Two pairs of electrons shared between two atoms is called a __________. Fill in the blank(s) with the appropriate word(s)
ANS: double bond PTS: 1 DIF: Moderate
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Using the NeoR/Tk system of introducing gene replacements into mice (as described in the text), which of the following would identify those mouse cells that were the result of homologous recombination?
A. NeoR only B. Tk only C. NeoR and Tk D. Neither NeoR or Tk
Cholesterol ____
a. has a rigid backbone of four nitrogen rings b. is the most common steroid in animal tissue c. is a lipid with a fatty-acid component d. is needed to inhibit sexual development and maturity e. is needed to lubricate feathers
The movement of sugars and other organic molecules through phloem is called __________. Fill in the blank(s) with the appropriate word(s)
Heritable units of information about traits are called __________. Fill in the blank(s) with the appropriate word(s)