Bacterial porins transport
A) any hydrophilic molecule regardless of size.
B) hydrophilic molecules smaller than 600 Da.
C) any hydrophobic molecule regardless of size.
D) hydrophobic molecules larger than 600 Da.
E) any molecule regardless of properties or size.
Answer: B
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Bacteria that live attached to surfaces are described as ________, whereas bacteria that are free-living, floating with a fluid environment are described as ________.
Fill in the blank(s) with the appropriate word(s).
The Northern leopard frog (Rana pipiens) and Southern leopard frog (Rana utricularia) are morphologically similar, but they do not mate. They sound very different when calling for a mate. Which mechanism may explain why these frogs are listed as separate species?
A. the inability to interbreed because of morphological differences. B. the difference in bone structure and skin color of the organisms. C. DNA sequences of particular genes. D. the habitat of the organisms. E. both the DNA sequences of particular genes and the inability to produce viable offspring.
Which of the following is NOT characteristic of the
epidermis? a. stratified epithelium b. adipose c. keratinocytes d. melanocytes e. dendritic cells
A population of squirrels is in a phase of exponential growth. Which events would act to slow this growth? (Check all that apply)
A. heavy rainfall, resulting in larger seed and nut harvest B. logging of nut trees C. growth of the hawk population D. increased population that is outstripping food supply E. less competition from a diminished population of ground squirrels F. a forest fire that destroys habitat