Bilirubin is
a. converted to ammonia by the liver.
b. converted to urea by the liver.
c. a pigment that gives bile its yellow-green color.
d. is formed from recycled hemoglobin.
e. is the same as bile salt.
D
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Dead or damaged cells are replaced by the process of ________.
A. mitosis B. meiosis C. binary fission D. fertilization
What does the directed-pollination hypothesis suggest?
A. Plants are only directly pollinated when other plants of the same species are nearby. B. Plants that self-pollinate are directed (triggered) to do so by the absence of nearby plants of their species. C. Natural selection has favored flower traits (scent, shape, color) that attract pollinating animals. D. Pollination is a process that is directed (triggered) by key plant hormones.
A substance that diffuses across a cell membrane tends to move _______.
a) toward the area where it is more concentrated b) away from the area where it is less concentrated c) none of the choices is correct d) away from the area where it is more concentrated
Which of the following is not a basic characteristic of life?
a. Taking in energy and materials. b. Sensing and responding to changes in the environment. c. Locomotion. d. Reproducing and growing. e. Consisting of one or more cells.