Which of the following is human's closest living relative?

A. Gorillas
B. Baboons
C. Gibbons
D. Chimpanzees


Answer: D

Biology & Microbiology

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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.

Biology & Microbiology

The principles of linkage and recombination were discovered using which organism?

a. yeast b. E. coli c. viruses d. fruit flies

e. cattle

Biology & Microbiology

Which biome has a layered structure that will contain many vines and epiphytes?

a. chaparral b. tundra c. estuary d. taiga e. tropical rainforest

Biology & Microbiology

The genetic code uses how many nucleotide(s) to specify one amino acid.

A. one B. two C. three D. four E. 64

Biology & Microbiology