Which of these is not a method used by ectotherms to affect body temperature?
A. countercurrent heat exchange
B. basking in the sun
C. shivering
D. dilation or contraction of blood vessels
E. increasing metabolic rate
E. increasing metabolic rate
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A farmer uses triazine herbicide to control pigweed in his field. For the first few years, the triazine works well and almost all the pigweed dies; but after several years, the farmer sees more and more pigweed. Which of these explanations best explains what happened?
A) The herbicide company lost its triazine formula and started selling poor-quality triazine. B) Natural selection caused the pigweed to mutate, creating a new triazine-resistant species. C) Triazine-resistant pigweed has less-efficient photosynthesis metabolism. D) Triazine-resistant weeds were more likely to survive and reproduce.
The cell walls of fungi are made up of polysaccharides including
A. polyglycans. B. phospholipids. C. bilipid layers. D. glycolipids. E. chitin.
Which characteristic is correlated with cancer cells and metastasis?
a. gain of nuclear-cytoplasmic controls governing cell growth and division b. changes in adhesion proteins on membrane surfaces c. expansion of the cytoskeleton d. normal chromosome number e. deceased blood supply to the tumor
Which term includes sessile and pedunculated types of growth
a. polypoid b. cystic c. medullary d. verrucous e. necrotic