The ability of some viruses to remain inactive (latent) for a period of time is exemplified by _____
A) influenza, a particular strain of which returns every 10-20 years
B) herpes simplex viruses (oral or genital) whose reproduction is triggered by physiological or emotional stress in the host
C) Kaposi's sarcoma, which causes a skin cancer in people with AIDS but rarely in those not infected by HIV
D) the virus that causes a form of the common cold, which recurs in patients many times in their lives
B
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What is the function of surfactant in the mammalian respiratory system?
A. reduction of surface tension in the fluid covering the alveoli B. capture and removal of inhaled foreign particles C. maintaining a moist surface D. transport of oxygen E. It functions as an antibiotic.
A 38-year old woman is going to ovulate in about a week. For how long has the primary oocyte in her Graafian follicle been arrested at prophase I of meiosis?
A. About a day B. 1 week C. 3 weeks D. 38 years
The production of sex hormones in humans increases ____
a. during fetal development b. during teenage years c. during pregnancy d. at puberty e. at birth
The first part of the small intestine is the
a. duodenum. b. ileum. c. pylorus. d. cecum. e. jejunum.