Mammals are thought to be living descendants of ____
a. anapsids
b. archosaurs
c. lepidosaurs
d. synapsids
e. diapsids
ANSWER: d
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If all of the PCR products of a DNA sequence are 4000 bp, then the DNA sequence that was amplified must have been 8000 bp.
Answer the following statement true (T) or false (F)
Which of the following is the correct sequence of events in cross-bridge cycling?
A. Myosin cross-bridge binds to actin, the powerstroke moves the thin filament relative to the thick filament, ATP binds to myosin and cross-bridge detachment occurs, ATP is hydrolyzed and the myosin head is "cocked." B. The powerstroke moves the thin filament relative to the thick filament, myosin cross-bridge binds to actin, ATP binds to myosin and cross-bridge detachment occurs, ATP is hydrolyzed and the myosin head is "cocked." C. Myosin cross-bridge binds to actin, ATP is hydrolyzed and the myosin head is "cocked," the powerstroke moves the thin filament relative to the thick filament, ATP binds to myosin and cross-bridge detachment occurs. D. Myosin cross-bridge binds to actin, ATP binds to myosin and cross-bridge detachment occurs, the powerstroke moves the thin filament relative to the thick filament, ATP is hydrolyzed and the myosin head is "cocked." E. These events can occur in any sequence without affecting muscle function.
The sequence of changes in the species that make up a community is called ________
A) ecological succession B) pioneer progression C) climax community D) progressive adaptation
Thermoregulation depends on monitoring of blood temperature. What structure acts as the mammalian temperature sensor?
A. Peripheral blood vessels B. Thyroid C. Anterior pituitary gland D. Hypothalamus E. Adrenal medulla