An intron is a section of ________
A) DNA that is removed during DNA processing
B) RNA that is removed during RNA processing
C) protein that is clipped out posttranslationally
D) carbohydrate that serves as a signal for RNA transport
E) transfer RNA that binds to the anticodon
B
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A young child grows rapidly, with high levels of cell division and high-energy requirements. If you were planning the child’s diet, which food groups would you emphasize, and why? Which food groups would you deemphasize, and why?
What will be an ideal response?
An advantage of sexual reproduction is:
a. a large number of offspring. b. genetically diverse offspring. c. offspring that are specially adapted to the stable environment of their parents. d. offspring that are genetically identical to the parents.
Which chemical secreted in the alveoli reduces surface tension?
a. oxyhemoglobin b. pulmonary surfactant c. carboxyhemoglobin d. secretory IgA e. mucus
An oxygen atom in water has two covalent bonds with hydrogen atoms and two unpaired electrons. How many hydrogen bonds can a water molecule form?
A. 4 B. 5 C. 1 D. 3 E. 2