Which one of the following carcinogens accounts for 30% of all cancer deaths?
A) environmental chemicals (e.g., asbestos, pesticides, soot, coal tar)
B) tobacco smoke
C) ultraviolet light
D) ionizing radiation (X rays)
E) radon gas
B
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The purpose of the distasteful odor emitted from the stinkhorn fern is to
a. attract flies. b. discourage predators. c. mimic another fungus. d. prevent plants from growing nearby.
Fixed smears of specimens are required to perform the Gram stain or the endospore stain.
Answer the following statement true (T) or false (F)
DNA barcoding:
A: is a type of reverse genetics. B: is the most commonly used type of DNA fingerprinting used by the FBI. C: attempts to provide a unique sequence identifier for all life forms. D: is based mainly on repetitive DNA. E: is used for prenatal genetic screening.
In ________ countries, the doubling time is often small
Fill in the blank(s) with correct word