The worldwide, primary viral cause of morbidity and mortality from diarrhea is
A. Rhinoviruses.
B. Caliciviruses.
C. Influenza viruses.
D. Rotavirus.
E. Coxsackie viruses.
Answer: D
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A patient is rushed to the emergency room and immediately needs a blood transfusion. The patient is found to have only anti-A antibodies in circulation. The blood type of this individual must be
A) A. B) B. C) AB. D) O.
The optimal pH range for most freshwater fishes and invertebrates is
A. 2 - 6. B. 2 - 4. C. 4 - 6. D. 6 - 9. E. 8 - 11.
Darnell and Tinaka are each carriers of an autosomal recessive disorder that is lethal in early childhood. They want to have a child who is free of the disease, so they have preimplantation genetic diagnosis. Unfortunately, their child has the disease. A scientific explanation is that
A) the blastomere that was tested had undergone a somatic mutation, making it not representative of the rest of the embryo. B) Darnell was not really the father. C) the 7 cells of the remaining embryo each underwent a mutation, so the sampled cell was not representative. D) Darnell or Tinaka is really homozygous recessive, and not heterozygous.
Which of the following characteristics is not shared by typical birds and mammals?
a. four-chambered heart b. milk production c. four limbs d. endothermy e. insulating skin structures