Perennials are ________.
A. flowering plants to live for two years
B. flowering plants that live for one year
C. a type of gymnosperms
D. flowering plants that keep on reproducing for many years
Answer: D
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In a continuous culture system, the rate at which media is added and removed is called the ________ rate.
A. dilution B. pass-through C. flow-through D. chemostatic
As part of the previous experiment, you monitor the growth of tree A (ants blocked from the canopy) and tree B (ants are not blocked from the canopy) over the three-year period. You expect __________ because _________
A. higher growth in tree A; the number of aphids will fall because ants are absent, and aphids are parasites of the tree B. higher growth in tree B; the natural environment is always optimized so any change (e.g., blocking the ants from tree A) will reduce the performance of all members of the network C. no change in growth; due to the size difference between the trees and the insects, the presence or absence of insects will not have an effect on tree growth
The following species, P. aeruginosa, P. fluorescens, Pseudomonas putida, P. veronii, Pseudomonas monteilii, and Pseudomonas mosselii, all produce a water-soluble, yellow-green pigment called:
a. pyocyanin. b. pyomelanin. c. pyorubrum. d. pyoverdin.
A tube foot of a sea star moves when the small muscular bulb called the ____ contracts, forcing fluid
into the tube foot.
a. ampulla b. ossicle c. radial canal d. ring canal e. madreporite