The ectoderm, mesoderm, and endoderm are formed during the ____ stage of embryogenesis
A. fertilization
B. cellular blastoderm
C. syncytial blastoderm
D. gastrulation
D
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What region in eukaryotic genes usually contains the majority of regulatory elements?
A. 0 to 50 B. -50 to 0 C. -50 to -100 D. -100 to -150
In the process of DNA replication, nucleotides are added as DNA is synthesized. Which best describes how it is determined what nucleotides are added?
A) The nucleotides are added to exactly match the sequence on the original strand. B) The free nucleotides that are in the greatest supply in the cell are added first. C) The nucleotides are added based on the complementary pairing of bases. D) The nucleotides are added randomly.
Osmosis moves water from a region of
A) high solute concentration to a region of low solute concentration. B) low solute concentration of to a region of high solute concentration. C) low concentration of water to a region of high concentration of water. D) negative osmotic potential to a region of positive osmotic potential. E) hypertonic solution to a region of hypotonic solution.
Biomass is a renewable energy source derived from the organic matter produced by living organisms. All of the following are sources of biomass EXCEPT
A) oxidation of metals. B) crops. C) bacteria. D) landfill sites. E) algae.