HEPA filters are able to filter many airborne viruses
a. true
b. false
Ans: a. true
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Mycoplasma
A. lack peptidoglycan. B. are the smallest free-living organisms. C. have sterols in their membranes. D. are killed by penicillin. E. lack peptidoglycan, are the smallest free-living organisms AND have sterols in their membranes.
What characterizes a bacterial cell that can undergo transformation?
What will be an ideal response?
Maturation promotion factor (MPF), discovered by Masui and Markert, is the factor that
a. is missing in the cdc2 mutant in yeast. b. induces entry into meiosis when injected into frog oocytes. c. fluctuates in amount during early cleavages of sea urchin eggs. d. fluctuates in amount during the cell cycle of mammalian cells.
Which would be most likely to be fossilized?
A. a common thick-shelled crustacean. B. a common large worm. C. an herbaceous plant that is only found at very high altitudes. D. a rare, desert-dwelling lizard.