Three scientists are using different forms of PCR for their research. Abby wants to determine changes in gene expression levels in a tissue, so she uses ________. Bob is trying to extract genetic information from a wooly mammoth fossil, so he uses ________. Chris needs to express a gene in bacteria that matches the form expressed in kidney cells, so she uses ________.
A. quantitative RT-PCR; PCR; RT-PCR
B. RT-PCR; quantitative RT-PCR; PCR
C. RT-PCR; PCR; quantitative RT-PCR
D. quantitative RT-PCR; RT-PCR; PCR
E. PCR; quantitative RT-PCR; RT-PCR
Answer: A
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The cofactors required for enzyme activity often are
a. allosteric inhibitors. b. allosteric activators. c. charged amino acids. d. large, complex organic molecules. e. competitive inhibitors.
X chromosome inactivation occurs when the embryo is a ball of about ________ cells
a. 36 b. 12 c. 200 d. 25 e. 2,000
Which of the following statements is true?
a. The left and right portions of this life cycle illustrate asexual and sexual reproduction, respectively. b. The left and right portions of this life cycle illustrate sexual and asexual reproduction, respectively. c. Both portions of this life cycle illustrate asexual reproduction, because this organism does not reproduce sexually. d. Both portions of this life cycle illustrate sexual reproduction, because this organism does not reproduce asexually. e. Meiosis occurs in both portions of the life cycle.
Which of the following organisms is photoautotrophic protozoan?
A) oomycote B) cellular slime mold C) Euglena D) Phytophthora E) plasmodial slime mold