The classic "beads-on-a-string" structure is the most decondensed chromatin structure possible and is produced experimentally. Which chromatin components are not retained when this structure is generated?
(a) linker histones
(b) linker DNA
(c) nucleosome core particles
(d) core histones
(a)
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Diatoms dominate coastal waters of tropical and subtropical areas
Indicate whether the statement is true or false
Plant cells produce oxygen gas
a. by splitting carbon dioxide. b. during respiration. c. by splitting ribulose bisphosphates. d. by splitting molecules of water. e. by breaking down glucose
The modification of behavior as a result of experience is called
A. association. B. behavior modification. C. habituation. D. learning. E. sensitization.
Over two decades ago in the People's Republic of China, it was noticed that songbirds were eating rice and millet drying on the grain floors. Since there were large numbers of people to feed, and the population was very near to carrying capacity, it was proposed that the songbird population should be reduced in order to preserve more grain. However, the songbirds also ate a larger number of insects that fed on the rice and millet when it was young. Draw a food web including the above items, indicating energy flow in the direction of the arrows, and representing the general proportion of energy consumed by the breadth of each arrow. State briefly why this decision was disastrous.
What will be an ideal response?