Animals that have no circulatory systems tend to be
a. small.
b. cylindrical.
c. flattened.
d. composed of filaments made of cells.
e. any of these.
Answer: e
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Mitochondrial disorders can be caused by mutations in all the following except:
A. mitochondrial DNA B. nuclear DNA C. cytoplasmic DNA
Which of these is a negative consequence of solid waste pollution?
A.People and wildlife are exposed to hazardous chemicals B.Contamination of ocean waters (garbage patches) C.Disruption of ecosystem services D.A and B are true. E.A, B and C are true.
If two populations of a species show significant structural differences, it is likely that
A. there is little sexual reproduction between populations. B. they are reproductively isolated. C. each is specifically adapted to a certain environmental situation. D. All of the choices are correct.
Climbing plants, such as vines, rely on touch to navigate and develop tendrils that coil around objects they encounter. Roots also rely on touch to navigate their way through the soil. When roots come into contact with an object, they generally grow in a direction away from the object. Based on this information, which of the following statements is true?
A. The tendrils are displaying a negative thigmotropic response while the roots are displaying a positive thigmotropic response. B. The tendrils are displaying a thigmotropic response while the roots are displaying a thigmonastic response. C. The tendrils are displaying a positive thigmotropic response while the roots are displaying a negative thigmotropic response. D. Both tendrils and roots are displaying thigmonastic responses to an object in the environment. E. The tendrils are displaying a thigmonastic response while the roots are displaying a thigmotropic response.