What was the first stage of the process that led to the abiotic origin of life?
A) synthesis of monomers, such as amino acids and nucleotides
B) origin of self-replicating molecules
C) synthesis of polymers, such as proteins and nucleic acids
D) formation of pre-cells
A
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Sexual reproduction in the cellular slime mold Dictyostelium discoideum involves the production of special spores called
A. amoeba flagellates. B. sporozoites. C. discoidia. D. macrocysts.
Incubation conditions for anaerobic cultures include:
a. 30°C to 35°C. b. incubation for 48 hours before exposing the culture to air. c. incubation for at least 3 days before dis-carding. d. aerobic incubation of the broth medium with the cap loose.
Which human trait shows a continuous variation?
a. Cystic fibrosis b. Marfan syndrome c. Eye color d. Blood type e. Sickle cell anemia
Which characteristic enabled vertebrates to reproduce on land?
1.amniotic egg 2.dorsal nerve cord 3.endoskeleton 4.notochord