Which of the following is secreted by a sexually mature woman?

A) testosterone, only
B) estrogen, only
C) progestins, only
D) All of these are secreted by a sexually mature woman.


D

Biology & Microbiology

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A Petri dish containing isolated colonies of Staphylococcus aureus, Escherichia coli, and Pseudomonas aeruginosa would be described as being

A) A mixed culture B) An axenic culture C) A pure culture D) A contaminated culture

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The most common chronic blood-borne infection in the U.S. is

A. hepatitis A B. hepatitis B C. hepatitis C D. hepatitis D

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The yellow zone in the tropical middle intertidal owes its color to:

a. sponges. b. boring algae. c. barnacles. d. limpets. e. crabs.

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Which of the following types of microscopes provides a 3-dimensional image of the surface of cells and viruses?

A. Transmission electron microscope B. Scanning electron microscope C. Brightfield microscope D. Darkfield microscope

Biology & Microbiology