Cells pass through regulatory checkpoints as they prepare to divide. If mutations are detected in the cell, normally __________ will initiate cell death.

a. tumor suppressor genes
b. oncogenes
c. proto-oncogenes
d. metastatic cells


Answer: c. proto-oncogenes

Biology & Microbiology

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Which is a filamentous phage?

A. M13. B. T4. C. Lambda. D. TMV.

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Which of the following images represents the expected results of a DNA gel for three individuals with different genotypes-homozygous dominant (lane 1), heterozygote (lane 2), and homozygous recessive (lane 3)?

What will be an ideal response?

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Retrotransposons _____

A) use an RNA molecule as an intermediate in transposition B) are found only in animal cells C) generally move by a cut-and-paste mechanism D) contribute a significant portion of the genetic variability seen within a population of gametes

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