Which group of organisms is not classified as ectotherms?
a. All of these choices are ectotherms
b. Fish
c. Amphibians
d. Lizards
e. Mammals
e
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Three critical amino acids in the active site of an enzyme are leucine, tryptophan, and alanine. Which of the following characteristics would you predict the substrate to possess in order to bind the active site of this enzyme?
A. relatively hydrophobic B. hydrophilic, with a negative charge C. hydrophilic, with a positive charge D. hydrophilic, but without a charge
Homozygotes with the genotype HbS/HbS have
a. sickle cell anemia. b. malaria. c. blood type SS. d. Fanconi's anemia. e. sickle cell trait.
Which syndrome is characterized by a karyotype with 45 chromosomes?
A. Turner B. Down C. Androgen insensitivity D. Klinefelter E. Cri-du-chat
In general, most antibiotics work by:
A) boosting the human immune system. B) preventing viruses from entering human cells. C) preventing bacteria from entering human cells. D) exploiting differences between human and bacterial cells.