Simple staining is often necessary to improve contrast in which microscope?
A) compound light microscope
B) phase-contrast microscope
C) darkfield microscope
D) fluorescence microscope
E) electron microscope
A
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In which choice are the entries listed from smallest to largest?
A) DNA building block - gene - chromosome - genome B) DNA building block - RNA building block - protein C) Gene - cell - DNA - genome D) Chromosome - genome - cell - DNA building block
Which of the following is a shared characteristic of prokaryotic and eukaryotic organisms?
a. capsule b. ribosomes c. pili d. nucleoid
Oxidizing agents include all of the following EXCEPT
A) chlorine. B) glutaraldehyde. C) hydrogen peroxide. D) iodine. E) ozone.
Which of these is the main function of the blood-brain barrier?
Protects the CNS by selecting the substances that can enter the cerebrospinal fluid from the blood Prevents any molecules from entering the cerebrospinal fluid from the blood Coordinates the nervous and endocrine systems by influencing the pituitary gland Filters sensory input and keeps the cerebral cortex in an alert state