In eukaryotic cells, replication proceeds from ________ origin(s) of replication.
A) zero
B) one
C) two
D) many
D) many
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The nucleus of an atom is composed of
A. protons. B. neutrons. C. electrons. D. protons and neutrons. E. protons and electrons.
Cyanobacteria
a) can fix nitrogen, thus causing many freshwater ecosystems to be limited by phosphorus availability. b) can mineralize phosphorus from wetland sediments, raising phosphorus levels in inland waters to the point of eutrophication. c) mineralize the phosphates in detergent from an organic corm into an inorganic form that can cause algal blooms and eutrophication. d) consume excess N and P in inland waters and so are essential tools for watershed restoration and management e) occur when aquatic ecosystems are disrupted by invasive species, and can cause pathogenic infections of native species, further enhancing the invasive nature of introduced exotic invaders.
Differentiate between the following terms: primates, anthropoids, hominoids, and hominids. What will be an ideal response?
How could an embryonic stem cell be used to repair a severed spine?
A) Embryonic stem cells secrete proteins that repair all other cell types, including nerve cells. B) Embryonic stem cells can grow into any other cell type, including a nerve cell. C) Embryonic stem cells can cause any other cell type to multiply. D) Embryonic stem cells are primarily involved with neural growth and development.