An abundance of nitrogen (N) and phosphorus (P) in an aquatic environment leads to __________ levels of dissolved oxygen due to _________
A. high; the oxidation of water
B. high; the abundance of anaerobic bacteria
C. low; reduction of oxygen
D. low; high aerobic respiration
D
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What is thought to be the origin of mitochondria and chloroplasts?
A. Cyanobacteria for mitochondria, purple bacteria for chloroplasts B. Purple bacteria for mitochondria, fungi for chloroplasts C. Purple bacteria for mitochondria, cyanobacteria for chloroplasts D. Algae for mitochondria, cyanobacteria for chloroplasts
Which one of the following processes is depicted in the figure above?
A) hyperpolarization of an axon bulb B) repolarization of a neuron C) synaptic transmission D) inhibition of a presynaptic neuron E) antagonistic effects of the parasympathetic and sympathetic nervous systems
The sporophyte generation
A. is diploid. B. is haploid. C. is not found in ferns. D. produces sex cells.
When these enzymes bind to a restriction site, they cut the DNA molecule into two molecules.
A. polymerases B. ligases C. restriction enzymes D. helicases