How are C4 plants able to increase the concentration of CO2 at rubisco?
A. by operating the C4 acid cycle faster than
the Calvin cycle
B. by suppressing photorespiration
C. by using ATP to produce PEP
D. by fixing HCO3
- instead of CO2
E. by using PEP carboxylase, which is not
affected by O2
A
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Temperature is perhaps the most important factor in the distribution of organisms because
A. water is more scarce in warmer environments. B. most organisms are unable to regulate their body temperature precisely. C. many organisms are able to grow faster in warmer climates. D. the metabolic optimum for endothermic animals is in temperate areas. E. wind amplifies the effect of cool temperatures.
Which list is organized from smallest to largest level of organization of life?
a. organelles, cells, tissues, organs, organ systems, organisms b. organelles, tissues, cells, organ systems, organs, organisms c. cells, tissues, organ systems, organelles, organs, organisms d. organisms, organ systems, organs, tissues, cells, organelles e. tissues, cells, organelles, organs, organ systems, organisms
Lobsters and clams have _____ in common with fishes
a. external gills b. a two-chambered heart c. internal gills d. skin as a respiratory surface e. an open circulatory system
As an example of a(n) _____, household bleach can be characterized as having a _____.
A) neutral solution; pH of more than 10 B) base; pH greater than 7 C) base; pH less than 7 D) acid; proton concentration less than 1 x 10-7M