Which of the following is not a specialized function of epithelial coverings?
a. exchange of gases
b. secretion of lubricants
c. receiving sensory signals
d. facilitation of flexibility for movement
e. temperature regulation
D
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In which of the following steps of transcription is the C-terminal domain of RNA polymerase II first phosphorylated?
A. assembly of the preinitiation complex B. initiation C. elongation D. termination complex formation E. after termination
Where are most glucose transporter proteins ("GLUTs") located when levels of the hormone insulin are LOW?
A. inserted into the plasma membrane B. in the membranes of intracellular vesicles C. inserted into the nuclear membrane D. in the endoplasmic reticulum E. in the liver—They are transported to other cells when glucose levels rise.
The respiratory surfaces of mammalian lungs are called ____
a. alveoli b. bronchi c. tracheae d. bronchioles e. air sacs
Compared to the moss, the fern is better adapted to life on land because the fern
a) does not have a swimming sperm, but the moss does. b) can be found in dry areas, but moss cannot. c) has vascular tissue, but the moss does not. d) produces seeds, but the moss does not. e) does not have a gametophyte generation, but the moss does.