You find a new organic molecule that is water soluble and contains the elements carbon, nitrogen, hydrogen, and oxygen. It is probably a
A. protein.
B. fat.
C. carbohydrate.
D. phospholipid.
A. protein.
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Refer to Figure 7-2. The line on the graph labeled B represents the:
a. activation energy with an enzyme.
b. activation energy without an enzyme.
c. free energy of the reactants.
d. change in entropy.
e. change in enthalpy
Which of the following is not one of the functions of the cytoskeleton?
a. To provide a structural framework for the cell b. Cell locomotion c. Protein translocation into the ER d. Intracellular movement of organelles and other structures
The connection between structure and ________ is a basic concept of biology
A) species B) adaptation C) function D) sex
Na+ ion concentrations are higher outside the cell than inside the cell. What type of transport system is required to move Na+ ions in and out of the cell?
A. Na+ moves into the cell by facilitated diffusion and can not move out of the cell B. Na+ moves in and out of the cell by active transport C. Na+ moves into the cell by facilitated diffusion and out of the cell by active transport D. Na+ moves in and out of the cell by passive diffusion E. Na+ moves into the cell by active transport and out of the cell by facilitated diffusion