In the tropisms with which it is involved, auxin causes ____
a. rapid cell division
b. hardening of cell walls
c. cell elongation
d. increased plasma membrane permeability
e. increased protein synthesis
ANSWER: c
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Which of the following statements is false?
A. Circulation requires a pump to generate pressure to drive flow, whereas ventilation does not. B. Ventilation maximizes the concentration of oxygen in the air on the outside of the respiratory surface. C. The same amount of oxygen enters the blood through diffusion as is transported by circulation. D. Oxygen and carbon dioxide both move across the respiratory surface by diffusion. E. Larger, more complex animals rely on bulk flow and diffusion to deliver oxygen to their cells, whereas some simpler animals rely on diffusion alone.
Before differentiation can begin during the processes of plant cell and tissue culture, parenchyma cells from the source tissue must
a. differentiate into procambium. b. undergo dedifferentiation. c. increase the number of chromosomes in their nuclei. d. enzymatically digest their primary cell walls. e. establish a new polarity in their cytoplasm.
Enzymes dissolve holes in the extracellular matrix then ___ cells grow and migrate out towards the tissue that sent the growth factors
a. endothelial b. neuronal
For two linked genes, the maximum percentage of recombinant offspring seen in a test cross is ________ assuming crossing over occurs 100% of the time between the two genes.
a) 25% b) 50% c) 75% d) 100%