The mitotic stage during which chromosomes begin attaching to spindle fibers and moving randomly and reversibly to the centrosomes is
A) prophase.
B) prometaphase.
C) metaphase.
D) anaphase.
E) telophase.
B) prometaphase.
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Birds and insects both have wings, but we do not consider this similarity as evidence of relatedness because
A. they did not evolve in the same region or live at the same time period. B. the wings are not homologous structures with a common ancestral origin. C. bird wings, but not insect wings, function on the physics principles of lift. D. there is no fossil link between these groups. E. insect wings are vestigial.
A radula is characteristic of certain members of phylum Platyhelminthes
____________________ Indicate whether the statement is true or false.
Which of the following best reflects the concept of fetal programming?
a. A woman smokes and binge drinks during her pregnancy, and experiences a miscarriage in the first trimester. b. A woman experiences a hurricane while pregnant, and the child's genes are marked to be highly sensitive to stress. c. An active fetus creates distress for a woman while pregnant, which leads her to be less attached to child in infancy. d. A doctor selects the most genetically healthy embryos to implant in a woman's uterus following in vitro fertilization.
After an oil spill, bacteria that can metabolize hydrocarbons are released for bioremediation. After a month, two areas affected by the spill show different levels of improvement. Which factor should be measured to determine the difference in effectiveness between the two sites?
A. Nutrient levels B. pH C. Salinity D. Oxygen levels E. Temperature F. All of these factors may play a role.