In a transmission electron microscope, the "lenses" are
A) made of glass.
B) thin films of metal.
C) lasers.
D) magnets.
E) vacuums.
D
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Sanjay and Indira have thalassemia minor. Their young daughters are dizygotic (fraternal) twins. Malonie has thalassemia minor like her parents, but Jewel has the more severe thalassemia major. The more serious case most likely arose because
A) Jewel inherited two wild type alleles from her carrier parents. B) Jewel inherited a dominant form of the condition. C) Jewel inherited two recessive mutant alleles in the beta globin gene that cause thalassemia. D) Jewel also has sickle cell disease.
Hybridization of closely related plant species by
doubling the chromosome number always results in a. allopolyploids. b. autopolyploids. c. infertile hybrids that must reproduce asexually. d. inviable hybrids. e. hybrids that are similar to only one of their two parents.
Retaining the zygote on the living gametophyte of land plants _____
A) protects the zygote from herbivores B) evolved concurrently with pollen C) helps in dispersal of the zygote D) allows it to be nourished by the parent plant
IgE antibodies are best described as
A) a cause of basophil and eosinophil degranulation. B) the antibodies found in body secretions. C) those involved in complement activation. D) the trigger for antibody-dependent cellular toxicity (ADCC). E) the most common type of antibody in the blood during the initial phases of an immune response.