The sudden loss of which organism would necessarily cause the loss of most or all of a food web?
A) producer
B) secondary consumer
C) mutualistic species
D) keystone species
D
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In establishing paternity by DNA fingerprinting, what proportion of microsatellite repeat alleles in a child come from the father?
A) only those on the X chromosome B) 1/4 C) 1/2 D) 3/4
Absolute zero
What will be an ideal response?
A community consists of ____ species in a given area
a. one b. two c. three d. four e. all
Which statement about the regulation of respiration is FALSE?
a. Respiratory centers in the medulla control the transition from inspiration to expiration. b. Carbon dioxide concentration is the most important chemical stimulus for regulating respiratory rate. c. Chemoreceptors in the walls of various arteries are sensitive to carbon dioxide levels in the blood. d. A group of neurons in the ventral medulla only become active when we need to breathe forcefully. e. Chemoreceptors may be sensitive to oxygen, carbon dioxide, and/or hydrogen ion concentration.