Toads in a particular population vary in size. A scientist observes that in this population, large males mate with females significantly more often than small males do. All the following are plausible hypotheses to explain this observation EXCEPT:
A. Females select large males more often than they select small males as mates
B. Small females are more likely to mate with small males and large females are more likely to mate with large males
C. Large males are successful in competing for mates more often than small males are
D. Large males occupy more breeding territory than small males do
E. The calls produced by large males are more attractive to females than the calls made by small males
Ans: B. Small females are more likely to mate with small males and large females are more likely to mate with large males
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Animals that obtain most of their heat from the environment are (select all correct choices):
A. ectotherms. B. cold-blooded. C. more likely to use behavioral means to regulate body temperature than physiological means. D. unable to maintain a constant core body temperature. E. most active in the night in order to generate as much heat as possible.
Answer the following statements true (T) or false (F)
1. All sugars are absorbed via secondary active transport. 2. In omnivores, including humans, the cecum is an important organ for digestion of cellulose. 3. Fat absorbed by the small intestine enters the lymphatic system. 4. Frugivores are a type of herbivore.
The microtubule organizing center (MTOC) of an animal cell is an identifiable structure known as the
____.
a. cell plate b. centrosome c. kinetochore d. centromere e. chromosome
Which of the below is a hallmark of cancer?
a. generate their own mitogenic signals b. resist exogenous growth-inhibitory signals c. evade apoptosis d. all the above are hallmarks of cancer