(A)________ is the developmental process of forming three germ layer: ectoderm, mesoderm and endoderm. The ectoderm will differentiate into (B)_________________.
a. (A) gastrulation (B) skin and nervous system
b. (A) gestation (B) skin and nervous system
c. (A) gastrulation (B) muscle and bones
d. (A) gestation (B) muscle and bones
Answer: a. (A) gastrulation (B) skin and nervous system
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Oil and natural gas are predominantly composed of the remains of
a. multicellular animals. b. phytoplankton. c. fungi. d. multicellular plants. e. gelatinous zooplankton.
Following with of these time periods was there
NOT a mass extinction?
a. Ordovician b. Devonian c. Permian d. Silurian e. Triassic
Plants use what form of nitrogen to make the building blocks for proteins and nucleic acids?
a. nitrogen gas b. nucleic acids c. ammonium d. urea e. nitrous oxide
What might be a reasonable function of restriction endonucleases in a bacterium, distinct from their use by molecular biologists?
What will be an ideal response?