A CBC, differential, and flow cytometry were performed on a patient with the following results (normal values): WBC = 8.0 th/uL (5.0-10.0 th/uL), diff = 90% lymphs (20-40%), CD3 = 5% (60-80%), CD5 = 95% (60-80%), CD19 = 95% (5-20%), CD10 = 0% (0%), surface Ig = pos (positive), and cytoplasmic Ig = neg (negative). What disease does this patient have?
A) B-cell acute lymphocytic leukemia
B) B-cell chronic leukemia
C) T-cell acute lymphocytic leukemia
D) T-cell chronic leukemia
E) AIDS
Ans: B) B-cell chronic leukemia
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In the figure, when new viruses are being assembled at the point marked IV, what mediates the assembly?
A) host cell chaperones B) assembly proteins coded for by the host nucleus C) assembly proteins coded for by the viral genes D) viral RNA intermediates E) nothing; they self-assemble
________ is(are) responsible for more cancers than any other carcinogen
A) Asbestos B) UV radiation C) Tobacco D) X-rays
Due to single nucleotide polymorphisms (SNPs), all humans have a slightly different nucleotide sequence for their genome. Restriction mapping is used in forensic sciences to match DNA evidence to a potential suspect of a crime. How does restriction
mapping reduce the likelihood of misidentifying a suspect? A) SNPs add and remove restriction sites resulting in a unique "fingerprint" for each person B) SNPs only remove restriction sites from the genome resulting in a unique "fingerprint" for each person C) SNPs change the genes that are expressed D) SNPs only add new restriction sites to the genome resulting in a unique "fingerprint" for each person
Action potentials differ from graded potentials in that __________.
A) action potentials, but not graded potentials, can be triggered by the opening of gated ion channels B) action potentials propagate along an axon away from the cell body, whereas graded potentials propagate toward the cell body C) action potentials are hyperpolarizations, whereas graded potentials are depolarizations D) only action potentials occur at the axon hillock of a neuron E) action potentials are all of the same magnitude