Irradiation of cells with ultraviolet light may cause
A.
four nucleotides to covalently bind together.
B. thymine dimers.
C. adenine complementary base pairing with cytosine.
D. the addition of uracil.
B
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Each cone responds primarily to a single color. What kinds of cones are present in the human retina?
a. Two cones that perceive red or blue light. b. Three cones that perceive red, blue, or green light. c. Three cones that perceive orange, green, or purple light. d. Three cones that perceive red, blue, or yellow light. e. Four cones that perceive red, blue, yellow, or green light.
Which of the following groups is suspected of causing climate change?
A. fossil fuel and hydropower usage B. erosion, deforestation, pollution, and desertification C. overfishing and hydropower usage D. ocean acidification and desertification E. fossil fuel usage, deforestation, and agriculture
You are worried about your friend Mary, a type 1 diabetic. She is nauseated, short of breath, tired, and confused. She says not to worry because she just has a case of the flu
What diagnostic test should you urge her to perform to make sure that there is nothing more serious going on? A) blood bilirubin B) urinary ketones C) blood pressure D) stress test for the heart
Flatworms have simple kidneys consisting of tubular structures called nephridia
Indicate whether the statement is true or false