How do mineral ions get into the xylem cells of a plant root by way of the intracellular route?
A) They travel between root cells to the xylem and then enter a xylem vessel.
B) They are actively taken in to the xylem of root hairs.
C) They are taken up by root hair cells and transferred from cell to cell via plasmodesmata.
D) They move in solution through cell walls of the endodermis.
Answer: C
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The simplest nervous system found in nature is the nerve net. An example of an organism that senses and responds to its environment with this ancient system would be
A. a jellyfish. B. a cockroach. C. an earthworm. D. a frog. E. a fiddler crab.
Gregor Mendel was successful in his analysis of the genetics of pea plants because
a. he examined and analyzed both the F1 and F2 generations. b. he studied the parental plants to determine their differences. c. pea plants have genetics different from other organisms. d. he decided to only look at his results in an objective manner. e. he studied a trait that had a strange inheritance pattern.
The concentration of H+ ions inside the mitochondrial matrix is lower than it is in the cytosol or the mitochondrial intermembrane space
What would be the immediate effect of a membrane-permeable compound that carries and releases protons into the mitochondrial matrix? (a) inhibition of the electron-transport chain (b) inhibition of ATP synthesis (c) increased import of ADP into the matrix (d) inhibition of the citric acid cycle
In human lungs, where does gas exchange
occur?
a. the pharynx b. the alveoli c. the trachea d. the bronchioles e. more than one of these