Plasmodesmata ______________________.
(a) permit small molecules to pass from one cell to another
(b) are found only in animal cells
(c) are closed by the neurotransmitter dopamine
(d) provide tensile strength
Ans: (a) permit small molecules to pass from one cell to another
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The contents of the xylem sap in plant roots are:
A. the same as the solute composition of the surrounding soil. B. always high in sugars. C. always higher in water than the surrounding soil. D. selectively maintained by endodermal cells. E. very acidic.
While analyzing data from the prior week, a chemist determines that she has discovered a new type of atom. While the atom has the same number of protons as nitrogen, the number of neutrons is different. What has she discovered?
a. an isomer b. an ion c. an isotope d. a compound
What is a colonial green algae that forms the whirling spheres found in fresh water?
a. nori b. Porphyra c. kelp d. Volvox e. Ulva
During respiration most ATP is formed as a direct result of the net movement of
A. Potassium against a concentration gradient B. protons down a concentration gradient C. electrons against a concentration gradient D. electrons through a channel E. sodium ions into the cells