An enzyme influences the structure of which of the following?
A) substrate
B) product
C) transition state
D) cofactor
E) intermediate
C) transition state
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True or False: The bright colored patterns of a flower's petals act as signals to an insect that nectar and pollen are available, and in this way the sender manipulates the behavior of the receiver
A. true B. false
The male gametophytes of seed plants consist of a few cells enclosed by a sturdy wall made mostly of the resistant
polymer ____.
a. sporopollenin b. xylan c. lignin d. cellulose e. pectin
Imagine that you have found a mutant oak plant that cannot produce fusiform initials. Which of the
following would be the most direct result of this mutation?
a. The plant would not be able to perform photosynthesis. b. The plant would not be able to make secondary xylem and phloem. c. The plant would not be able to make roots. d. The plant would not be able to transport sugar to the roots. e. The plant would not be able to make leaves.
Many introduced species have deleterious effects on
communities and ecosystems because a. coevolved parasites and competitors are absent. b. the introduced species are long-lived. c. predators prefer the introduced species; therefore, the local prey proliferate to dangerously high levels. d. the communities from which they came lost an important predator, competitor, or parasite. e. all of these occur.