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

Biology & Microbiology

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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.

Biology & Microbiology

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.

Biology & Microbiology

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.

Biology & Microbiology

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

Biology & Microbiology