Phospholipids assemble spontaneously into bilayers driven by the attraction of their "tail" portions to each other and of their "head" portions to each other. The tail regions are:
A) hydrophilic.
B) hydrophobic.
C) molecularly charged.
D) adhesive.
E) cohesive.
B) hydrophobic
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Which of the following emergence factors has contributed to the HIV/AIDS epidemic?
A) climate change B) rapid pathogen adaptation and change C) increasing travel to endemic areas D) exotic pet and meat trade
Archaeans resemble bacteria by the ____, and resemble eukaryotes by the ____
a. lack of membrane-bound organelles; presence of a nucleus b. presence of similar cell wall proteins; presence of similar rRNA sequences c. ability to perform aerobic respiration; presence of similar cell wall proteins d. lack of membrane-bound organelles; presence of introns e. presence of nucleoid region; lack of a nuclear envelope
The evolution of multicellularity was important for organisms for all of the following reasons
EXCEPT?
a. It allows for the creation of a sustainable internal fluid environment. b. It allows for occupation of diverse habitats. c. It allows for cellular specialization. d. It allows for an increase in the size of an organism. e. It allows for mutualisms with single cell organisms.
Bile is stored and released by the ____
a. pancreas b. gallbladder c. liver d. duodenum e. stomach