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.

Biology & Microbiology

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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

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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.

Biology & Microbiology

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

Biology & Microbiology

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.

Biology & Microbiology