In the food chain of a typical lake, which of the following would be a producer?
a. algae
b. trout
c. mollusk
d. turtle
a. algae
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Which of the following will NOT result in a proto-oncogene's conversion into an oncogene?
a. A mutation in the proto-oncogene's promoter that increases transcription of the gene. b. A mutation in the coding sequence of a protein that renders a protein abnormally active. c. An alteration to the p53 coding sequence rendering the p53 protein inactive. d. An introduction of new DNA sequences to a chromosome that alters the regulation of the cell cycle. e. The translocation of a proto-oncogene to a location in the cell and under the control of a more active promoter than present in the original location.
The cell junction labeled “C” in the figure
a. prevents movement of materials between cells. b. is found in tissues subjected to stretching. c. anchors cells to each other and to the intracellular matrix. d. is found abundantly in surface epithelia. e. is found in most tissues except heart muscle.
Mitosis differs from meiosis in that only mitosis
A) is preceded by interphase. B) involves two successive cell divisions. C) results in the production of haploid cells. D) involves the pairing of homologous chromosomes during prophase I. E) results in cells that are genetically identical to the original cell.
Gravitropism is a plant's
A) ability to form an abscission layer, so that the fruits and leaves fall from the plant. B) ability to grow only upward. C) apical dominance. D) response to stress-inducing situations. E) directional response to gravity.