Poliomyelitis is an RNA virus that can invade the nervous system and cause paralysis within a matter of hours. Polio has been virtually eliminated world-wide by which of the following?
a. Antibiotics
b. Vaccination
c. Mosquito control
d. Quarantine
e. Improve water quality
Answer: b. Vaccination
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Bacterial proteins were radioactively labeled and fed to phagocytic cells. The proteins within the phagocytic cell became increasingly more radioactive over time. This observation is the result of the activity of
A) mitochondria. B) chloroplasts. C) lysosomes. D) peroxisomes. E) the Golgi apparatus.
A(n) __________ consists of hardened parts inside the body. Fill in the blank(s) with the appropriate word(s)
At what temperature is water most dense?
a. 0 degrees Celsius b. 1 degree Celsius c. 4 degrees Celsius d. 10 degrees Celsius e. 100 degrees Celsius
The long extension of a cell that can propel a cell forward by whipping back and forth (such as human sperm) is called a ________
A) vesicle B) flagellum C) pilus D) cilium