Which of the following important figures performed an experiment that helped debunk spontaneous generation?
A. Louis Pasteur
B. Robert Hooke
C. Robert Koch
D. Antonie van Leeuwenhoek
Ans: A. Louis Pasteur
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You are examining the effect of maturation-promoting factor (MPF) in sea urchin cells, which have a diploid number of 36. If you fuse a dividing sea urchin cell with a G1 arrested oocyte, what would be the outcome?
A. The G1 cell would enter mitosis, but would likely arrest at the spindle checkpoint because the chromosomes have not been properly replicated. B. The G1 cell would undergo mitosis and its daughter cells would each have 36 chromosomes. C. The G1 cell would undergo mitosis and its daughter cells would each have 18 chromosomes. D. The G1 cell would first go through S phase and then mitosis. Its daughter cells would have 36 chromosomes. Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? · What key words does the question contain and what do they mean? Gather Content · What do you know about MPF? How does it relate to the question? Consider Possibilities · What other information is related to the question? Which information is most useful? Choose Answer · Given what you now know, what information and/or problem solving approach 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?
The capsule at the top of the moss sporophyte that produces spores is called the:
A. sporangium. B. splash cup. C. prothalus. D. gametophyte. E. gamete.
Which of the following enzymes converts chemical bond energy to light energy in bioluminescent organisms?
a. oxyluciferin b. luciferase c. pepsin d. luciferin
Molecular evidence from ________ indicates that Homo sapiens were present the longest in Africa.
Fill in the blank(s) with the appropriate word(s).