_____ occurs when a cloned gene recombines with the normal gene on a chromosome to create a genetically modified organism (GMO).
A. Gene replacement.
B. Gene knockout.
C. Transfection.
D. Transformation.
E. Infection.
A. Gene replacement.
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The nucleus of a differentiated cell contains all of the genetic information necessary to direct the development of an entire organism. This nucleus is therefore said to be ________.
Fill in the blank(s) with the appropriate word(s).
Thermodynamics tells us that efficiency in reactions is important and determined by how much energy is lost to heat in a reaction. In the metabolism of glucose, what percentage of the energy is extracted?
a. 50 percent b. 100 percent c. 34 percent d. less than 10 percent
Were there any eukaryotic cells on Earth 1.5 billion years ago?
A) Yes, they first appear in the fossil record around 3.5 billion years ago. B) Yes, they first appear in the fossil record around 2 billion years ago. C) No, they do not appear in the fossil record until around 1 million years ago. D) No, they do not appear in the fossil record until around 500 million years ago.
Oxygen is transported through the body mostly ________
A) dissolved in the blood B) dissolved in red blood cells C) bound to hemoglobin D) bound to dissolved iron