What differentiates virulent strains of Streptococcus pneumoniae from nonvirulent strains?
A) the species-specific teichoic acid present in its cell wall
B) the type of Lancefield antigen it produces
C) the presence of a polysaccharide capsule
D) the type of toxins it produces
E) the extent of the hemolytic zone it produces when it is grown on blood agar
C
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Is produced along with water at the end of normal cellular respiration.
A) Cristae B) Electron transport chain C) Microtubules D) Glycolysis E) Flagella F) Plasma membrane G) Citric acid cycle H) ATP
In a recent TV documentary, the origins of several high profile personalities, like Oprah, were
examined and discussed. Oprah’s roots can be traced back to the west coast of Africa. How was this determined?
a. using DNA profiling. b. with genome analysis c. through therapeutic cloning d. via comparison of stem cells
A typical ovule has how many cells?
a. 4 b. 5 c. 6 d. 7 e. 8
An unknown chemical is analyzed and found to contain the bases thymine and guanine. This chemical is most likely
A. mRNA. B. tRNA. C. DNA. D. rRNA.