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

Biology & Microbiology

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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

Biology & Microbiology

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.

Biology & Microbiology

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

Biology & Microbiology

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

Biology & Microbiology