Which type of microscope bombards a whole, metal-coated specimen with electrons moving back and forth over it?

A. Phase-contrast
B. Transmission electron
C. Fluorescence
D. Differential interference contrast
E. Scanning electron


Answer: E

Biology & Microbiology

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Relatively small organic molecules with a central carbon atom which is bonded to a carboxyl group, an amino group, a carbon containing group, and a hydrogen atom are called:  

A.  amino acids. B.  fatty acids. C.  enzymes. D.  peptides. E.  nucleotides.

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Hemoglobin transports oxygen in the blood and consists of a chain of 146 amino acids. How many different types of amino acids are used to construct proteins?  

A.  2 B.  20 C.  146 D.  200

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What color develops when I2KI reacts with starches in a sample?

a. Blue b. Blue-green c. Purple d. Red

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