Which of the following is not a cellular activity associated with microtubules?
A) maintenance of axons
B) cell shape
C) orientation of cellulose microfibrils
D) cilial structure
E) mititotic spindle
D) cilial structure
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You have before you a living organism, which you examine carefully. Which of the following should convince you that the organism is acoelomate?
A) It is triploblastic. B) It has bilateral symmetry. C) It possesses sensory structures at its anterior end. D) Muscular activity of its digestive system distorts the body wall.
What is the role of the apical complex in apicomplexans?
A. The apical complex is a defensive structure that is used to destroy bacteria. B. The apical complex enables the apicomplexan to penetrate and bore into a host cell. C. The apical complex is a motility structure that enables cell movement. D. The apical complex is a feeding structure through which small food particles are taken in.
There is genetic evidence of interbreeding
between Homo neanderthalensis and H. sapiens about ___ years ago but not after ___ years ago.
a. 6000---4000 b. 60,000---40,000 c. 600,000---400,000 d. 600---400 e. there is no genetic evidence of interbreeding between these two species
The process by which water is lost by evaporation from plant parts is known as:
a. vaporization. b. photosynthesis. c. guttation. d. transpiration. e. abscission.