Which branch of this phylogenetic tree identifies Eukarya?
a. A
b. B
c. C
d. D
e. E
E
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All of the following are functions of proteins embedded in the plasma membrane EXCEPT ____
a. transport of substances in and out of the cell b. generation of ATP c. recognition of signal molecules d. adherence to molecules on the surface of other cells e. recognition of "like" cells
Which of these statements about snakes is
false? a. All snakes are carnivores. b. All snakes use internal fertilization. c. All snakes are venomous. d. All snakes have flexible skull bones and hinged jaws. e. Some snakes retain skeletal remnants of hindlimbs.
The portion of the molecule in box 3 of Figure 12-1 is:
a. a sugar.
b. a protein.
c. a pyrimidine.
d. a purine.
e. a nucleotide.
Bacteria able to perform the NH4+ + NO2- ? N2 + 2H2O reaction have been discovered in laboratory bioreactors and wastewater treatment systems. Researchers predicted that these bacteria should exist in oceans
They measured the concentration of NH4+, NO2-, NO3-, and O2 in the Black Sea as a function of water depth (M. Kuypers et al. 2003 Anaerobic ammonium oxidation by anammox bacteria in the Black Sea. Nature 422:608-11 ) to determine where in the sea the bacteria might live. Analyzing data presented in the figure above, at what depth would you expect to find the bacteria? (Note: In the figure, different scales are used to show concentrations of NH4+, NO2-, NO3-, and O2.) A) in the top 50 meters B) at a depth of 75 meters C) at a depth of 92 meters D) below 100 meters