Which step in the evolution of life is the most
complex and probably occurred last?
a. formation of DNA
b. formation of protein-RNA systems
c. formation of membrane-bound proto-cells
d. spontaneous formation of organic
compounds under abiotic conditions
e. formation of ATP
C
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Infants acquire natural passive immunity from maternal antibodies transferred across the placenta or in breast milk
Indicate whether the statement is true or false.
Which of the following represents a monophyletic group?
A. mosses, liverworts, and hornworts B. ferns and club mosses C. ferns, whisk ferns, and horsetails D. liverworts and hornworts E. Charophytes and mosses 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 phylogeny? 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?
The embryonic shoot tip is indicated by the letter ____
a. A b. B c. C d. D e. E
The drug that can cause aplastic anemia, and is used to treat typhoid fever and brain abscesses is
A. chloramphenicol. B. clindamycin. C. gentamicin. D. ciprofloxacin. E. bacitracin.