Quorum sensing is ___:
a. the ability to respond to changes in population density
b. a characteristic allowing secretion of a matrix
c. dependent on direct contact among cells
d. associated with colonies in broth culture
Answer: a. the ability to respond to changes in population density
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A structure made up of two or more types of tissues that performs a specific set of functions is at what level of organization?
a. Chemical b. Cellular c. Tissue d. Organ e. System
Approximately how many base pairs comprise one turn of the double helix in DNA?
a. 2.5 b. 5 c. 10 d. 20 e. 50
Walking along a mile-long path in the woods, you notice a stand of your favorite wildflower, the cardinal flower, three different times. You find each stand of cardinal flower, including many flowers in each stand, on a stream bank
What type of distribution applies to this example? A) clumped B) uniform C) random D) normal
Crossing over is one of the most important events in meiosis because
A) homologous chromatids must be separated into different daughter cells. B) homologous chromosomes must be separated into different daughter cells. C) the number of chromosomes allotted to each daughter cell must be halved. D) it produces new arrays of alleles on chromosomes. E) All of the choices are correct.