Which of the following are living cells?
a. tracheids
b. cork
c. sclereids
d. parenchyma
e. vessel members
Answer: d
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When scientists inserted the Bt toxin gene into plant cells they created a
A. transgenic plant. B. stem cell. C. new species. D. clone. E. monohybrid.
Which of the following transposable elements are found in eukaryotes but not in prokaryotes?
A) IS elements B) Families of autonomous and nonautonomous elements C) Retrotransposons D) Ty elements E) B, C, and D only
The cell theory states that the cell is the basic unit of structure for all organisms. What smaller structure would make up the cells of all organisms?
A) cell wall B) chloroplast C) nucleus D) cell membrane
A scientist hypothesizes that a new drug turns on a certain gene in a skin cell. Which of the following experiments would be the best to test her hypothesis?
A) Use qPCR to measure the initial levels of gene expression in skin cells, treat skin cells with the drug and measure the levels of gene expression, and then compare the two measurements. B) Use qPCR to measure the levels of gene expression in skin cells after exposure to the drug. C) Use qPCR to measure the initial levels of gene expression in muscle cells, treat skin cells with the drug and measure the levels of gene expression, and then compare the two measurements. D) Use qPCR to measure the levels of gene expression in skin cells after exposure to the drug and then add another drug to turn off gene expression and use qPCR to measure the levels of expression.