Which of the following is human's closest living relative?
A. Gorillas
B. Baboons
C. Gibbons
D. Chimpanzees
Answer: D
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Why is calcium necessary for muscle contraction?
A. Calcium is needed to activate troponin so that tropomyosin can be moved to expose the myosin-binding sites on the actin filament. B. Calcium is needed to allow the muscle fiber to become depolarized. C. Calcium functions as a neurotransmitter and is released from the motor neuron. D. Calcium is needed to cock the myosin head so that it can form a cross-bridge with actin. E. Calcium is needed to detach the myosin from the actin.
The principles of linkage and recombination were discovered using which organism?
a. yeast b. E. coli c. viruses d. fruit flies
e. cattleWhich biome has a layered structure that will contain many vines and epiphytes?
a. chaparral b. tundra c. estuary d. taiga e. tropical rainforest
The genetic code uses how many nucleotide(s) to specify one amino acid.
A. one B. two C. three D. four E. 64