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
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Mitochondrial disorders can be caused by mutations in all the following except:
A. mitochondrial DNA B. nuclear DNA C. cytoplasmic DNA
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
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.
What do all protists possess?
a. cell walls b. multiple, circular chromosomes c. chloroplasts d. microtubules and microfilaments