Which of the following is NOT a part of the mitotic spindle apparatus in plants?
A. centrosome
B. centrioles
C. tubulin proteins
D. kinetochore microtubules
E. astral microtubules
B. centrioles
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The reaction (H2 + F2 ? 2HF) is an example of a redox reaction. In reality, two half reactions are occurring. The half reaction (H2 ? 2H+ + 2e- ) is a(n):
A. potential energy reaction B. redox reaction C. oxidation reaction D. reduction reaction
Many signal transduction pathways utilize second messengers to ____
a. transport a signal through the lipid bilayer of the plasma membrane b. relay a signal from the outside of the cell to the inside c. relay a signal from the inside of a cell membrane to the outside of the cell d. decrease the message once the signal molecules have left the receptor e. relay the message from the inner surface of the plasma membrane throughout the cytoplasm
The different seasons of the year are due to the
A. tilt of Earth's axis as it travels around the sun. B. distance from Earth to the sun. C. rotation of Earth on its axis. D. rotation of the moon around Earth. E. gravitational pull of the moon as it travels around Earth.
Which set of terms refers to the control of cardiac output?
a. baroreceptors, brainstem, heart b. heart, baroreceptors, brainstem c. brainstem, heart, baroreceptors d. brainstem, baroreceptors, heart