Plants have cell walls to give them more structural strength. In order to facilitate movement of molecules from one plant cell to another, there are channels called ___________________ that run through the cell walls.
a. vacuoles
b. transport vesicles
c. plasma membranes
d. desmosomes
e. plasmodesmata
Ans: e. plasmodesmata
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Consider a nerve cell with an internal Cl- concentration of 50 mM, a membrane potential of 60 mV and an external Cl- concentration of 100 mM. Each of the following is true for Cl- import into the cell except
A) import is down a concentration gradient. B) import is down an electrochemical concentration gradient. C) import ?G is positive. D) import requires energy input. E) All are true.
The marine multicellular protists including the larger brown algae belong to the
A. euglenoids. B. Choanoflagellida. C. Stramenopiles. D. dinoflagellates. E. foraminifera.
Symptoms are
A) subjective characteristics of a disease that only the patient can feel. B) objective manifestations of a disease that can be measured. C) objective manifestations of a disease that can be observed by others. D) characteristics of a disease, such as sweating. E) laboratory tests used to diagnose a disease.