Name two human disorders that appear to be transmitted extrachromosomally
A) poky chromosome syndrome and kidney cancer
B) reactive oxygen syndrome and myoclonic epilepsy and ragged red fiber disease
C) myoclonic epilepsy and ragged red fiber disease and Leber's hereditary optic neuropathy
D) Duchenne muscular dystrophy and Down syndrome
E) cri-du-chat syndrome and Leber's hereditary optic neuropathy
Answer: C
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The results of an experiment
(a) don’t have to be repeatable. (b) should be repeatable by the investigator. (c) should be repeatable by other investigators. (d) must be both b and c.
Figure 23.2 in your text represents a phylogenetic tree of the vertebrate animals. According to this tree, what is the sister group to the tetrapods?
A. sauropsids B. mammals C. lungfish D. amphibians E. coelacanths Answer Point Value: 1.0 points Answer Key: C 5 Reference: Ref 23-1 According to Figure 23.2 in your text, what is the sister group to mammals? A. sauropsids B. tetrapods C. birds D. crocodiles and alligators E. birds plus crocodiles and alligators
Respond to statements 87–91 with reference to the four levels of
organization listed below. a. population b. community c. ecosystem d. biosphere E 87. This is composed of producers, consumers, decomposers, and the abiotic environment. E 88. All of the individuals of a single species living in a region constitute this. M 89. A group of different species living together in a single habitat is this. M 90. This is the basic functional unit of ecology. E 91. This encompasses all of the others.
Match each description to its correct term.
A. a mesh of cytoskeletal elements that attach the sarcomere to its surrounding components B. substance that binds to the thick-filament head causing it to release thin filament and return to its low-energy state C. supply the ATP necessary for muscle contraction D. component of thin filaments E. contractile units of muscle F. cross-bridge is formed between thick and thin filaments following the release of this substance from ATP bound to myosin G. threadlike protein structures consisting of contractile units arranged end to end; comprises the bulk of the muscle fiber H. consists of sarcomeres that are not aligned I. consist of myosin, a motor protein with a clublike head and a long tail J. this protein repeatedly binds, moves, and releases an adjacent thin filament causing a muscle to contract K.