Lethal mutations can be maintained in diploid organisms if they are ________.
A. deletions
B. recessive
C. dominant
D. None of the choices are correct.
Answer: B
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The evolutionary significance of phage conversion likely stems from an effective alteration of host cells
Indicate whether the statement is true or false.
Two intermediates of the sterol biosynthesis pathway, isopentenyl diphosphate and dimethylallyl diphosphate, are used by archaea in the biosynthesis of ________.
A. isoprenoids B. hormones C. diacylglycerol D. nucleotides
Which substance builds up abnormally in Alzheimer's disease?
a. glycogen b. fat c. amyloid protein d. glycolipids e. aminoglycosides
A 9-month-oId infant is seen by a physician because of a persistent skin infection. His white and red blood cell counts are normal. However, immunofixation electrophoresis indicates a low level of IgG. When the infant returns to the physician for a follow-up visit in a month, his IgG level has increased. What condition do these results indicate?
A. Severe combined immunodeficiency B. Transient hypogammaglobulinemia C. Common variable immunodeficiency D. DiGeorge anomaly