Claytonia virginica is a woodland spring herb with flowers that vary from white to pale pink to bright pink. Slugs prefer to eat pink-flowering over white-flowering plants (due to chemical differences between the two), and plants experiencing severe
herbivory are more likely to die. The bees that pollinate this plant also prefer pink to white flowers, so that Claytonia with pink flowers have greater relative fruit set than Claytonia with white flowers. A researcher observes that the percentage of different flower colors remains stable in the study population from year to year. Given no other information, if the researcher removes all slugs from the study population, what do you expect to happen to the distribution of flower colors in the population over time?
A) The percentage of pink flowers should increase over time.
B) The percentage of white flowers should increase over time.
C) The distribution of flower colors should not change.
D) The distribution of flower colors should randomly fluctuate over time.
Answer: A
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If you exposed a C4 plant to 14CO2 in the light, which would be the first organic molecule labeled with 14C?
A. oxaloacetate B. malate C. pyruvate D. phosphoenolpyruvate (PEP) 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 how carbon fixation in C3, C4, and CAM plants? How does photosynthesis differ in these plants? What other information is related to the question? Choose Answer Do you have all necessary information to determine which organic molecule would be first to be labeled with 14C in a C4 plant? 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?
Adaptations that have enabled vertebrates to survive on land include all of the following EXCEPT
A. a water-resistant epidermis B. development of a bony skeleton C. development of longs D. external fertilization E. embryos enclosed within membranes
The first vertebrates appear in the fossil record during the
A. Cambrian Period. B. Carboniferous Period. C. Triassic Period. D. Devonian Period. E. Proterozoic Era.
Diploid number is ______
Fill in the blank(s) with the appropriate word(s).