The specimen preparation that is best for viewing cell motility is
A. fixed-stained smear.
B. hanging drop.
C. flagellar stain.
D. Gram stain.
E. negative stain.
Answer: B
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In humans, sickle-cell anemia is caused by an allele that results in abnormal hemoglobin that sickles red blood cells in certain situations. Individuals who are heterozygous for normal and sickle-cell alleles are protected from malaria; homozygous normal has no protection and homozygous sickle-cell has symptoms such as low tolerance for exertion and a shortened life span. This is an example of
A. stabilizing selection. B. directional selection. C. disruptive selection. D. balancing selection. E. cryptic selection.
Outline the two parts of the eukaryotic cell cycle and describe the three main checkpoints in cell cycle regulation
What will be an ideal response?
What happens when the cAMP-CAP complex binds the CAP site near the lac promoter?
A. RNA polymerase binds to the promoter and transcription rate decreases. B. Transcription rate decreases. C. Transcription rate increases. D. RNA polymerase binds to the promoter. E. RNA polymerase binds to the promoter and transcription rate increases.
The worldwide, primary viral cause of morbidity and mortality from diarrhea is
A) Influenza viruses B) Rhinoviruses C) Rotavirus D) Coxsackie viruses E) Caliciviruses