Which of the following is a symbiotic relationship between club fungi and tree roots in which the fungal hyphae wrap around, but do not penetrate, the plant cells?
a) lichens
b) ectomycorrhiza
c) arbuscular ectomycorrhiza
d) algal rhizoids
e) algorhiza
Answer: b) ectomycorrhiza
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This organism, belonging to the family Enterobacteriaceae, grows best at 25°C to 30°C. Domestic and wild rats and other animals can carry this organism. What is the medium of choice?
a. MacConkey agar b. Xylose-lysine-deoxycholate (XLD) agar c. Cefsulodin-irgasan-novobiocin (CIN) agar d. Hektoen enteric (HE) agar
The Gram-negative opportunistic rod that can grow in a wide variety of environments, including disinfectants and soaps, is
A. E. coli. B. S. aureus. C. S. pyogenes. D. P. aeruginosa.
You decide to do an experiment with isolated myofibrils to explore the effects of ATP hydrolysis on myofibril function. You do this by bathing the myofibrils in a solution that contains a modified form of ATP, which cannot be split into ADP and Pi. At what step will myofibril function be arrested by using this compound instead of unmodified ATP?
A. Myosin heads will be unable to bind to the actin filaments. B. There will be no block in the cycle, since ATP hydrolysis is not required for this process. C. The myosin heads will remain attached to the actin filaments after the power stroke. D. Myosin heads will bind to the actin filaments, but the power stroke will not occur and actin filaments will not slide over the myosin filaments. E. Myosin molecules will be unable to assemble into thick filaments. Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? Gather Content · What do you know about the role of ATP hydrolysis in myofibril function? 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? 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?
Some krill appear to have an additional purpose for molting. What is this alternate purpose? a. As a defense mechanism
b. To produce bioluminescence in the water. c. To feed larger organisms in the food chain. d. To attract attention of mates.