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.
B
C. trachomatis causes significant infection and disease worldwide. In the United States, C. tra-chomatis is the most common sexually transmitted bacterial pathogen and a major cause of PID. An estimated 3 million C. trachomatis infections occur annually in the United States.
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Besides Darwin, the theory of evolution by means of natural selection was also independently proposed by:
A. Charles Lyell. B. Karl Popper. C. Thomas Malthus. D. Peter Raven. E. Alfred Wallace.
Restriction enzymes
a. work at specific base sequences b. function only at “sticky ends.” c. produce uniform lengths of DNA. d. function in viruses. e. are produced by viruses to break down bacterial DNA.
Which substance can enter a cell by diffusion without having to be digested?
A. water B. protein C. starch D. fat
Mendel's monohybrid experiment results led to his law of __________.
Fill in the blank(s) with the appropriate word(s).