Which pairing between evolutionary evidence and a biological discipline is NOT correct?
a. pesticide resistance: historical biogeography
b. forelimbs of all four legged vertebrates are homologous: comparative morphology
c. short tails of African and Asian monkeys: historical biogeography
d. gill pouches in embryos of four-limbed vertebrates: comparative embryology
e. species on islands often resemble species on the mainland: historical biogeography
ANSWER: a
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Glucose fermentation by Clostridium spp. produce ATP only when acetate and butyrate are produced. Why do these organisms produce acetone and butanol after strong initial activity of generating ATP with acetate and butyrate byproducts?
A) Acetate and butyrate accumulation creates a deadly acidic environment, which acetone and butanol do not. B) Acetate and butyrate are no longer needed for biosynthetic pathways. C) Acetone and butanol serve as better sources for NAD(P)+ reduction. D) Acetone and butanol production is favored for stability to store intracellular carbon sources for potential nutrient poor conditions.
The key chemical messenger responsible for increasing cardiac output when animals are exercising or under certain stresses is
A. epinephrine. B. acetylcholine. C. dopamine. D. serotonin. E. glutamate.
Which statement about secondary growth in plants is correct? Select all that apply.A) Secondary growth in plants is a result of lateral meristems. Trees and shrubs have active lateral meristems.B) Secondary growth in plants increases the girth (diameter) of woody plants.C) Secondary growth in woody plants results from two cylinders of actively dividing cells, the cork cambium and vascular cambium.D) The cork cambium produces secondary phloem while the vascular cambium produces secondary xylem.E) Only some plants have secondary growth.
What will be an ideal response?
Which type of fish is likely to produce the smallest number of progeny from each mating?
A. An ovoviparous species B. An oviparous species C. A viviparous species