Which of the following statements about transmission electron microscopy is CORRECT?
A) Three-dimensional images are produced.
B) Lasers are used for visualization.
C) Up to 1,000,000X magnification may be achieved.
D) Living specimens may be used.
E) Stains can be applied to create a color image.
C
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The most common sexually transmitted bacterial pathogen and a major cause of pelvic inflammatory disease (PID) is:
a. Rickettsia rickettsii. b. Chlamydia trachomatis. c. Klebsiella granulomatis. d. Coxiella burnetii.
A narrowing of the coronary arteries may
a. be treated by balloon angioplasty b. cause a heart attack. c. be treated by coronary bypass surgery. d. be treated by laser e. include all of these.
Genetics studies of human populations have revealed that
A) it is nearly impossible to determine the relatedness of human populations. B) Homo sapiens probably did not evolve from primates. C) humans have very little genetic variation compared to other mammals. D) all humans are virtually identical. E) human populations vary tremendously at the level of DNA sequences.
Hemophilia is a sex-linked recessive gene that causes a blood disorder. What are the chances that the daughter of a normal man and a heterozygous woman will have hemophilia?
A) 25% B) 0% C) 50% D) 100% E) 75%