A healthy, young couple are carriers of cystic fibrosis; the chance that each of their future children will inherit this serious illness is
A. 50%.
B. 0%.
C. 75%.
D. 25%.
E. 100%.
D. 25%.
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Some anaerobic bacteria not only use organic compounds as a carbon source but can also use them for energy as well
Indicate whether the statement is true or false.
Adaptation to oxygen concentration
What will be an ideal response?
Root hairs:a
protect the delicate cells of the apical meristem. b. help orient the root so it will grow downward. c. increase the capacity of roots to absorb water. d. are sparse and extremely long. e. are located at each node on the root.
A biologist is studying the population dynamics of pocket gophers in a meadow in central Oregon. She noted that, when population numbers are high, death rates from disease and starvation increase. This is an example of:
A) r-selected growth. B) the principle of intrinsic rate of growth. C) density dependent control. D) exponential growth.