All cells possess a _____________
a. cell wall
b. nucleus
c. plasma membrane
d. nucleolus
c
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While examining the leaves of an Elodea (a popular water plant) under a microscope, the large green chloroplasts can be seen streaming through the cells as if pushed by a water current. What junction might be the source of this cytoplasmic streaming in the Elodea leaves?
a. desmosome b. tight junction c. plasmodesmata d. gap junction
Contraction of the diaphragm ____
a. diminishes the volume of the thoracic cavity b. increases the volume of the thoracic cavity c. pushes the rib cage downward d. causes external intercostal muscles to relax e. decreases lung capacity
What does evolutionary fitness measure?
A. longevity B. relative reproductive success C. physical health D. population size
Lipid rafts are associated with which of the following activities?
A) responding to extracellular signals B) transport of nutrients across cell membranes C) immune responses D) transport of cholera toxin into cells E) All of the above are correct.