Certified Manager Of Animal Resources (CMAR) AR Practice Exam

Xenopus ova foreign DNA expression.

Reject Express Degrade Bind

Correct Answer:

Express

Explanation:

The main idea is that Xenopus ova can transcribe and translate injected foreign DNA, turning it into RNA and then protein. The oocyte’s transcriptional and translational machinery is highly active, so if the foreign DNA includes a promoter that the oocyte’s RNA polymerase II recognizes, it will be transcribed into mRNA and then translated into a detectable protein. That’s why expressing the foreign DNA is the expected outcome. So, the best answer is “Express,” because the goal is to see the exogenous gene produce RNA and protein inside the egg. While DNA can occasionally be degraded or the DNA might bind to cellular components without producing protein, the scenario described focuses on the ability of the oocyte to express the introduced genetic material.

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