A mutant of Rhizobium leguminosarum is able to survive and reproduce in the laboratory outside of plant roots, but can no longer initiate root nodule formation. What type of genes are most likely mutated in this mutant?
A) rhz genes
B) myc genes
C) nif genes
D) nod genes
Answer: D
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The half-life of carbon-14 is 5,600 years. A fossil that has one-eighth the normal proportion of carbon-14 to carbon-12 is probably
A. 2,800 years old. B. 5,600 years old. C. 11,200 years old. D. 16,800 years old. E. 22,400 years old. 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 half-lives of radioactive isotopes? 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?
Photosynthetic organisms using the oxygenreleasing
pathway appeared on earth about ____ billion years ago.
a. 1.3 b. 1.8 c. 2.3 d. 2.7 e. 3.8
In the thylakoid membranes, the pigment molecules in a light-harvesting complex _____
A) split water and release oxygen from the reaction-center chlorophyll B) absorb and transfer light energy to the reaction-center chlorophyll C) synthesize ATP from ADP and i D) transfer electrons to ferredoxin and then NADPH
Which form of speciation is most rapid?
A. sympatric speciation via polyploidy B. sympatric speciation via disruptive selection C. allopatric speciation on the mainland D. sympatric speciation via character displacement E. allopatric speciation on island archipelagos