Cottonwood, aspen, and willow trees have beige flowers, with no petals, that appear before the tree's leaves are out in the spring; and they are dioecious. What does this indicate about these trees?
A) Their insect pollinators are specialists.
B) Early emerging insects are probably the pollinators.
C) Their pollen is dispersed by wind.
D) The trees are self-pollinating.
C
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In the absence of oxygen, can cells utilize the electron transport chain?
A. Yes, all cells can make use of the electron transport chain in the absence of oxygen via fermentation. B. No, oxygen is a required cofactor for the complexes in the electron transport chain. C. Yes, in the case that a cell can use a terminal electron acceptor other than oxygen, it can make use of the electron transport chain. D. No, oxygen is the primary electron acceptor in electron transport chains in all cell types.
During which of the following time periods does a CAM plant use rubisco?
a. daylight only b. in darkness only c. noon to midnight d. midnight to noon e. all 24 hours of a standard calendar day
The ecological footprint of cities can be reduced by _____________.
A. using more fertilizers on lawns and public parks B. planting rooftop gardens C. tax incentives to encourage investment in renewable energies D. composting food waste and growing food in community gardens E. B, C, and D are all correct.
Which of the following features is a shared derived trait of the animals?
A. Cells that contain chitin B. Vascular systems C. Similarities in their Hox genes D. Bilateral symmetry E. Spiral cleavage