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

Biology & Microbiology

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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.

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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.

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Which human trait shows a continuous variation?

a. Cystic fibrosis b. Marfan syndrome c. Eye color d. Blood type e. Sickle cell anemia

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Which characteristic enabled vertebrates to reproduce on land?

1.amniotic egg 2.dorsal nerve cord 3.endoskeleton 4.notochord

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