Water diffuses through certain organs such as the kidneys and bladder much faster than would occur by passive diffusion through a lipid bilayer alone. What accounts for this more rapid rate of water transport in these organs?
A. the composition of lipids changes to promote water transport
B. the presence of molecules that bind water and change its membrane permeability properties
C. presence of an ATP-driven enzyme for water transport
D. presence of a water pump
E. presence of aquaporin channels for facilitated diffusion of water
Answer: E
You might also like to view...
How are the bryophytes and seedless vascular plants alike?
A) Plants in both groups have vascular tissue. B) In both groups, sperm swim from antheridia to archegonia. C) The dominant generation in both groups is the sporophyte. D) Plants in both groups have true roots, stems, and leaves.
Purines and pyrimidines are precursors for synthesis of ________.
A. fatty acids B. peptidoglycan C. nucleic acids D. proteins
Proteomics is the ________
A) changing of the terminal sequences of proteins to alter their function B) process of defining the complete set of proteins encoded by a genome C) harvesting of proteins from a cell to determine their economic value D) rational design of drugs based on protein structure E) manipulation of amino acid sequences in proteins to alter their function
The inputs of cellular respiration are oxygen and sugar; the outputs of cellular respiration are:
A) carbon dioxide, glucose, and fructose. B) water and energy in the form of ADP. C) water, glucose, and sucrose. D) carbon dioxide, water, and ATP. E) ATP and methane