The emergency contraceptive pill (ECP) works by
A. killing the embryo.
B. changing the pH of the uterus.
C. killing sperm.
D. preventing ovulation.
D. preventing ovulation.
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Which gas has had the greatest impact on life
on earth?
a. carbon dioxide b. methane c. nitrogen d. hydrogen e. oxygen
The clitoris of the female and a portion of the penis of the male are homologous structures. This means they have a similar
a. function. b. structure. c. developmental origin. d. origin and structure.
Humans with the condition of familial Down syndrome exhibit which type of chromosomal aberration?
A) chromosome 21 duplication B) chromosome 21 inversion C) chromosome 14/21 Robertsonian translocation D) chromosome 21 deletion E) trisomy of chromosome 21
Which of the following statements is NOT true of Gram-positive bacteria?
A. They lack the lipopolysaccharides that Gram-negative bacteria have. B. They turn purple when subjected to the Gram-staining process whereas Gram-negative bacteria stain pink. C. They have a thicker peptidoglycan layer than do Gram-negative bacteria. D. They have a gram molecular weight of more than 1.0 whereas Gram-negative bacteria have a gram molecular weight of less than 1.0. E. They are less resistant to antibiotics than Gram-negative bacteria.