Describe how yeast differs from bacteria, and describe the roles of yeast in at least two important biotechnology applications
What will be an ideal response?
Bacteria cells are simple, inexpensive to grow, and grow quickly. So, they are the cells
of choice for protein expression, where possible. The problem is that bacteria do not correctly
fold proteins or perform other posttranslational modifications. Yeast cells are a good alternative
to bacterial cells because they are still relatively simple and inexpensive to grow, but they have
the ability to fold proteins correctly and perform many posttranslational modifications. So, yeast
cells are good for biotechnology because they are inexpensive, easy to grow, and perform
posttranslational modifications and correct protein folding.
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The results of the butterfly experiment
a. supported the hypothesis. b. provided valuable quantitative data. c. confirmed the prediction. d. provided evidence of natural selection in action. e. are consistent with all of these
Enzymes
a. are not specific. b. act as catalysts. c. are inorganic molecules. d. have special shapes that react to their activities. e. are cholesterol derivatives.
Which line, A, B, C, or D, points to tracheids and vessels in xylem?
1.A
2.B
3.C
4.D
Another planetary body that astrobiologists list as a
top priority for exploration to search for life is a. Pluto. b. Venus. c. the moon around earth. d. Europa, a moon around Jupiter. e. none of these. Answer: d