Which of the following defines an inactive viral segment of nucleic acid inserted into a bacterial chromosome during a lysogenic cycle?
a. retro virus
b. prophage
c. temperate phage
d. transduction
Answer: a. retro virus
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One example of an innovation from an unexpected source comes from studies of tumor-like plant growths. What information did the study of plant tumors provide that was critical for plant genetic engineering?
A) understanding the role of plant hormones in growth promotion B) knowledge of plant tumor suppressor and proto-oncogenes C) learning that metastasis is critical for tumor progression D) learning the biosynthetic pathway to ?-carotene E) discovery of a plasmid that could be modified to introduce genes into plants
The statement, "Energy is neither created nor destroyed," describes
A) the first law of thermodynamics. B) the second law of thermodynamics. C) the law of conservation of energy. D) enthalpy. E) both choices A and C
Each carbon atom can share pairs of electrons with as many as ________ other atom(s)
Fill in the blank(s) with correct word
Which of the following statements is NOT
true? a. All isotopes of an element have the same number of electrons. b. All isotopes of an element have the same number of protons. c. All isotopes of an element have the same number of neutrons. d. We refer to isotopes by mass number. e. 12C and 13C are isotopes