Bacteria in the phylum Firmicutes are distinguished from the phylum Actinobacteria on the basis of
A. their Gram stain reaction.
B. the high G + C content of their DNA.
C. their spiral shapes.
D. the low G + C content of their DNA.
E. the presence of LPS in their membranes.
Answer: D
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The highest free energy of a reaction is found in the _____________(s) of that reaction
A. product B. substrate C. transition state
The Irish potato famine in the mid-1840s was caused by a heterotrophic protist, Phytophthora infestans, which caused widespread infection of potato plants. It was successful in infecting because it was
A. a protozoan, with flagella, and swimming to potato plants in wet seasons, engulfing and digesting the potato cells. B. a red algae, able to perform photosynthesis, allowing its cells to spread from the coast to potato farm fields. C. a water mold, and its soft, fleshy filaments benefitted from several rainy seasons. D. a diatom, with a silica shell allowing it to survive the soil conditions in which potatoes grow as specialized roots. E. a ciliate, which has filaments very similar to water and slime molds.
Where do antigen-presenting cells interact with
T cells?
a. the thymus b. the pituitary gland c. the lymph nodes d. the adrenal glands e. the red bone marrow
A new antibiotic is developed that interferes with the way tRNA fits into bacterial ribosomes. How would this kill the bacteria?
A) The bacteria would be unable to produce necessary enzymes to carry out basic metabolism. B) The tRNA would be unable to carry out transcription. C) Ribosomes would not be able to produce mRNA, and cell functions would halt. D) tRNA would not unwind the DNA to allow DNA polymerase to copy it; thus, cell division would stop.