Which of the following is NOT true of a transmission electron microscope (TEM)?
A. The electron beam is focused with electromagnets.
B. The specimen must be fixed in plastic.
C. The limit of resolution is about 0.1?m.
D. Electrons are passed through the specimen.
E. Gives the clearest three-dimensional images.
E
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Susie has hyperthyroidism. How might this affect ATP production during exercise?
What will be an ideal response?
The concentration of oxygen in the atmosphere is currently 21 percent, but it has been both higher and lower during the Phanerozoic
At the start of the Permian it reached a maximum of 30 percent to 32 percent and then declined throughout the Permian and Triassic, reaching its minimum of 13 percent to 15 percent at the end of the Triassic. Dinosaurs and mammals both appeared in the Triassic, but dinosaurs flourished and radiated into a variety of large-bodied lineages, whereas mammals remained small and did not radiate into multiple lineages. Recall the characteristics of the respiratory systems of sauropsids and synapsids described in Chapter 11 to explain how the low concentration of atmospheric oxygen in the Permian may have favored the development of dinosaurs over mammals.
thyroxine cannot produced without
What will be an ideal response?
The limbic system involves various neural connections between ________.
A. the diencephalon and midbrain B. the pons and cerebellum C. the cerebrum and diencephalon D. the cerebrum and midbrain E. the medulla and pons