Robert Hooke first used the term cell in 1665. However, nearly 200 years passed before scientists developed the cell theory. Why did it take so long between the first use of the term cell and the development of the cell theory?
A) The development of the cell theory depended on scientists first developing the germ theory of disease.
B) Scientists were more interested in studying the relationship of organisms to their environment rather than their structure.
C) Microscopes were not available for scientists to study the cellular structure of organisms.
D) Scientists had to make many observations of various organisms before they could establish a theory.
Ans: D) Scientists had to make many observations of various organisms before they could establish a theory.
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Margarine is made by hydrogenating vegetable oils so that they take on the consistency of butter. Propose a chemical basis for this change from a liquid to a solid.
A. Hydrogenation of fats changes them from saturated to unsaturated, which are more solid. B. Trans-fatty acids are changed from unsaturated to saturated, allowing them to solidify. C. Trans fatty acids are changed from saturated to unsaturated, allowing them to solidify. D. Hydrogenation of fats changes them from unsaturated to saturated, which are more solid. 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 the effect of saturation on the consistency of a fat? 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?
External fertilization is most commonly seen
a. in land animals. b. in plants. c. in aquatic animals. d. during dry seasons. e. among all animals.
____ is a particularly dangerous strain of a
residential bacteria because it doesn't respond to antibiotic treatment.
a. C. tetani b. MRSA (methicillin resistant S. aureus) c. C. diphtheria d. E. coli e. H. pylori
DDT was once considered a "silver bullet" that would permanently eradicate insect pests. Instead, DDT is largely useless against many insects. Which of these would have prevented this evolution of DDT resistance in insect pests?
A) All habitats should have received applications of DDT at about the same time. B) The frequency of DDT application should have been higher. C) None of the insect pests would have genetic variations that resulted in DDT resistance. D) DDT application should have been continual.