The fluid nature of the membranes is attributed to a lateral movement of
A. protein channels.
B. phospholipid molecules.
C. antigen molecules.
D. pumps such as the proton pump.
E. the entire lipid bilayer.
B
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Four of the five choices listed below are types of
prezygotic isolating mechanisms. Select the exception. a. temporal b. hybrid inviability c. mechanical d. ecological e. gamete
The stretch sensors of the sensory neurons in the human knee-jerk reflex are located in the _____
A) cartilage of the knee B) quadriceps muscles on the front side of the thighs C) hamstring muscles on the back side of the thighs D) brain, the sensorimotor relay
What are the two organ systems of a vascular plant body?
A. Shoots and roots B. Stems and leaves C. Stems and roots D. Leaves and roots E. Leaves and flowers
The ________ is the most prevalent form of a gene in a population.
Fill in the blank(s) with the appropriate word(s).