Which of the following cell processes depend on the movement of membrane components and would probably not be possible if membranes were rigid, nonfluid structures?
a) formation of intercellular junctions
b) secretion
c) all of these answers are correct
d) cell growth
Ans: c) all of these answers are correct
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Which statement best describes the evolutionary significance of mutualism?
A) Mutualism offers more biodiversity to a community. B) Individuals partaking in a mutualistic relationship are more resistant to parasites. C) Interaction increases the survival and/or population growth rate(s) of mutualistic species. D) Mutualistic interaction lessens competition in communities where it is present. E) Mutualistic relationships allow organisms to synthesize and use energy more efficiently.
Which of the following steps in prokaryotic binary fission is INCORRECT?
A. DNA is replicated bidirectionally from a single point on the circular chromosome. B. The two replicated chromosomes remain attached to the plasma membrane. C. The cell continues to grow outward symmetrically, separating the two chromosomes. D. Cell wall material is laid down at the midpoint to separate the two daughter cells. E. Construction of the plasma membrane and cell wall separates the two daughter cells.
How do defibrillators work?
a. they pump adrenalin into heart tissue. b. they deliver an electric shock to the heart’s pacemaker. c. they automate CPR. d. they massage the heart using remote sensors. e. they do a combination of more than one of these
In diffusion, molecules move towards areas of
a. lower concentration b. higher concentration c. the same concentration