As you look through the microscope, you observe a liver cell just beginning to enter mitosis. Identify the steps of mitosis that are listed in correct order.
A. prophase,
B. metaphase,
C. anaphase,
D. telophase
E. all of the above
Ans: E. all of the above
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What is required if a researcher wants to analyze homologous genes in different species?
A. relatively short DNA sequences B. relatively short RNA sequences C. relatively long DNA sequences D. relatively short polypeptide sequences E. relative differences in the species’ metabolisms.
Genetic testing performed on cells of the placenta is called ____, while a similar procedure that uses cells derived from the amniotic fluid is called ____
a. placenta sampling; chorionic villus sampling b. trophoblast testing; amniocentesis c. trophoblast testing; chorionic villus sampling d. chorionic villus sampling; amniocentesis e. placenta sampling; amniocentesis
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.
The basal body is comprised of which structural component(s) of flagella?
a. Rod b. Filament c. Rod and Rings d. Rings e. Rod and Hook f. Hook