The portion of the flower containing pollen grains is
(a) the pollen sac.
(b) the microsporangium.
(c) the anther.
(d) all of the above.
(d) all of the above.
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Using the figure above and the accompanying paragraph, and knowing that the PKG encoded by the foraging gene has recently been associated with the maturation of out-of-nest behavior in honeybees, what would be a logical explanation for this relationship?
As animals mature, they _____. A) require more food; therefore, PKG levels must increase. B) are more likely to forage; therefore, PKG levels must increase. C) respond to pheromones from the queen, which increases PKG levels. D) are able to fly, an activity that is connected to the increase in PKG levels.
When all the wavelengths of light are
combined, it becomes
a. white. b. black. c. invisible. d. all the colors of the rainbow. e. thicker.
Guard cells
a. surround the stoma. b. control the flow of gases between the interior of a leaf and the atmosphere. c. become turgid when it becomes light if environmental conditions are not too hot or too dry. d. may absorb water from surrounding epidermal cells. e. do all of these.
Which of the following is true concerning a morphological phylogenetic tree with 15 characters and 23 changes, and a molecular phylogenetic tree with 150 characters and 345 changes that contain the same taxa?
A. The molecular tree is a better estimate of the true relationships of the taxa. B. The molecular tree is the true representation of the relationships between the taxa. C. The morphological tree is the better estimate of the true relationships between the taxa because it has a shorter length. D. The morphological tree is the true representation of the relationships between taxa as it has the shorter length.