In which form are electrons transferred during typical redox reactions such as the oxidation of glucose?
A. as free electrons
B. as hydrogen atoms
C. as oxygen atoms
D. as carbon atoms
E. as phosphate groups
B
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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.
Specialized molecules called _____ that help pull the new blood vessel forward during the process of angiogenesis
a. Cadherins b. Intergrins c. Proteases D. MMPs
Which of the following expresses one of the reasons why managing an international business is different from managing a purely domestic business?
a) the range of problems confronted by a manager in a domestic business is wider and the problems more complex than those confronted by a manage in an international business b) international business transactions use the euro instead of the U.S. dollar c) an international business does not need to contend with government interventions whereas a domestic business must work within the confines of its local government d) an international business must find ways to work within the limits imposed by government intervention in the international trade and investment system
One type of archaeon, Haloquadratum walsbyi, is shaped like a postage stamp with dimensions of 2 µm x 3 µm x 0.25 µm. What advantage would this shape provide?
A. This shape increases the surface to volume ratio enabling more efficient nutrient uptake. B. This shape is more conducive to the formation of biofilm communities. C. This shape is difficult for phagocytic cells to attach to and engulf. D. This shape enables this bacteria to float on surfaces and obtain better light exposure.