One effect of auxin, which triggers the elongation of cells, is to affect cell walls by increasing their
A. permeability.
B. plasticity.
C. stiffness.
D. thickness.
E. water solubility.
B. plasticity.
Auxin has many roles in a plant, two of which are to increase the plasticity (flexibility) of plant cell walls and stimulate stem elongation.
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Which of the following microorganisms are considered obligate intracellular pathogens?
A) chlamydias, rickettsias, Mycobacterium leprae, and Treponema pallidum B) Mycobacterium leprae and Treponema pallidum C) Mycobacterium tuberculosis and viruses D) rickettsias, chlamydias, and viruses
Matching: Match the definition with the word.1) monotrichous2) peritrichous3) lophotrichous4) amphitrichousa. a single flagellumb. a single flagellum at each pole of an organismc. a cluster of flagella at one or both ends of an organismd. a relatively even distribution of flagella over the entire surface of the bacterium
Fill in the blank(s) with the appropriate word(s).
According to Lamarck, the characteristics of
organisms change because of a. chance. b. an innate drive for perfection. c. extinction of competitors. d. special acts of creation. e. genetic mutation.
How does natural selection favor an individual that can detect 'deceitful communicators' such as the yellow 'sneaker' male side-blotched lizard Uta stansburiana?
A) On average, the frequency of deceitful communicators will decrease. B) On average, the frequency of deceitful communicators will increase. C) The detector will incur less cost and gain an advantage over others unable to detect the deceit. D) Natural selection does not operate in this way. E) B and C