In transmission electron microscopy, spreading a specimen out in a thin film with uranyl acetate, which does not penetrate the specimen, is called ________.

A. shadow staining
B. freeze-etching
C. negative staining
D. simple staining


Answer: C

Biology & Microbiology

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The organelle involved in the oxygen-requiring process by which the energy harvested from macromolecules is used to generate ATP is the:  

A.  chloroplasts. B.  ER. C.  nucleus. D.  lysosome. E.  mitochondria.

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All gametes contain :

a. two chromosomes. b. two identical sets of chromosomes. c. two different sets of chromosomes. d. one chromosome. e. one set of chromosomes.

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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

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____ is not one of the phases of vertebral column development

Fill in the blank(s) with the appropriate word(s).

Biology & Microbiology