What is an enzyme?
A) An enzyme is a protein that increases the activation energy so more energy can be generated.
B) An enzyme is a protein that lowers the activation energy of a reaction.
C) An enzyme provides the activation energy of a reaction.
D) An enzyme is an inorganic compound.
E) An enzyme is a polymer produced by linking monomers together.
Answer: B
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A weightlifter uses muscles so the muscles exert more than 75% of their maximum
tension, This stimulates A) shrinking of skeletal muscle. B) muscle fibers developing new filaments of actin and myosin. C) an increase in slow, fatigable white fibers. D) conversion of skeletal to smooth muscle.
Biological features are the result of variation and natural selection
Indicate whether the statement is true or false
The joints of the skull are examples of ____
a. syndesmoses b. amphiarthroses c. sutures d. symphyses
What is the most likely reason humans have only two nipples?
A. Our primate ancestors probably had litters. B. The number of nipples was reduced in humans due to sexual selection. C. Primates generally have only one offspring. D. Most mammals have only two nipples. E. Having two nipples is associated with upright walking (bipedality).