Many kinds of ascomycetes and basidiomycetes have lost the ability to reproduce sexually.
Answer the following statement true (T) or false (F)
True
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A study finds a positive correlation between the number of spots on the tail of male peacocks and their mating success. What would be the best followup experiment?
A. Count the number of spots on female tails and measure mating success. B. Remove spots or add artificial spots to male tails and determine female responses. C. Measure the sperm count of males and compare to spot count. D. Inject testosterone and observe changes in spot count. 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 sexual selection and planning an experiment? 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? Reflection: 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?
Each of the following is true about homeoviscous adaptation in membranes except
A) maintains membrane viscosity despite changes in environmental temperature. B) may decrease the average length of membrane lipid fatty acid tails. C) may increase the unsaturation of membrane lipid fatty acid tails. D) occurs primarily in homeothermic (warm-blooded) organisms and only rarely in poikilothermic (cold-blooded) organisms. E) may increase the proportion of cholesterol in animal cell membranes.
A mutant E. coli strain, grown under conditions that normally induce the lac operon, does not produce ß-galactosidase. What is a possible genotype of the cells?
A. lacl+ lacP+ lacO+ lacZ+ lacY+ lacA+ B. lacI+ lacP+ lacOc lacZ+ lacY+ lacA+ C. lacI- lacP+ lacO- lacZ+ lacY+ lacA- D. lacI+ lacP- lacO+ lacZ+ lacY+ lacA+ E. lacI+ lacP+ lacO+ lacZ+ lacY- lacA+
All of the following are found in the Gram-Negative Bacteria cell EXCEPT
A. Lipid A B. Periplasmic space C. Peptidoglycan D. Teichoic acid E. Lipopolysaccharide