How does a chemical catalyst increase the rate of a reaction?
A. by acting as one of the reactant molecules
B. by decreasing the energy of activation
C. by increasing the energy content of the product molecules
D. by increasing the temperature of a solution
E. by phosphorylating a reactant
B
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In which type of bone tissue are osteoblasts and osteoclasts present?
A. Spongy bone B. Compact bone C. Both "spongy bone" and "compact bone" are correct.
Gladys had a stroke that has left her unable to detect certain sensations of her face. Based on this information, which region of the brain is most likely affected?
A. Frontal lobe, in middle region of the precentral gyrus B. Frontal lobe, in most inferior region of the precentral gyrus C. Parietal lobe, in the most inferior region of the postcentral gyrus D. Parietal lobe, in middle region of the postcentral gyrus
Which hepatic cells are antigen-presenting cells that can stimulate an immune response?
A) islets B) alpha cells C) hepatocytes D) Kupffer cells E) beta cells
Which of the following metaphors is most accurate in describing the psychological meaning of validity?
A. parking garage ticket B. driver's license C. dimmer light switch D. wheel chair