Research has shown that commercial fisheries place selective pressure on fish populations by harvesting mostly the
____ fish, resulting in ____.
a. young; aging populations
b. larger; maturity at smaller sizes
c. smaller; maturity at larger sizes
d. prereproductive; declining birth rates
e. postreproductive; no change in population size
ANSWER: b
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Mammals have two traits that set them apart from all other animals. These are
a. body hair or fur, and being homeothermic. b. amniotic eggs and milk production. c. four-chambered heart and milk production. d. body hair or fur, and milk production. e. four-chambered heart and body hair or fur.
How might the timing of when fruit falls from a tree be important in sympatric speciation?
A. Apple fruit drops earlier than hawthorn fruit to reduce the interaction of the fly species in time. B. Apple fruit falling earlier is a vicariant event. C. Fruit ripening is important for increased reproductive output. D. Apple fruits fall at the same time as hawthorn fruits, thereby being sympatric
Salmonella (lactose NON-fermenter &hydrogen sulfide producing bacteria) growing on the Salmonella-Shigella Agar will appear as
A. Clear colonies with have black centers due to precipitation of iron salt B. Clear or amber colonies C. Blue-black colonies D. Pink or red colonies E. Blue-black colonies with green metallic sheen
A polyunsaturated fat contains fatty acids with multiple double-bonded carbons.
Answer the following statement true (T) or false (F)