Cilia and flagella bend because of _____
A) conformational changes in ATP that thrust microtubules laterally
B) a motor protein called radial spokes
C) the quick inward movements of water by osmosis.
D) a motor protein called dynein
Answer: D
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You are working with a specific enzyme-catalyzed reaction in the lab. You are a very careful experimentalist, and as a result, at the beginning of each of your experiments, you measure the temperature in the lab. On days 1 through 5, the temperature in the lab was 20oC. Today is day 6 of your experiment, and the temperature in the lab is 30oC. How do you predict that this will alter the rate of your enzyme-catalyzed reaction?
A. It will decrease the rate B. It will increase the rate C. It could possibly increase or decrease the rate D. it will not affect the rate Clarify Question What is the key concept addressed by the question? Gather Content What do you already know about enzyme rates and temperature? What other information is related to the question? Choose Answer Do you have all necessary information to make a judgment? 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?
You're a famous eye surgeon, specializing in corneal transplants. Give your choice, would you rather have a cornea for transplantation from a 20 year old individual, or a 60 year old individual (assuming there are no optical defects due to age), and why?
A. The 60 year old-clearly, if the individual has gone 60 years with no optical defects, this is a very good organ for transplantation. The 20 year old cornea may have defects that simply haven't become apparent yet. B. The 20 year old cornea-younger is always better when dealing with tissue transplants. You want to give the transplant the longest possible time for survival in the recipient. C. The 20 year old cornea-while extremely rare, it may be possible to transmit prions through corneal transplants. It's less likely that a 20 year old would have encountered and become contaminated by prions than the 60 year old. D. The 20 year old cornea-never mind prions, there are a variety of agents that can hide in corneal tissues and that might cause disease. It's far more likely that the 60 year old would be harboring one or more of these pathogens than the 20 year old.
Preventing _____ions from leaking into the cell will block the action potential
a. potassium b. sodium c. calcium d. chloride e. ammonium
A population of dandelions in a field exemplifies a ____ population distribution.
A. clumped B. random C. uniform D. constant E. homogeneous