Which one of the following nitrogenous bases is not found in an RNA molecule?
A) adenine
B) guanine
C) thymine
D) uracil
C) thymine
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Toxic elements such as mercury and arsenic are
found in the human body because a. of contamination from the environment. b. trace amounts of these elements have vital biological functions. c. they are needed to kill bacteria. d. they may be ingested with food but inactivated by cells. e. in small amounts they are biologically inactive and tolerated by cells.
A patient has a heart attack and wakes up in the hospital. He gets a visit from his doctor, who says he had to shock the patient's heart because part of it had gone into fibrillation. The doctor jokes that it could have been worse if the other part of
the heart had been in fibrillation and that the patient was really lucky. Which chambers of the heart in the patient were in fibrillation, the atria or the ventricles? What will be an ideal response?
What three plant tissue systems are contained in the stem?
A. root hairs, meristem, and vascular B. dermal, vascular, and ground tissue C. dermal, meristem, and vascular D. dermal, ground tissue, and meristem
Which soil region is the most fertile soil layer where the roots of most herbaceous plants are located?
a. A horizon b. B horizon c. C horizon d. D horizon e. O horizon