What is the main force that moves blood throughout the system of blood vessels?
a. valve action
b. venous blood pressure
c. smooth muscle action
d. arterial blood pressure
Ans: d. arterial blood pressure
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According to the endosymbiosis theory of the origin of eukaryotic cells, how did mitochondria originate?
A) from infoldings of the plasma membrane, coupled with mutations of genes for proteins in energy-transfer reactions B) from engulfed, originally free-living proteobacteria C) by secondary endosymbiosis D) from the nuclear envelope folding outward and forming mitochondrial membranes
Which of the following defensive compounds produced by plants can harm an herbivore's nervous system?
A. terpenes B. alkaloids C. tannins D. phenols
Axial filaments are composed of
a. the outer membrane. b. endoflagella. c. axial fibers.
Which of the following statements about tunicates is incorrect?
A. Tunicates are sessile as adults. B. Tunicates are nonvertebrate chordates. C. Tunicate larvae can reproduce. D. Tunicates are all marine animals. E. Tunicate larvae are tadpole-like with all of the basic chordate characteristics.