Sympatric speciation through polyploidy is a
frequent phenomenon in
a. insects.
b. mammals.
c. bacteria.
d. plants.
e. protists.
Answer: d
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How can humans survive if they have an inactive gene that encodes a nonfunctional myosin protein?
A. We have over 40 closely related myosin genes. B. Myosin is not essential for life. C. Myosin participates in several processes in the cell. D. Other proteins in the body can do the same thing as myosin. E. Other primates have the same nonfunctional myosin protein and survive.
Enzymes speed up a chemical reaction by ____
a. lowering the activation energy b. lowering the optimal pH c. increasing the reaction temperature d. increasing the energy in the system e. increasing the activation energy
The pilomotor response causes
a. your hair to "stand on end." b. your muscles to shiver. c. hunger. d. thirst. e. an increase in heart rate.
About a day after fertilization, the zygote undergoes ________, which is a rapid series of cell divisions
Fill in the blank(s) with correct word