Assume that red plants crossed with white plants give rise to pink plants. Explain how to eliminate red
plants if you start with two pinks. What will be an ideal response?
Cross until you get white and use white in crosses until you cross two whites, then all subsequent
plants will be white.
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You need to determine if a pure culture of bacteria is gram-positive or gram-negative, but you've just spilled your only solution of crystal violet so you can't do a Gram stain. You decide to try a lysozyme treatment on a sample of each culture and then examine the samples under the microscope. The expected result is
A. gram-positives will lyse and appears as debris; gram-negatives will lose cellular morphology and appear as cocci. B. gram-negatives will lyse and appears as debris; gram-positives will be unaffected. C. gram-negatives will lyse and appears as debris; gram-positives will lose cellular morphology and appear as cocci. D. gram-positives will lyse and appears as debris; gram-negatives will lyse but more slowly. E. gram-positives will lyse and appears as debris; gram-negatives will be unaffected.
What is the item labeled “B” in the accompanying figure?
a. The enzyme b. The substrate c. The active site d. The transition state e. The product
The substance indicated as “B” is a(n)
a. inhibitor. b. activator. c. substrate. d. coenzyme. e. cofactor.
How does the size of a DNA fragment relate to its speed of passage through the agarose gel?
What will be an ideal response?