The process of song learning by white-crowned sparrows is similar to the process of territory-holding by African
cichlid fishes because brain cells in both animals can change ____ in response to well-defined social stimuli.
a. only their biochemistry
b. only their structure
c. only their function
d. only their structure and function
e. their biochemistry, structure, and function
ANSWER: d
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A cell biologist examines a skin cell from a lizard during metaphase of mitosis and determines that 20 chromatids are present. The role of meiosis in this species is to (Check all that apply)
_____ Produce 4 daughter cells that are genetically different from each other. _____ Produce 4 daughter cells that are genetically different from the original parental cell. _____ Reduce the number of chromosomes per cell from 10 to 5. _____ Reduce the number of chromosomes per cell from 20 to 10. 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 meiosis? 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?
What happens to the population size when the birth rate is much larger than the death rate?
a. It remains at an equilibrium. b. It grows to K very quickly. c. It grows to K, but very slowly. d. The population declines.
Most triploid zygotes arise from
A. fertilization of a diploid egg by a normal haploid sperm. B. fertilization of a normal haploid egg by a diploid sperm. C. fertilization of a normal haploid egg by two sperm. D. nondisjunction during the zygote's first mitotic division. E. fusion of the zygote with an unfertilized egg.
Organic molecules _______.
a) always contain carbon and hydrogen b) always contain hydrogen c) always contain carbon d) are always food molecules e) are found only in organisms, hence their name