The selective permeability of a cell membrane is due to ____
a. the hydrophobic core formed by the phospholipid tails
b. the hydrophilic end facing the cell exterior
c. glycolipids on the surface of the membrane
d. the position of cholesterol in the membrane bilayer
e. the hydrophilic core formed by the phospholipid tails
A
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Which of the following is not a mechanism to circumvent the limits imposed by diffusion?
A. placing metabolically active cells in the interior of an organism and metabolically inert structures along the exterior surface B. using vascular tissue to transport materials throughout the plant body C. placing metabolically active cells along a series of canals and pores D. using a circulatory system to distribute materials throughout the animal body E. All of these options are mechanisms to circumvent the limits of diffusion.
The choanocytes have a flagellum that moves water through the sponge and a collar that extracts food particles from the water. In what group have you encountered very similar cells before?
A. the choanoflagellates B. the chytrids C. the Euglenozoa D. the charophytes E. the Foraminifera
Deep-sea vent bacteria do not rely on the sun as a source of energy
Indicate whether the statement is true or false
DNA is removed from the genome and moved to a new position.
Match the description with the appropriate term.