Which human activity is an example of hydrologic alteration?
a. overfishing
b. small-scale diversion of water for agriculture
c. damming of rivers
d. digging wells
e. desalination
ANSWER: c
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What are some diseases associated with imprinting?
A. Angelman Syndrome B. LHON C. Alzheimer's Disease D. All of the answers are correct
Siberian tigers and grizzly bears became endangered for __________ reason(s);
____________________.
a. different; tigers encountered disease and bears were overhunted b. different; bears encountered disease and tigers were overhunted c. the same; both encountered disease d. the same; both were overhunted
If an operon is regulated by ____ control, genes are ____ by a regulatory protein called a ____
a. positive; on unless they are switched off; repressor b. negative; off unless they are switched on; repressor c. negative; on unless they are switched off; repressor d. positive; off unless they are switched on; repressor e. positive; on unless they are switched off; activator
Aquatic animals that rely on external fertilization for reproduction have a low probability of successful fertilization. Which of the following is a mechanism used to increase the liklihood of successful external fertilization?
A. courtship rituals to synchronize male/female gamete release B. depositing sperm into the female reproductive tract C. production of extremely large number of gametes that are released simultaneously D. containment of sperm within spermatophores