A bacterial cell that is bio- met- leu+ thr- thi+ is infected by a virus carrying bacterial DNA containing bio+ met+
leu- thr- thi+. If all five genes from the virally transduced DNA are recombined into the recipient cell, what kinds of
nutrients will the resulting cell still require from the medium in order to grow? Explain your answer.
What will be an ideal response?
ANSWER: If all five of the transduced genes recombine into the recipient DNA, the resulting cell will be
bio+ met+ leu+ thr- thi+. This means the cell will not be able to make its own leucine and
will require this nutrient in the medium.
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Imagine a planet that has a similar atmospheric pressure to Earth (760 mmHg), but different concentrations of gases in its atmosphere
On this hypothetical planet, oxygen makes up 10% of the atmosphere, nitrogen makes up 15%, and carbon dioxide makes up the remaining 75%. Based on this information, what is the partial pressure of oxygen on this new planet? A. 76 mmHg B. 114 mmHg C. 160 mmHg D. 571 mmHg E. 646 mmHg
Use of cytokinins has had wide application in the horticultural industry because cytokinins are used in:
A. tissue cultures B. fruit production C. stem elongation D. flower maturation E. root development
Which of the following is not an intermediate filament protein?
a. Vimentin b. Nestin c. Lamin A d. Fibronectin e. Desmin
Nonspecific chemical defenses of the human host include all of the following EXCEPT ______.
A. lactic acid B. lysozyme C. antibodies D. hydrochloric acid