Protection Mechanism II: spatial
What will be an ideal response?
Aquatic cyanobacteria develop special cells called heterocysts to fix N2
--nitrogen fixation requires specialized structures (there's a heterocyst)
-light vs fluorescence microscopy
-A cyanobacteria, Anabaena, with fluorescent vegetative cells and 'dark' heterocyst cells.
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As a plant cell grows and matures, additional layers are added to the cell wall to construct the more rigid ____,
a. middle lamella b. secondary cell wall c. primary cell wall d. plasma membrane e. central vacuole
Ribosomes function as
a. 1 unit. b. 2-part units. c. 3-part units. d. 4-part units. e. a multidivisional unit.
An example of a primary sex characteristic is _______.
A. facial hair B. penis C. deeper voice D. all of the above
A nerve impulse does not vary in intensity with regard to the strength of the stimulus. What do we call this phenomenon?
A) resting membrane potential B) refractory period C) all-or-nothing principle D) graded response