What prevents a glucose molecule from moving back through a glucose transporter and leaving the cell?
a. phosphorylation
b. charge
c. closed transporters
d. gated transporters
e. concentration gradient
a
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Scientists examined the diversity of primary and secondary consumers from intertidal communities in four regions of the world:
Benguela along the coast of South Africa (BEN), California along the coast of North America (CAL), Humboldt along the coast of Chile in South America (HUM), and New Zealand (NZ). The number of organisms per square meter (mean density), which is a unit that represents total biomass of primary consumers (herbivores) and secondary consumers (carnivores), is plotted for each of these four regions on the graph below. Note: Image from Blanchette et al. (2009). Trophic structure and diversity in rocky intertidal upwelling ecosystems: A comparison of community patterns across California, Chile, South Africa and New Zealand. Progress in Oceanography 83: 107-116. After examining the graph, complete the following sentence. The black portion of each bar represents the percentage of [primary / secondary] consumers, whereas the gray portion of each bar designates the percentage of [primary / secondary] consumers from the four intertidal communities. What will be an ideal response?
Most CO2 reacts with water inside red blood cells to form bicarbonate, due to the activity of
__________. Fill in the blank(s) with the appropriate word(s).
One of the most common physical ailments is
a. encephalitis. b. meningitis. c. headache. d. seizure disorders. e. paralysis.
According to the endosymbiotic theory of the origin of eukaryotic cells, how did mitochondria originate?
A) from infoldings of the plasma membrane, coupled with mutations of genes for oxygen-using metabolism B) from engulfed, originally free-living prokaryotes C) by tertiary endosymbiosis D) from the nuclear envelope folding outward and forming mitochondrial membranes E) when a protoeukaryote engaged in a symbiotic relationship with a protobiont