What is photorespiration? Describe how C4 plants have evolved the ability to reduce photorespiration
What will be an ideal response?
Photorespiration occurs when RuBP combines with O2 rather than CO2, so the plant is not allowed to fix carbon and produce glucose. C4 plants use a two-stage carbon-fixation pathway where PEP is used instead of RuBP, which specifically reacts with CO2 and not O2. The CO2 is then shuttled to the bundle sheath cells and creates a high CO2 concentration that favors the regular C3 cycle reactions without competition from O2.
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The mechanism of pathogenesis by prions may involve a conformational change in the prion protein (PrP) to an abnormal form.
Answer the following statement true (T) or false (F)
You place an empty dog-food dish across the room from a puppy that then goes over to investigate the dish. You pick the dish up and ten minutes later you place it in a different part of the room, and you keep repeating this pattern. After the fifth time the puppy no longer goes over to the empty dish. Which of the following terms best describes this form of learning?
A. trial and error learning B. habituation C. classical conditioning D. operant conditioning E. imprinting 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 types of learning behaviors? 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 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?
The great adaptive radiation of hominoids in the
Miocene is attributable to a. the proliferation of complex forests. b. an extended cooling and drying trend. c. the advent of bipedalism. d. the evolution of a large brain. e. changes in tooth structure.
When reduction in population size is severe, it is known as _______.
A. fixed B. founder effect C. adaptive radiation D. bottleneck E. gene flow