Virtually all chemical changes that take place in cells require ________, molecules that greatly increase the rate at which a chemical reaction occurs.
A) proteins
B) DNAs
C) Enzymes
D) carbohydrates
E) emzymes
Ans: C) Enzymes
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Considering normal human blood ranges from pH 7.35 to pH 7.45, Table 4.1 predicts that:
A. the R group of aspartate is protonated. B. the R group of glutamate is protonated. C. the R group of arginine is protonated. D. the R group of lysine is acidic. E. the R group of arginine is acidic.
Which of the following are tactile receptors? (Check all that apply.)
_____ Merkle cell _____ ampullae of Lorenzini _____ node of Ranvier _____ Meissner corpuscle _____ Ruffini corpuscle _____ rod cell _____ Pacinian corpuscle _____ free nerve ending _____ ganglion cell _____ cone cell
An example of commercial harvest is the introduction of a foreign species into an area where it is not native. Indicate whether the statement is true or false
Which of these animals has the greatest proportion of long-looped nephrons in their kidneys?
A) A saltwater fish B) A freshwater fish C) A freshwater mammal, such as a beaver D) A human E) A desert mammal, such as a sand rat