The process by which cells acquire specialized forms and functions is called
A. cell differentiation.
B. cell replication.
C. cell growth.
D. cell elasticity.
E. None of the choices are correct.
Answer: A
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Based on the experiment in the figure above, which of the following are plausible reasons for the result?
I) No nutrients evaporate now that vegetation is absent. II) Nutrients dissolve in the water running through the watershed. III) Nutrients are attached to small particles of sand or clay that leave the watershed. IV) Plant roots that held soil particles in place are no longer there. A) only I and III B) only II and IV C) only I, II, and IV D) only II, III, and IV E) only I, II, and III
What is a noncoding, repetitive DNA sequence at the end of chromosomes?
a. telomere b. guanine cap c. transposons d. telomerase e. tandem repeats
In which of the situations below would a plant be at greatest risk for the formation of air bubbles in the xylem stream?
A. during the night, when transpiration is low B. during the afternoon, when transpiration is highest C. in the early morning, with cooler temperatures and calm winds D. in the day during a drought E. the risk is the same at any time of day
An individual plant was discovered that could not grow towards light. After some research, it was determined that the reason was a defective gene that did not allow for the level of cell elongation necessary for a phototropic response. This mutation greatly reduces the fitness of the individual plant. Which reason best describes the reason for the loss of fitness?
A) The plant was too short to attract insects for pollination. B) The plant could not adjust to directional light, which reduced photosynthetic activity and therefore energy available for reproduction. C) Because the plant grew much taller and straighter, resources that could be used for reproduction were used for growth. D) The loss of a phototropic response meant that the plant's seeds could not germinate so reproduction would be unsuccessful.