urease, H2S production in TSI, and nitrate reduction?
a. Positive urease, positive TSI, and positive nitrate
b. Positive urease, negative TSI, and nega-tive nitrate
c. Negative urease, positive TSI, and nega-tive nitrate
d. Negative urease, negative TSI, and nega-tive nitrate
C
The organism is Erysipelothrix, which is negative for urease and nitrate but produces H2S in a TSI slant.
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A heart attack occurs when cardiac cells receive an inadequate supply of ____
a. glucose b. calcium c. sodium d. oxygen e. potassium
Nuclear transfer is a preferred method of cloning over embryo splitting because it ____
a. is less technical b. is more natural c. results in a larger number of cloned offspring d. produces both male and female offspring from the same clone e. uses haploid nuclei
The mutant fly in Figure 17-2 illustrates all of the following except:
a. the existence of homeotic genes in Drosophila.
b. the concept of nuclear equivalence.
c. mutations in genes affecting segment identity.
d. an altered phenotype due to a mutant allele.
e. a structure containing many nuclei residing in a common cytoplasm
Which is an example of a population?
A) all of the microorganisms on your skin B) all of the students in your classroom C) all students attending colleges and universities in your state D) the various plants found in prairies in the western United States