To retrieve a sample from a culture tube with an inoculating loop, the cap of the tube is
What will be an ideal response?
removed with the fingers of the loop hand and placed in the fingers of the tube hand
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Which of the following correctly describes the fate of the embryonic germ layers?
A. The endoderm forms the gut, the ectoderm forms the epidermis and parts of the nervous system, and the mesoderm forms muscles and most internal organs. B. The endoderm forms the gut, the ectoderm forms the reproductive tract and endocrine system, and the mesoderm forms muscles and most internal organs. C. The endoderm forms the inner part of all internal organs, the mesoderm forms the middle parts, and the ectoderm forms the outer coverings. D. The layers are sequential structures that all disappear during development, with the endoderm appearing first and then is replaced by the mesoderm, which in turn is supplanted by the ectoderm. E. The endoderm is an embryonic structure that disappears early, whereas the ectoderm persists as the skin and the mesoderm as the internal organs.
What is the pH of a solution when the number of H+ ions equals the number of OH– ions in the liquid?
a. 0-2 b. 3-6 c. 7 d. 8-10 e. 11-14
Extracellular fluid includes
a. interstitial fluid. b. plasma. c. intracellular fluid. d. both a and b.
The flow of genetic information in a cell goes from __________.
a. DNA to RNA to glucose b. Protein to RNA to DNA c. DNA to lipid to protein d. DNA to RNA to protein