HIV is transmitted in ____
a. food
b. water
c. body fluids
d. air
e. infected surfaces
ANSWER: c
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Four of the five answers below are correct statements about exoskeletons. Select the exception
a. an exoskeleton consists of noncellular secreted material. b. repeatedly producing new exoskeleton uses resources that the animal could put towards growth and reproduction. c. the exoskeleton is made of bone and cartilage. d. the exoskeleton protects the soft body tissues inside it. e. exoskeletons exist in some invertebrates.
The greenhouse gas presently at highest concentration in the Earth’s atmosphere is methane. Indicate whether the statement is true or false
Which of the following produces pili that are subject to both phase and antigenic variation?
A. Chlamydia trachomatis B. Neisseria gonorrhoeae C. Escherichia coli D. Candida albicans
Gastrulation produces ____.
A. hollow balls of cells B. embryos with three primary tissue layers C. solid balls of cells D. specific organs E. dead tissue