A cyclist rides her bike up a very steep hill. Which statement properly describes this example in energetic terms?
A) Potential energy is highest when the cyclist just begins to ascend the hill.
B) The cyclist produces the most potential energy as she cruises down the hill's steep slope.
C) Gravity provides a source of kinetic energy.
D) Potential energy in food is converted to kinetic energy as the cyclist's muscles push her up the hill.
E) Kinetic energy is highest when the cyclist is at the crest of the hill.
D) Potential energy in food is converted to kinetic energy as the cyclist's muscles push her up the hill.
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Proteins are three dimensional molecules made of strands of amino acids (imagine a ball of string). There are 20 different amino acids used in proteins found in living organisms. Some of these amino acids are polar and others are non-polar. Where would a series of non-polar amino acids most likely be located in a protein that is found in the cytosol of an animal cell?
A. On the surface of the protein B. In the interior of the protein C. At the very top of the protein D. At the very bottom of the protein
Which structure grows faster than any other as the embryo develops?
a. the heart b. the nervous system c. the head d. the digestive system e. the urinary system
Hypersecretion of growth hormone in adulthood leads to enlarged hands, face, and feet, a condition
known as: a. dwarfism. b. gigantism. c. acromegaly. d. goiter. e. cretinism
Genetics studies of human populations have revealed that
A) it is nearly impossible to determine the relatedness of human populations. B) Homo sapiens probably did not evolve from primates. C) humans have very little genetic variation compared to other mammals. D) all humans are virtually identical. E) human populations vary tremendously at the level of DNA sequences.