Facilitated diffusion of magnesium ions (Mg++) would occur out of a cell if the Mg++ concentration was ________ outside the cell than inside, and ________.
A) higher; Mg++ could move directly through the phospholipid bilayer of the membrane
B) lower; Mg++ could move directly through the phospholipid bilayer of the membrane
C) the same; Mg++ could move directly through the phospholipid bilayer of the membrane
D) higher; Mg++ could move through a transport protein across the membrane
E) lower; Mg++ could move through a transport protein across the membrane
B) lower; Mg++ could move directly through the phospholipid bilayer of the membrane
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The term used when an organism is studied in its natural environment is
A) au naturale. B) in vitro. C) in situ. D) in toto.
Which of the following is NOT true about how communities of cells interact within tissues?
A. All cells in a tissue carry out the same function independently. B. Cells communicate with neighboring cells and their environment. C. Cells stick together to function together in a tissue. D. Cells carry out specialized functions within a multicellular organism. E. All cells require energy to function.
George Beadle and Edward Tatum discovered the key step in showing that genes produce ____________________
through the action of proteins. Fill in the blank(s) with the appropriate word(s).
How is natural selection related to sexual reproduction as opposed to asexual reproduction?
A) Sexual reproduction results in many new gene combinations, some of which will lead to differential reproduction. B) Sexual reproduction results in the greatest number of new mutations. C) Sexual reproduction allows the greatest number of offspring to be produced. D) Sexual reproduction utilizes far less energy than asexual reproduction.