Which of the following reflects a primary difference between transmission and scanning electron microscopy?
A. Transmission electron microscopy has high resolution, but scanning electron microscopy does not.
B. Transmission electron microscopy shows contrast, but scanning electron microscopy does not.
C. Transmission electron microscopy has much higher magnification than scanning electron microscopy.
D. Transmission electron microscopy shows two-dimensional ultrastructure, while the scanning electron microscopy shows three-dimensional structure.
E. Transmission electron microscopy uses light as an illumination source, while scanning electron microscopy uses electron beams as an illumination source.
D. Transmission electron microscopy shows two-dimensional ultrastructure, while the scanning electron microscopy shows three-dimensional structure.
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Most cases of viral gastroenteritis are accompanied by high fevers.
Answer the following statement true (T) or false (F)
Explain the importance of information transfer in living systems, and include three specific examples. What will be an ideal response?
What type of speciation is most common in animals?
a. hybridization b. allopatric c. allopolyploidy d. sympatric e. paedomorphosis
Which of the following problems with animal cloning might result in premature death of the clones?
A) use of pluripotent instead of totipotent stem cells B) use of nuclear DNA as well as mtDNA C) abnormal gene regulation due to variant methylation D) the indefinite replication of totipotent stem cells