In the flower diagram shown above, the item labeled "8" is a(n)
a. ovule.
b. stigma.
c. sepal.
d. anther.
e. style.
A
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A cyclin _____
A) is present in similar concentrations throughout the cell cycle B) is activated by binding to microtubules C) decreases in concentration when MPF activity increases D) activates a Cdk molecule when it is in sufficient concentration E) activates a Cdk when its concentration is decreased
Which of the following premises forms the basis of the concept of molecular evolution?
A) The molecules of life all evolved in the same approximate time span. B) Species that have very similar DNA sequences probably share recent ancestors. C) Species coevolved similar DNA sequences by chance. D) All genes have the same mutation rate.
Many species of ants "farm" aphids, protecting them from predation and collecting concentrated sugars (i.e. honeydew) from them. This type of ant/aphid relationship is known as
A. dispersive mutualism. B. parasitism. C. trophic mutualism. D. commensalism. E. defensive mutualism.
In a plant bending toward light, you would expect ________ to have increased in activity.
A. gibberellins. B. expansins. C. cytokinins. D. ethylene.