Which microscope is most useful for visualizing a biofilm?
A) compound light microscope
B) phase-contrast microscope
C) fluorescence microscope
D) scanning acoustic microscope
E) transmission electron microscope
D
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The chemiosmotic model of ATP synthesis is based on several lines of experimental evidence. Which of the following statements is not correct experimental evidence to support the chemiosmotic model?
A) Artificial proton gradients established by addition of acid can drive ATP synthesis in the absence of electron transport. B) Oxidative phosphorylation does not require a membrane-enclosed compartment. C) Electron transport causes protons to be pumped out of the mitochondrial matrix. D) The proton gradient established by electron transport has enough energy to drive ATP synthesis. E) Uncoupling agents abolish both the proton gradient and ATP synthesis.
Anti-A and anti-B antibodies
A. are considered natural antibodies. B. are present at birth. C. are typically IgM. D. easily cross the placenta. E. are considered natural antibodies AND are typically IgM.
Tallness (T) is dominant to dwarfness (t), while red (R) flower color is dominant to white (r). The heterozygous condition results in pink (Rr) flower color. A dwarf, red snapdragon is crossed with a plant homozygous for tallness and white flowers. What are the genotype and phenotype of the F1 individuals?
A) ttRr-dwarf and pink B) ttrr-dwarf and white C) TtRr-tall and red D) TtRr-tall and pink E) TTRR-tall and red
The large number of alveoli in mammalian lungs, the numerous lamellae in fish gills, the papulae of echinoderms, and the extensive tracheal system of insects are all adaptations that optimize what factor in the formula for Fick's law of diffusion?
A. A B. d C. ?p D. D