Electron microscopes use what to focus the beam of electrons?

a. electromagnets
b. a condenser lens
c. light rays
d. X-ray diffraction
e. glass


Answer: a. electromagnets

Biology & Microbiology

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Mitochondrial disorders can be caused by mutations in all the following except:

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A person who is infected with a potential pathogen fails to develop signs or symptoms of disease. This correlates with ________ initial microbial dose, ________ microbial lethality, and/or ________ replication rate of the pathogen.  

A. low; high; low B. low; low; high C. high; low; high D. high; low; low

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The human urinary system consists of all of the

following structures EXCEPT

a. urinary bladder. b. urethra. c. two adrenal glands. d. two ureters. e. two kidneys.

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What do all protists possess?

a. cell walls b. multiple, circular chromosomes c. chloroplasts d. microtubules and microfilaments

Biology & Microbiology