Which of the following is the largest group of hormones?
a. steroid hormones
b. polysaccharide hormones
c. amino acid derivatives
d. peptide hormones
e. fatty acid derivatives
d
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Why is hypertension common among elderly people?
a. It arises from years of improper diet. b. It is due to constant exposure to chronic diseases. c. As blood vessels age, blood vessels stiffen and lose flexibility. d. Risk factors tend to increase with increasing age
Two species utilizing the same food source is an example of ____
a. coevolution b. mimicry c. interference competition d. exploitative competition e. mutualism
Biologists believe that whooping cranes suffer from a high rate of developmental deformities of the spine and trachea
because of ____.
a. biological magnification of DDT b. exposure to hormone-mimicking pollutants from plastics c. a population bottleneck and loss of genetic variability d. conservation biologists saving chicks that would have died at hatching e. exposure to PCBs used as insulators in electronics
Which of these examples represents a gene family?
A) A genome includes many genes that encode myosin motor proteins. B) All of the genes that are required for gamete formation in humans. C) A gene encoding a kinase is similar in humans, chimps, and mice. D) A genome includes many pseudogenes. E) All of the genes that are expressed in a single tissue.