Which feature is believed to have been the first step in the evolution of land plants from the green algae?
A. evolution of vascular tissue
B. evolution of seeds
C. evolution of flowers in order to attract pollinators
D. protection of the embryo
E. evolution of microphylls
Answer: D. protection of the embryo
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ETEC strains produce one of two heat-________ diarrhea-producing ________
A) stable / endotoxins B) labile / endotoxins C) stable / enterotoxins D) labile / enterotoxins
Nucleophilic attack:
A. is carried out by a strongly electronegative atom such as carbon or hydrogen. B. can result in the formation of the transition state of the reaction. C. by an OH (hydroxyl) group on an inorganic phosphate molecule can cause hydrolysis of a chemical bond. D. occurs when a weakly electronegative atom attacks a strongly electronegative atom. E. never forms bonds between reactants and the enzyme active site.
Chloramphenicol is an antibiotic that targets prokaryotic (70S) ribosomes, but not eukaryotic (80S) ribosomes. Which of these questions stems from this observation, plus an understanding of eukaryotic origins?
A) Can chloramphenicol also be used to control human diseases that are caused by archaeans? B) Can chloramphenicol pass through the capsules possessed by many cyanobacteria? C) If chloramphenicol inhibits prokaryotic ribosomes, should it not also inhibit mitochondrial ribosomes? D) Why aren't prokaryotic ribosomes identical to eukaryotic ribosomes?
Hydrophobic
What will be an ideal response?