For which of the following is the biological species concept least appropriate?
a. Plants
b. Animals
c. Both prokaryotes and fossils
d. Prokaryotes
e. Fossils
Answer: c. Both prokaryotes and fossils
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What technical advance allowed Walther Flemming and other scientists of his generation to better understand the stages of mitosis and meiosis?
A. the ability to obtain single cells B. the ability to slice cells thinly C. microscopes with two eyepieces D. microscopes with high-quality oil immersion lens E. electron microscopes
A dental student wants to test if fluoride is an effective additive against tooth decay. The student studies tooth decay in a population of people who live in neighborhoods supplied with fluoridated water. This student would like to ask whether access to fluoridated water prevents tooth decay. What would be an effective control group to ask this question?
A. Individuals who have fluoride added to their toothpaste but not their water. B. Individuals with access to fluoridated water. C. Individuals with access to water with no fluoride added. D. Individuals with access to differing amounts of fluoride in the water. Clarify Question 1. What is the key concept addressed by the question? 2. What type of thinking is required? 3. What key words does the question contain and what do they mean? Gather Content 1. What do you know about experimental design?How does it relate to the question? Consider Possibilities 1. What other information is related to the question? Which information is most useful? What are other explanations are there for these results? Choose Answer 1.Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer? Reflect on Process 1. 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?
One of the conclusions drawn from Darwin's theory of evolution is that:a
existing organisms can adapt to environmental changes b. living organisms are composed of basic units called cells c. living organisms contain substances produced by cells d. genetic information can pass from organism to organism by means of DNA e. organisms living today descended with modifications from previously existing forms
What is the basis of Mendel's laws?
A) the behavior of chromosomes during prophase I of meiosis only
B) the behavior of chromosomes during mitotic anaphase
C) the behavior of chromosomes during prophase I and prophase II of meiosis
D) the behavior of chromosomes during metaphase I and anaphase I of meiosis