An atom in which the number of electrons is different from the number of protons is called a(n)
a. ion.
b. molecule.
c. compound.
d. isotope.
e. acid.
A
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Apoplastic movement of water and minerals is possible until they reach which cell type?
A. epidermis B. xylem C. cortex cells D. pericycle E. endodermis
An infection caused by an opportunistic microbe after a primary infection has weakened the host's defenses is a ________ _________.
Fill in the blank(s) with the appropriate word(s).
When comparing members of archaea with bacteria
A. archaea were the first organisms and were followed by bacteria. B. the chemical nature of the cell wall of archaea and bacteria is identical and shows their early relationship. C. bacteria are not very diverse and are limited in distribution while archaea are far more diverse and found everywhere. D. the archaea and bacteria are cases of reduction in traits and are both derived from early eukarya. E. None of the choices are true.
Which of the following statements about bulk flow are correct?
I) Bulk flow is driven primarily by pressure potential. II) Bulk flow depends on a difference in pressure potential at the source and sink. III) Bulk flow depends on the force of gravity on a column of water. IV) Bulk flow may be the result of either positive or negative pressure potential. A) I and III B) II and III C) I, II, and IV D) I, II, III, and IV