In the biology lab, you are shown petri dishes of cheek cell cultures. One set of cells is thin, with individual cells arranged in a single, orderly layer. The other culture shows irregular crowding of cells. The crowding cells are likely cancer cells, showing an absence of
A. telomerases.
B. All of the answer choices are correct.
C. oncogenes.
D. contact inhibition.
E. angiogenesis.
D. contact inhibition.
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Proteins perform four of the following functions. They do NOT, however ____
a. act as enzymes b. store large amounts of energy c. act as transport molecules d. bind molecules to or inside cells e. adjust cell activities
Which of the following statements concerning sensory receptors is false?
a. They transduce the energy of a stimulus into electrical signals. b. They are specialized neuron endings or specialized cells in close contact with neurons. c. They are the main centers for integrating sensory input. d. They depolarize in response to a stimulus. e. They operate by opening or closing ion channels in the plasma membrane.
During his trip on the Beagle, Darwin found that ________
A) plants and animals living in temperate regions were most similar to each other, regardless of the continent on which they were found B) plants and animals living on a continent seemed more closely related to each other than to plants and animals living in similar regions on other continents C) fossils found on a particular continent were clearly not related to the plants and animals living on that continent today D) plants and animals were similar on every continent and in every type of region
A newly sequenced gene is cloned and expressed in a bacterial cell. The bioinformatics databases suggest that this gene produces an enzyme that catalyzes the conversion of carbon dioxide to bicarbonate. After weeks of experiments, a scientist determined
the enzyme has a completely different function. This is an example of ________. A) incorrect qPCR B) incorrect enzyme experiments C) incorrect annotation D) incorrect sequencing E) incorrect BLAST parameters