If a chromosome fragment breaks off and then reattaches to the original chromosome but in the reverse direction, the resulting chromosomal abnormality is called a(n)
A) deletion.
B) inversion.
C) translocation.
D) reciprocal translocation.
Answer: B
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Major extinctions of dinosaurs are associated with large meteor impacts, including the final extinction that wiped them out at the Cretaceous-Tertiary boundary. The particulate matter that would have arisen as a result of impact would have entered the atmosphere and had secondary impacts. Some scientists believe that a fundamental difference between mammals and dinosaurs allowed mammals to survive this event, but doomed the dinosaurs. What may have characterized the last generation of dinosaurs as they went extinct?
A. Lungs clogged with dust. B. Highly skewed sex ratios. C. Hormonal disruptions due to contaminated water. D. Weak eggshells due to radiation. E. Inability to recognize mates due to diminished sunlight. Clarify Question What is the key concept addressed by the question? What type of thinking is required? Gather Content What do you already know about dinosaurs? What other information is related to the question? Choose Answer Given what you now know, what information is most likely to produce the correct answer? Reflect on Process Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
Nuclear membranes re-forms during
a. prophase. b. telophase. c. interphase. d. anaphase. e. metaphase
In aquatic ecosystems, the phosphorous cycle moves through three states: particulate organic phosphorous, dissolved organic phosphates, and ________ phosphates
Fill in the blank(s) with correct word
Which one of the following forms of contraception is the most effective in preventing pregnancy?
A) condom B) rhythm method C) diaphragm D) tubal ligation E) cervical cap