Which of the following statements regarding cancer risk factors is false?
A) Factors that alter DNA and make cells cancerous are called carcinogens.
B) Mutagens are usually not carcinogens.
C) X-rays and ultraviolet radiation are two of the most potent carcinogens.
D) Eating 20-30 grams of plant fiber daily and reducing the intake of animal fat can reduce your risk of developing colon cancer.
Answer: B
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Though the known diversity of acetotrophic methanogens is low, they are ecologically significant in nature
Indicate whether the statement is true or false.
In the savanna, ____ lasts for months
a. cold temperatures b. storms c. periods of fast growth d. fires e. droughts
The urinary system helps to maintain the extracellular fluid pH by ____
a. synthesizing buffers b. retaining carbon dioxide in the filtrate c. excreting excess hydrogen ions d. combining hydrogen ions with urea e. excreting filtrate
Which of the following is/are TRUE regarding the function of the amygdala?
a. amygdalectomy leads to decreased fear and aggression b. electrical stimulation of the amygdala leads to reduced vigilance and attention levels c. human patients with amygdala damage fail to recognize fear in the facial expressions of others a. all of the above b. a and c