Which of the following chemicals is a signal that induces systemic acquired resistance?
A. salicylic acid
B. brassinosteroids
C. systemin
D. avr
E. nitric acid
A. salicylic acid
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Cooksonia is a genus of very early tracheophyte plants. Unlike modern tracheophytes they only grew to a few centimeters in height. What feature provides the best explanation for their diminutive size?
A. They completely lacked vascular tissues. B. They did not have stomata. C. They consisted of only photosynthetic stems, not roots or leaves. D. Cooksonia species were not autotrophic. 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 Cooksonia? 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?
Ebola virus can be transmitted via
A) fruit fallen from a tree. B) direct contact with bodily fluids of an infected person. C) agriculture/crops in an epidemic area. D) any contact, like a handshake.
The principle of nuclear equivalence states that:a
developing cells become specialized to carry out specific functions. b. developing cells follow particular differentiation pathways. c. there is no loss of genetic information through determination or differentiation. d. differential gene expression is responsible for variation among cells. e. nuclear changes can take place during the entire life of an individual.
Paleontologists are scientists who study the fossil record. They can use the fossil record to identify a common ancestor. What is a common ancestor?
A) species that became extinct as the environment changed B) species that left a complete history of its existence in the fossil record C) species from which two or more species evolved D) species that suddenly appears in the fossil record and then just as quickly disappears