In the testcross Aa Bb × aa bb, what proportion of individuals are expected to be homozygous for both genes in the F1 generation?
A) 1/4
B) 1/2
C) 3/4
D) All are homozygotes.
E) None are homozygotes.
A) 1/4
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A graduate student is trying to isolate bacterial mRNA for an enzyme that will degrade trinitrotoluene (TNT)
She's frustrated to find that the enzyme isn't produced when the bacterium in question is grown on nutrient agar. What might she do to solve the problem and obtain the mRNA? A. Add nitrogen and toluene to the agar to drive up synthesis of TNT. B. Add TNT to the agar-this will drive synthesis of the enzyme to degrade it, leading to production of the mRNA the student is looking for. C. Remove glucose from the agar-this will cause the bacteria to shift to other compounds for their energy purposes. D. Remove all sugars from the agar-this will cause the bacteria to shift to other compounds for their energy purposes. E. Add TNT to the agar-this will drive synthesis of the enzyme to degrade it, leading to production of the mRNA the student is looking for AND remove all sugars from the agar-this will cause the bacteria to shift to other compounds for their energy purposes.
People often pick up and "adopt" baby wild animals, which then leads to a set of dependent behaviors that the young animal learns very rapidly. The dependent behaviors will be retained through life, endangering the survivability of the animal around people or in the wild. This behavior is learned by
A. observation. B. imprinting. C. reflex. D. habituation. E. taxis.
______ and nitric oxide coordinate a plant's response to pathogens by closing stomata, thus preventing further entry.
Fill in the blank(s) with the appropriate word(s).
Which of the following statements best compares the two dominant lineages of modern angiosperms?
A. Monocots have only one pistil per flower whereas eudicots have three. B. Monocots are monophyletic whereas eudicots have multiple origins. C. Monocots are lycophylls whereas eudicots are euphylls. D. Monocots have only one cotyledon whereas eudicots have two. E. Monocots have only one stamen per flower whereas eudicots have six.